How do I display the content of a JavaScript object in a string format like when we alert a variable?
The same formatted way I want to display an object.
Use native JSON.stringify method.
Works with nested objects and all major browsers support this method.
str = JSON.stringify(obj);
str = JSON.stringify(obj, null, 4); // (Optional) beautiful indented output.
console.log(str); // Logs output to dev tools console.
alert(str); // Displays output using window.alert()
Link to Mozilla API Reference and other examples.
obj = JSON.parse(str); // Reverses above operation (Just in case if needed.)
Use a custom JSON.stringify replacer if you
encounter this Javascript error
"Uncaught TypeError: Converting circular structure to JSON"
If you want to print the object for debugging purposes, use the code:
var obj = {
prop1: 'prop1Value',
prop2: 'prop2Value',
child: {
childProp1: 'childProp1Value',
},
}
console.log(obj)
will display:
Note: you must only log the object. For example, this won't work:
console.log('My object : ' + obj)
Note ': You can also use a comma in the log method, then the first line of the output will be the string and after that, the object will be rendered:
console.log('My object: ', obj);
var output = '';
for (var property in object) {
output += property + ': ' + object[property]+'; ';
}
alert(output);
console.dir(object):
Displays an interactive listing of the properties of a specified JavaScript object. This listing lets you use disclosure triangles to examine the contents of child objects.
Note that the console.dir() feature is non-standard. See MDN Web Docs
Try this:
console.log(JSON.stringify(obj))
This will print the stringify version of object. So instead of [object] as an output you will get the content of object.
Well, Firefox (thanks to #Bojangles for detailed information) has Object.toSource() method which prints objects as JSON and function(){}.
That's enough for most debugging purposes, I guess.
If you want to use alert, to print your object, you can do this:
alert("myObject is " + myObject.toSource());
It should print each property and its corresponding value in string format.
If you would like to see data in tabular format you can use:
console.table(obj);
Table can be sorted if you click on the table column.
You can also select what columns to show:
console.table(obj, ['firstName', 'lastName']);
You can find more information about console.table here
Function:
var print = function(o){
var str='';
for(var p in o){
if(typeof o[p] == 'string'){
str+= p + ': ' + o[p]+'; </br>';
}else{
str+= p + ': { </br>' + print(o[p]) + '}';
}
}
return str;
}
Usage:
var myObject = {
name: 'Wilson Page',
contact: {
email: 'wilson#hotmail.com',
tel: '123456789'
}
}
$('body').append( print(myObject) );
Example:
http://jsfiddle.net/WilsonPage/6eqMn/
In NodeJS you can print an object by using util.inspect(obj). Be sure to state the depth or you'll only have a shallow print of the object.
Simply use
JSON.stringify(obj)
Example
var args_string = JSON.stringify(obj);
console.log(args_string);
Or
alert(args_string);
Also, note in javascript functions are considered as objects.
As an extra note :
Actually you can assign new property like this and access it console.log or display it in alert
foo.moo = "stackoverflow";
console.log(foo.moo);
alert(foo.moo);
To print the full object with Node.js with colors as a bonus:
console.dir(object, {depth: null, colors: true})
Colors are of course optional, 'depth: null' will print the full object.
The options don't seem to be supported in browsers.
References:
https://developer.mozilla.org/en-US/docs/Web/API/Console/dir
https://nodejs.org/api/console.html#console_console_dir_obj_options
NB:
In these examples, yourObj defines the object you want to examine.
First off my least favorite yet most utilized way of displaying an object:
This is the defacto way of showing the contents of an object
console.log(yourObj)
will produce something like :
I think the best solution is to look through the Objects Keys, and then through the Objects Values if you really want to see what the object holds...
console.log(Object.keys(yourObj));
console.log(Object.values(yourObj));
It will output something like :
(pictured above: the keys/values stored in the object)
There is also this new option if you're using ECMAScript 2016 or newer:
Object.keys(yourObj).forEach(e => console.log(`key=${e} value=${yourObj[e]}`));
This will produce neat output :
The solution mentioned in a previous answer: console.log(yourObj) displays too many parameters and is not the most user friendly way to display the data you want. That is why I recommend logging keys and then values separately.
Next up :
console.table(yourObj)
Someone in an earlier comment suggested this one, however it never worked for me. If it does work for someone else on a different browser or something, then kudos! Ill still put the code here for reference!
Will output something like this to the console :
Here's a way to do it:
console.log("%o", obj);
Use this:
console.log('print object: ' + JSON.stringify(session));
As it was said before best and most simply way i found was
var getPrintObject=function(object)
{
return JSON.stringify(object);
}
(This has been added to my library at GitHub)
Reinventing the wheel here! None of these solutions worked for my situation. So, I quickly doctored up wilsonpage's answer. This one is not for printing to screen (via console, or textfield or whatever). It does work fine in those situations and works just fine as the OP requested, for alert. Many answers here do not address using alert as the OP requested. Anyhow, It is, however, formatted for data transport. This version seems to return a very similar result as toSource(). I've not tested against JSON.stringify, but I assume this is about the same thing. This version is more like a poly-fil so that you can use it in any environment. The result of this function is a valid Javascript object declaration.
I wouldn't doubt if something like this was already on SO somewhere, but it was just shorter to make it than to spend a while searching past answers. And since this question was my top hit on google when I started searching about this; I figured putting it here might help others.
Anyhow, the result from this function will be a string representation of your object, even if your object has embedded objects and arrays, and even if those objects or arrays have even further embedded objects and arrays. (I heard you like to drink? So, I pimped your car with a cooler. And then, I pimped your cooler with a cooler. So, your cooler can drink, while your being cool.)
Arrays are stored with [] instead of {} and thus dont have key/value pairs, just values. Like regular arrays. Therefore, they get created like arrays do.
Also, all string (including key names) are quoted, this is not necessary unless those strings have special characters (like a space or a slash). But, I didn't feel like detecting this just to remove some quotes that would otherwise still work fine.
This resulting string can then be used with eval or just dumping it into a var thru string manipulation. Thus, re-creating your object again, from text.
function ObjToSource(o){
if (!o) return 'null';
var k="",na=typeof(o.length)=="undefined"?1:0,str="";
for(var p in o){
if (na) k = "'"+p+ "':";
if (typeof o[p] == "string") str += k + "'" + o[p]+"',";
else if (typeof o[p] == "object") str += k + ObjToSource(o[p])+",";
else str += k + o[p] + ",";
}
if (na) return "{"+str.slice(0,-1)+"}";
else return "["+str.slice(0,-1)+"]";
}
Let me know if I messed it all up, works fine in my testing. Also, the only way I could think of to detect type array was to check for the presence of length. Because Javascript really stores arrays as objects, I cant actually check for type array (there is no such type!). If anyone else knows a better way, I would love to hear it. Because, if your object also has a property named length then this function will mistakenly treat it as an array.
EDIT: Added check for null valued objects. Thanks Brock Adams
EDIT: Below is the fixed function to be able to print infinitely recursive objects. This does not print the same as toSource from FF because toSource will print the infinite recursion one time, where as, this function will kill it immediately. This function runs slower than the one above, so I'm adding it here instead of editing the above function, as its only needed if you plan to pass objects that link back to themselves, somewhere.
const ObjToSource=(o)=> {
if (!o) return null;
let str="",na=0,k,p;
if (typeof(o) == "object") {
if (!ObjToSource.check) ObjToSource.check = new Array();
for (k=ObjToSource.check.length;na<k;na++) if (ObjToSource.check[na]==o) return '{}';
ObjToSource.check.push(o);
}
k="",na=typeof(o.length)=="undefined"?1:0;
for(p in o){
if (na) k = "'"+p+"':";
if (typeof o[p] == "string") str += k+"'"+o[p]+"',";
else if (typeof o[p] == "object") str += k+ObjToSource(o[p])+",";
else str += k+o[p]+",";
}
if (typeof(o) == "object") ObjToSource.check.pop();
if (na) return "{"+str.slice(0,-1)+"}";
else return "["+str.slice(0,-1)+"]";
}
Test:
var test1 = new Object();
test1.foo = 1;
test1.bar = 2;
var testobject = new Object();
testobject.run = 1;
testobject.fast = null;
testobject.loop = testobject;
testobject.dup = test1;
console.log(ObjToSource(testobject));
console.log(testobject.toSource());
Result:
{'run':1,'fast':null,'loop':{},'dup':{'foo':1,'bar':2}}
({run:1, fast:null, loop:{run:1, fast:null, loop:{}, dup:{foo:1, bar:2}}, dup:{foo:1, bar:2}})
NOTE: Trying to print document.body is a terrible example. For one, FF just prints an empty object string when using toSource. And when using the function above, FF crashes on SecurityError: The operation is insecure.. And Chrome will crash on Uncaught RangeError: Maximum call stack size exceeded. Clearly, document.body was not meant to be converted to string. Because its either too large, or against security policy to access certain properties. Unless, I messed something up here, do tell!
If you would like to print the object of its full length, can use
console.log(require('util').inspect(obj, {showHidden: false, depth: null})
If you want to print the object by converting it to the string then
console.log(JSON.stringify(obj));
I needed a way to recursively print the object, which pagewil's answer provided (Thanks!). I updated it a little bit to include a way to print up to a certain level, and to add spacing so that it is properly indented based on the current level that we are in so that it is more readable.
// Recursive print of object
var print = function( o, maxLevel, level ) {
if ( typeof level == "undefined" ) {
level = 0;
}
if ( typeof level == "undefined" ) {
maxLevel = 0;
}
var str = '';
// Remove this if you don't want the pre tag, but make sure to remove
// the close pre tag on the bottom as well
if ( level == 0 ) {
str = '<pre>';
}
var levelStr = '';
for ( var x = 0; x < level; x++ ) {
levelStr += ' ';
}
if ( maxLevel != 0 && level >= maxLevel ) {
str += levelStr + '...</br>';
return str;
}
for ( var p in o ) {
if ( typeof o[p] == 'string' ) {
str += levelStr +
p + ': ' + o[p] + ' </br>';
} else {
str += levelStr +
p + ': { </br>' + print( o[p], maxLevel, level + 1 ) + levelStr + '}</br>';
}
}
// Remove this if you don't want the pre tag, but make sure to remove
// the open pre tag on the top as well
if ( level == 0 ) {
str += '</pre>';
}
return str;
};
Usage:
var pagewilsObject = {
name: 'Wilson Page',
contact: {
email: 'wilson#hotmail.com',
tel: '123456789'
}
}
// Recursive of whole object
$('body').append( print(pagewilsObject) );
// Recursive of myObject up to 1 level, will only show name
// and that there is a contact object
$('body').append( print(pagewilsObject, 1) );
You can also use ES6 template literal concept to display the content of a JavaScript object in a string format.
alert(`${JSON.stringify(obj)}`);
const obj = {
"name" : "John Doe",
"habbits": "Nothing",
};
alert(`${JSON.stringify(obj)}`);
I always use console.log("object will be: ", obj, obj1).
this way I don't need to do the workaround with stringify with JSON.
All the properties of the object will be expanded nicely.
Another way of displaying objects within the console is with JSON.stringify. Checkout the below example:
var gandalf = {
"real name": "Gandalf",
"age (est)": 11000,
"race": "Maia",
"haveRetirementPlan": true,
"aliases": [
"Greyhame",
"Stormcrow",
"Mithrandir",
"Gandalf the Grey",
"Gandalf the White"
]
};
//to console log object, we cannot use console.log("Object gandalf: " + gandalf);
console.log("Object gandalf: ");
//this will show object gandalf ONLY in Google Chrome NOT in IE
console.log(gandalf);
//this will show object gandalf IN ALL BROWSERS!
console.log(JSON.stringify(gandalf));
//this will show object gandalf IN ALL BROWSERS! with beautiful indent
console.log(JSON.stringify(gandalf, null, 4));
Javascript Function
<script type="text/javascript">
function print_r(theObj){
if(theObj.constructor == Array || theObj.constructor == Object){
document.write("<ul>")
for(var p in theObj){
if(theObj[p].constructor == Array || theObj[p].constructor == Object){
document.write("<li>["+p+"] => "+typeof(theObj)+"</li>");
document.write("<ul>")
print_r(theObj[p]);
document.write("</ul>")
} else {
document.write("<li>["+p+"] => "+theObj[p]+"</li>");
}
}
document.write("</ul>")
}
}
</script>
Printing Object
<script type="text/javascript">
print_r(JAVACRIPT_ARRAY_OR_OBJECT);
</script>
via print_r in Javascript
var list = function(object) {
for(var key in object) {
console.log(key);
}
}
where object is your object
or you can use this in chrome dev tools, "console" tab:
console.log(object);
Assume object obj = {0:'John', 1:'Foo', 2:'Bar'}
Print object's content
for (var i in obj){
console.log(obj[i], i);
}
Console output (Chrome DevTools) :
John 0
Foo 1
Bar 2
Hope that helps!
I prefer using console.table for getting clear object format, so imagine you have this object:
const obj = {name: 'Alireza', family: 'Dezfoolian', gender: 'male', netWorth: "$0"};
And you will you see a neat and readable table like this below:
Circular references solution
To make string without redundant information from object which contains duplicate references (references to same object in many places) including circular references, use JSON.stringify with replacer (presented in snippet) as follows
let s = JSON.stringify(obj, refReplacer(), 4);
function refReplacer() {
let m = new Map(), v= new Map(), init = null;
return function(field, value) {
let p= m.get(this) + (Array.isArray(this) ? `[${field}]` : '.' + field);
let isComplex= value===Object(value)
if (isComplex) m.set(value, p);
let pp = v.get(value)||'';
let path = p.replace(/undefined\.\.?/,'');
let val = pp ? `#REF:${pp[0]=='[' ? '$':'$.'}${pp}` : value;
!init ? (init=value) : (val===init ? val="#REF:$" : 0);
if(!pp && isComplex) v.set(value, path);
return val;
}
}
// ---------------
// TEST
// ---------------
// gen obj with duplicate references
let a = { a1: 1, a2: 2 };
let b = { b1: 3, b2: "4" };
let obj = { o1: { o2: a }, b, a }; // duplicate reference
a.a3 = [1,2,b]; // circular reference
b.b3 = a; // circular reference
let s = JSON.stringify(obj, refReplacer(), 4);
console.log(s);
alert(s);
This solution based on this (more info there) create JSONPath like path for each object value and if same object occurs twice (or more) it uses reference with this path to reference that object e.g. #REF:$.bar.arr[3].foo (where $ means main object) instead 'render' whole object (which is less redundant)
BONUS: inversion
function parseRefJSON(json) {
let objToPath = new Map();
let pathToObj = new Map();
let o = JSON.parse(json);
let traverse = (parent, field) => {
let obj = parent;
let path = '#REF:$';
if (field !== undefined) {
obj = parent[field];
path = objToPath.get(parent) + (Array.isArray(parent) ? `[${field}]` : `${field?'.'+field:''}`);
}
objToPath.set(obj, path);
pathToObj.set(path, obj);
let ref = pathToObj.get(obj);
if (ref) parent[field] = ref;
for (let f in obj) if (obj === Object(obj)) traverse(obj, f);
}
traverse(o);
return o;
}
// ------------
// TEST
// ------------
let s = `{
"o1": {
"o2": {
"a1": 1,
"a2": 2,
"a3": [
1,
2,
{
"b1": 3,
"b2": "4",
"b3": "#REF:$.o1.o2"
}
]
}
},
"b": "#REF:$.o1.o2.a3[2]",
"a": "#REF:$.o1.o2"
}`;
console.log('Open Chrome console to see nested fields');
let obj = parseRefJSON(s);
console.log(obj);
A little helper function I always use in my projects for simple, speedy debugging via the console.
Inspiration taken from Laravel.
/**
* #param variable mixed The var to log to the console
* #param varName string Optional, will appear as a label before the var
*/
function dd(variable, varName) {
var varNameOutput;
varName = varName || '';
varNameOutput = varName ? varName + ':' : '';
console.warn(varNameOutput, variable, ' (' + (typeof variable) + ')');
}
Usage
dd(123.55); outputs:
var obj = {field1: 'xyz', field2: 2016};
dd(obj, 'My Cool Obj');
The console.log() does a great job of debugging objects, but if you are looking to print the object to the page content, here's the simplest way that I've come up with to mimic the functionality of PHP's print_r(). A lot these other answers want to reinvent the wheel, but between JavaScript's JSON.stringify() and HTML's <pre> tag, you get exactly what you are looking for.
var obj = { name: 'The Name', contact: { email: 'thename#gmail.com', tel: '123456789' }};
$('body').append('<pre>'+JSON.stringify(obj, null, 4)+'</pre>');
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
i used pagewil's print method, and it worked very nicely.
here is my slightly extended version with (sloppy) indents and distinct prop/ob delimiters:
var print = function(obj, delp, delo, ind){
delp = delp!=null ? delp : "\t"; // property delimeter
delo = delo!=null ? delo : "\n"; // object delimeter
ind = ind!=null ? ind : " "; // indent; ind+ind geometric addition not great for deep objects
var str='';
for(var prop in obj){
if(typeof obj[prop] == 'string' || typeof obj[prop] == 'number'){
var q = typeof obj[prop] == 'string' ? "" : ""; // make this "'" to quote strings
str += ind + prop + ': ' + q + obj[prop] + q + '; ' + delp;
}else{
str += ind + prop + ': {'+ delp + print(obj[prop],delp,delo,ind+ind) + ind + '}' + delo;
}
}
return str;
};
I'm relatively new to js and now have to implement a handsontable into our project.
This worked well so far, but I am hitting a roadblock with globalization.
Basically, we use comma as a decimal seperator, but when I try and copy something like "100,2" into a cell designated as 'numeric,' it will show as 1002.
If the same value is entered in a cell designated as 'text' and the type is changed to numeric afterwards, the value will be shown correctly.
For this I already had to add 'de' culture to the table sourcecode.(basically copying 'en' and changing the values currently relevant to me.)
numeral.language('de', {
delimiters: {
thousands: '.',
decimal: ','
},//other non-relevant stuff here
When I copy the values directly from the table and insert them to np++ they show as 100.2 etc. However, when inserting them into handsontable the arguments-array looks as follows:
[Array[1], "paste", undefined, undefined, undefined, undefined]
0: Array[4]
0: 1 //row
1: 1 //column
2: "100.2" //previous value
3: 1002 //new value
Here's what I have tried currently:
hot.addHook("beforeChange", function () {
if (arguments[1] === "paste") {
hot.updateSettings({
cells: function (row, col, prop) {
var cellProperties = {
type: 'numeric',
language: 'en'
};
return cellProperties;
}
});
//hot.updateSettings({
// cells: function (row, col, prop) {
// var cellProperties = {
// type: 'text',
// };
// return cellProperties;
// }
//});
}
}, hot);
hot.addHook("afterChange", function () {
if (arguments[1] === "paste") {
ChangeMatrixSettings(); //reset cell properties of whole table
}
}, hot);
I hope I've made my problem clear enough, not sure if I missed something.
Are there any other ways to get the correct values back into the table? Is this currently not possible?
Thanks in advance.
You asked more than one thing, but let me see if I can help you.
As explained in handsontable numeric documentation, you can define a format of the cell. If you want '100,2' to be shown you would format as follows
format: '0.,'
You can change that to what you really need, like if you are looking for money value you could do something like
format: '0,0.00 $'
The other thing you asked about is not on the latest release, but you can check it out how it would work here
I have since implemented my own validation of input, due to other requirements we have for the table mainly in regards to showing invalid input to user.
function validateInputForNumeric(parameter) {
var value = parameter[3];
var row = parameter[0];
var col = parameter[1];
if (decimalSeperator === '') {
var tmpculture = getCurrCulture();
}
if (value !== null && value !== "") {
if (!value.match('([a-zA-Z])')) {
if (value.indexOf(thousandSeperator) !== -1) {
value = removeAndReplaceLast(value, thousandSeperator, ''); //Thousandseperators will be ignored
}
if (value.indexOf('.') !== -1 && decimalSeperator !== '.') {
//Since numeric variables are handled as '12.3' this will customize the variables to fit with the current culture
value = removeAndReplaceLast(value, '.', decimalSeperator);
}
//Add decimalseperator if string does not contain one
if (numDecimalPlaces > 0 && value.indexOf(decimalSeperator) === -1) {
value += decimalSeperator;
}
var index = value.indexOf(decimalSeperator)
var zerosToAdd = numDecimalPlaces - (value.length - index - 1);
for (var j = 0; j < zerosToAdd; j++) {
//Add zeros until numberOfDecimalPlaces is matched for uniformity in display values
value += '0';
}
if (index !== -1) {
if (numDecimalPlaces === 0) {
//Remove decimalseperator when there are no decimal places
value = value.substring(0, index)
} else {
//Cut values that have to many decimalplaces
value = value.substring(0, index + 1 + numDecimalPlaces);
}
}
if (ErrorsInTable.indexOf([row, col]) !== -1) {
RemoveCellFromErrorList(row, col);
}
} else {
AddCellToErrorList(row, col);
}
}
//console.log("r:" + row + " c:" + col + " v:" + value);
return value;
}
The inputParameter is an array, due to handsontable hooks using arrays for edit-events. parameter[2] is the old value, should this be needed at any point.
This code works reasonably fast even when copying 2k records from Excel (2s-4s).
One of my main hindrances regarding execution speed was me using the handsontable .getDataAtCell and .setDataAtCell methods to check. These don't seem to handle large tables very well ( not a critique, just an observation ). This was fixed by iterating through the data via .getData method.
I realize this is probably an accessibility issue that may best be left alone, but I'd like to figure out if it possible to prevent the tab from visiting the address bar in the tabbing cycle.
My application has another method of cycling through input areas, but many new users instinctively try to use the tab, and it doesn't work as expected.
Here's a generic jquery implementation where you don't have to find the max tab index. Note that this code will also work if you add or remove elements in your DOM.
$('body').on('keydown', function (e) {
var jqTarget = $(e.target);
if (e.keyCode == 9) {
var jqVisibleInputs = $(':input:visible');
var jqFirst = jqVisibleInputs.first();
var jqLast = jqVisibleInputs.last();
if (!e.shiftKey && jqTarget.is(jqLast)) {
e.preventDefault();
jqFirst.focus();
} else if (e.shiftKey && jqTarget.is(jqFirst)) {
e.preventDefault();
jqLast.focus();
}
}
});
However, you should note that the code above will work only with visible inputs. Some elements may become the document's activeElement even if they're not input so if it's your case, you should consider adding them to the $(':input:visible') selector.
I didn't add code to scroll to the focus element as this may not be the wanted behavior for everyone... if you need it, just add it after the call to focus()
You can control the tabbing order (and which elements should be able to get focus at all) with the global tabindex attribute.
However, you can't prevent users to tab into another context not under control of the page (e.g. the browser's address bar) with this attribute. (It might be possible in combination with JavaScript, though.)
For such a (evil!) use case, you'd have to look into keyboard traps.
WCAG 2.0 has the guideline: 2.1.2 No Keyboard Trap. In Understanding SC 2.1.2 you can find "Techniques and Failures" for this guideline:
F10: Failure of Success Criterion 2.1.2 and Conformance Requirement 5 due to combining multiple content formats in a way that traps users inside one format type
FLASH17: Providing keyboard access to a Flash object and avoiding a keyboard trap
G21: Ensuring that users are not trapped in content
So maybe you get some ideas by that how such a trap would be possible.
I used to add two tiny, invisible elements on tabindex 1 and on the last tabindex. Add a onFocus for these two: The element with tabindex 1 should focus the last real element, the one with the max tabindex should focus the first real element. Make sure that you focus the first real element on Dom:loaded.
You could use Javascript and capture the "keydown" event on the element with the highest "tabindex". If the user presses the "TAB" key (event.keyCode==9) without the "Shift" key (event.shiftKey == false) then simply set the focus on the element with the lowest tabindex.
You would then also need to do the same thing in reverse for the element with the lowest tabindex. Capture the "keydown" event for this element. If the user presses the "TAB" key (event.keyCode==9) WITH the "Shift" key (event.shiftKey == true) then set the focus on the element with the highest tabindex.
This would effectively prevent the address bar from ever being focused using the TAB key. I am using this technique in my current project.
Dont forget to cancel the keydown event if the proper key-combination is pressed! With JQuery it's "event.preventDefault()". In standard Javascript, I believe you simply "return false".
Here's a JQuery-laden snippet I'm using...
$('#dos-area [tabindex=' + maxTabIndex + ']').on('keydown', function (e) {
if (e.keyCode == 9 && e.shiftKey == false) {
e.preventDefault();
$('#dos-area [tabindex=1]').focus();
}
});
$('#dos-area [tabindex=1]').on('keydown', function (e) {
if (e.keyCode == 9 && e.shiftKey == true) {
e.preventDefault();
$('#dos-area [tabindex=' + maxTabIndex + ']').focus();
}
});
Also keep in mind that setting tabindex=0 has undesirable results on the order in which things are focused. I always remember (for my purposes) that tabindex is a 1-based index.
Hi i have an easy solution. just place an empty span on the end of the page. Give it an id and tabindex = 0, give this span an onfocus event, when triggered let your focus jump to the first element on your page you want to cycle trough. This way you won't lose focus on the document, because if you do your events don't work anymore.
I used m-albert solution and it works. But in my case I do not control the tabindex properties. My intention is set the focus on a toolbar at the top of the page (first control) when user leaves the last control on the page.
$(':input:visible').last().on('keydown', function (e) {
if (e.keyCode == 9 && e.shiftKey == false) {
e.preventDefault();
$('html, body').animate({
scrollTop: 0
}, 500);
$(':input:visible', context).first().focus();
}
});
Where context can be any Jquery object, selector, or even document, or you can omit it.
The scrolling animation, of course, is optional.
Not sure if this is still a issue, but I implemented my own solution that does not use jQuery, can be used in the case when all the elements have tabindex="0", and when the DOM is subject to change. I added an extra argument for a context if you want to limit the tabcycling to a specific element containing the tabindex elements.
Some brief notes on the arguments:
min must be less than or equal to max, and contextSelector is an optional string that if used should be a valid selector. If contextSelector is an invalid selector or a selector that doesn't match with any elements, then the document object is used as the context.
function PreventAddressBarTabCyle(min, max, contextSelector) {
if( isNaN(min) ) throw new Error('Invalid argument: first argument needs to be a number type.')
if( isNaN(max) ) throw new Error('Invalid argument: second argument needs to be a number type.')
if( max < min ) throw new Error('Invalid arguments: first argument needs to be less than or equal to the second argument.')
min = min |0;
max = max |0;
var isDocumentContext = typeof(contextSelector) != 'string' || contextSelector == '';
if( min == max ) {
var tabCycleListener = function(e) {
if( e.keyCode != 9 ) return;
var context = isDocumentContext ? document : document.querySelector(contextSelector);
if( !context && !('querySelectorAll' in context) ) {
context = document;
}
var tabindexElements = context.querySelectorAll('[tabindex]');
if( tabindexElements.length <= 0 ) return;
var targetIndex = -1;
for(var i = 0; i < tabindexElements.length; i++) {
if( e.target == tabindexElements[i] ) {
targetIndex = i;
break;
}
}
// Check if tabbing backward and reached first element
if( e.shiftKey == true && targetIndex == 0 ) {
e.preventDefault();
tabindexElements[tabindexElements.length-1].focus();
}
// Check if tabbing forward and reached last element
if( e.shiftKey == false && targetIndex == tabindexElements.length-1 ) {
e.preventDefault();
tabindexElements[0].focus();
}
};
} else {
var tabCycleListener = function(e) {
if( e.keyCode != 9 ) return;
var context = isDocumentContext ? document : document.querySelector(contextSelector);
if( !context && !('querySelectorAll' in context) ) {
context = document;
}
var tabindex = parseInt(e.target.getAttribute('tabindex'));
if( isNaN(tabindex) ) return;
// Check if tabbing backward and reached first element
if (e.shiftKey == true && tabindex == min) {
e.preventDefault();
context.querySelector('[tabindex="' + max + '"]').focus();
}
// Check if tabbing forward and reached last element
else if (e.shiftKey == false && tabindex == max) {
e.preventDefault();
context.querySelector('[tabindex="' + min + '"]').focus();
}
};
}
document.body.addEventListener('keydown', tabCycleListener, true);
}
More notes:
If min is equal to max, then tab cycling will occur naturally until the last element in the context is reached. If min is strictly less than max, then tabbing will cycle naturally until either the min or the max is reached. If tabbing backwards and the min is reached, or tabbing forward and the max is reached, then the tabbing will cycle to the min element or max element respectively.
Example usage:
// For all tabindex elements inside the document
PreventAddressBarTabCyle(0,0);
// Same as above
PreventAddressBarTabCyle(1,1);
// NOTE: if min == max, the tabindex value doesn't matter
// it matches all elements with the tabindex attribute
// For all tabindex elements between 1 and 15
PreventAddressBarTabCyle(1,15);
// For tabindex elements between 1 and 15 inside
// the first element that matches the selector: .some-form
PreventAddressBarTabCyle(1,15, '.some-form');
// For all tabindex elements inside the element
// that matches the selector: .some-form2
PreventAddressBarTabCyle(1,1, '.some-form2');
Salinan solution worked for me
Put this in the start of your html page:
<span tabindex="0" id="prevent-outside-tab"></span>
and this at the end of your html page.:
<span tabindex="0" onfocus="foucsFirstElement()"></span>
foucsFirstElement() :
foucsFirstElement() {
document.getElementById("prevent-outside-tab").focus();
},
My auto YUI autocomplete zindex is off. How can I force the autocomplete DIV to the top.
Below I am using a standard template for YUI:
YAHOO.util.Event.onDOMReady(function(){
YUI().use("autocomplete", "autocomplete-filters", "autocomplete-highlighters", function (Y) {
var inputNode = Y.one('#name'),
tags = [
'css',
'css3',
'douglas crockford',
'ecmascript',
'html',
'html5',
'java',
'javascript',
'json',
'node.js',
'pie',
'yui'
],
lastValue = '';
inputNode.plug(Y.Plugin.AutoComplete, {
activateFirstItem: true,
minQueryLength: 0,
queryDelay: 0,
source: tags,
resultHighlighter: 'startsWith',
resultFilters: ['startsWith']
});
// When the input node receives focus, send an empty query to display the full
// list of tag suggestions.
inputNode.on('focus', function () {
inputNode.ac.sendRequest('');
});
// When there are new AutoComplete results, check the length of the result
// list. A length of zero means the value isn't in the list, so reset it to
// the last known good value.
inputNode.ac.on('results', function (e) {
if (e.results.length) {
lastValue = inputNode.ac.get('value');
} else {
inputNode.set('value', lastValue);
}
});
// Update the last known good value after a selection is made.
inputNode.ac.after('select', function (e) {
lastValue = e.result.text;
});
});
});
Simply to put the z-index in the css. Setting via JS used to be allowed, but as of YUI 3.4.0 it's a css-only flag (https://github.com/yui/yui3/blob/master/src/autocomplete/HISTORY.md).
The relevant CSS is (adjust your z-index as necessary):
.yui3-aclist { z-index: 100; }
PS., your YAHOO. line is from YUI2, so that is quite peculiar and definitely not a standard template.
By the time your callback in the YUI().use(...) section is called, the dom should be ready. No ondomready required.