This is the code which i used for window.onbeforeunload
<head>
<script>
window.onbeforeunload = func;
function func()
{
var request = new XMLHttpRequest();
request.open("POST", "exit.php", true);
request.onreadystatechange = stateChanged;
request.send(null);
}
function stateChanged()
{
if (request.readyState == 4 || request.readyState == "complete")
alert("Succes!");
}
</script>
</head>
this works with IE and Mozilla but does not work with Chrome..... please help......
thanks in advance.....
It seems that the only thing you can do with onbeforeunload in recent version of Chrome is to set the warning message.
window.onbeforeunload = function () {
return "Are you sure";
};
Will work. Other code in the function seems to be ignored by Chrome
UPDATE: As of Chrome V51, the returned string will be ignored and a default message shown instead.
Know I'm late to this, but was scratching my head why my custom beforeunload message wasn't working in Chrome and was reading this. So in case anyone else does the same, Chrome from Version 51 onwards no longer supports custom messages on beforeunload. Apparently it's because the feature has been misused by various scams. Instead you get a predefined Chrome message which may or may not suit your purposes. More details at:
https://developers.google.com/web/updates/2016/04/chrome-51-deprecations?hl=en#remove-custom-messages-in-onbeforeload-dialogs
Personally do not think the message they've chosen is a great one as it mentions leaving the site and one of the most common legitimate uses for onbeforeunload is for dirty flag processing/checking on a web form so it's not a great wording as a lot of the time the user will still be on your site, just have clicked the cancel or reload button by mistake.
You should try this:
window.onbeforeunload = function(e) {
e.returnValue = 'onbeforeunload';
return 'onbeforeunload';
};
This works on latest Chrome. We had the same issue the e.returnValue with value of onbeforeunload solved my problem.
Your code should be like this:
<head>
<script>
window.onbeforeunload = function(e) {
e.returnValue = 'onbeforeunload';
func();
return ''onbeforeunload'';
};
function func()
{
var request = new XMLHttpRequest();
request.open("POST", "exit.php", true);
request.onreadystatechange = stateChanged;
request.send(null);
}
function stateChanged()
{
if (request.readyState == 4 || request.readyState == "complete")
alert("Succes!");
}
</script>
</head>
Confirmed this behavior on chrome 21.0.1180.79
this seems to work with the same restritions as XSS, if you are refreshing the page or open a page on same domain+port the the script is executed, otherwise it will only be executed if you are returning a string (or similar) and a dialog will be shown asking the user if he wants to leans or stay in the page.
this is an incredible stupid thing to do, because onunload/onbeforeunload are not only used to ask/prevent page changes.
In my case i was using it too save some changes done during page edition and i dont want to prevent the user from changing the page (at least chrome should respect a returning true or change the page without the asking if the return is not a string), script running time restrictions would be enought.
This is specially annoying in chrome because onblur event is not sent to editing elements when unloading a page, chrome simply igores the curent page and jumps to another. So the only change of saving the changes was the unload process and it now can't be done without the STUPID question if the user wants to change it... of course he wants and I didnt want to prevent that...
hope chrome resolves this in a more elegant way soon.
Try this, it worked for me:
window.onbeforeunload = function(event) {
event.returnValue = "Write something clever here..";
};
Try this. I've tried it and it works. Interesting but the Succes message doesn`t need confirmation like the other message.
window.onbeforeunload = function()
{
if ( window.XMLHttpRequest )
{
console.log("before"); //alert("before");
var request = new XMLHttpRequest();
request.open("POST", "exit.php", true);
request.onreadystatechange = function () {
if ( request.readyState == 4 && request.status == 200 )
{
console.log("Succes!"); //alert("Succes!");
}
};
request.send();
}
}
None of the above worked for me. I was sending a message from the content script -> background script in the before unload event function. What did work was when I set persistent to true (in fact you can just remove the line altogether) in the manifest:
"background": {
"scripts": [
"background.js"
],
"persistent": true
},
The logic is explained at this SO question here.
Current versions of Chrome require setting the event's returnValue property. Simply returning a string from the event handler won't trigger the alert.
addEventListener('beforeunload', function(event) {
event.returnValue = 'You have unsaved changes.';
});
I'm running Chrome on MacOS High Sierra and have an Angular 6 project whithin I handle the window.beforeunload an window.onbeforeunload events. You can do that, it's worked for me :
handleUnload(event) {
// Chrome
event.returnValue = true;
}
It show me an error when I try to put a string in event.returnValue, it want a boolean.
Don't know if it allows custom messages to display on the browser.
<script type="text/javascript">
window.addEventListener("beforeunload", function(e) {
e.preventDefault(); // firefox
e.returnValue = ''; // Chrome
});
</script>
Related
I know similar questions have been asked here before, but I didn't find an answer that helped me. Sorry for that! I'm probably just too inexperienced to understand those answers, so please bear with me.
I have written a Google Apps Script that scans a specific Spreadsheet (not authored by me, but I can view) and counts certain fields. The doGet(e) function returns the count, so when I run the published-as-web-app I see a number.
Now from my background.js in my chrome extension I did something like this:
var my_app = "https://script.google.com/a/macros/google.com/s/.../exec?param=value";
var xhr = new XMLHttpRequest();
try {
xhr.open("GET", my_app);
xhr.send(null);
var result = xhr.getAllResponseHeaders();
localStorage.count = result;
chrome.browserAction.setBadgeText({text: localStorage.count});
} catch(e)
...
}
This is very rough, since I'm very new to JavaScript and Chrome Extensions and such.
I'm guessing getAllResponseHeaders() is not how I get to the resulting number that is displayed when calling my_app, so what should I use instead? In the API reference for XMLHttpRequest I didn't find anything obvious.
I'm pretty sure there's a lot more wrong with my code, but let's go one step at a time.
Thanks already in advance! Detailed answers would be great, so I can follow them and extend my currently very limited knowledge.
If you are making an HTTP Request from client side JavaScript to Apps Script, then you can use something like this:
function requestToAppsScript() {
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
} else { // code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function() {
//console.log('xmlhttp.readyState: ' + xmlhttp.readyState);
if (xmlhttp.readyState===4 && xmlhttp.status===200) {
//console.log('xmlhttp.responseText: ' + xmlhttp.responseText);
var theReturnData = xmlhttp.responseText;
//console.log('return value: ' + theReturnData);
};
};
xmlhttp.open("GET","URL here",true);
xmlhttp.send();
};
basically I just didn't parse the output right. The output I received contained a lot of things and the number I was looking for was hidden in that mess of a string, always behind some string called "cajaHtml".
Therefore the call is now:
xhr.open("GET", my_app);
xhr.onreadystatechange = handleResponse;
xhr.responseType = "text";
xhr.send(null);
with
function handleResponse() {
if (xhr.readyState == 4) {
var result = xhr.responseText.split("cajaHtml")[1];
}
}
Thanks!
How to identify a tab is reloading, I mean actual page reload?
I see chrome.tabs.onUpdated event, but for this event status is 'loading' even in case of AJAX calls from a webpage.
How can I detect a page is getting reloaded ?
You are right, looks like not possible to recognize AJAX and page reload calls. As workaround you could listen for onunload event for tab webpage. You probably need to check if tabid and url were not changed after that.
But do you really need to know if page reloaded?
It's an old question, but here is my solution that could be in help (without AIAX).
Since the method 'chrome.tabs.get()' return a promise, you can use the 'callback function' to check the current 'tab.status'.
Setting a boolean variable 'waitingForComplete = true', you will run your code, only when the tab will return at status = 'complete'.
background.js
var waitingForComplete = false;
chrome.tabs.onUpdated.addListener((tabId. changeInfo,tab) => {
if(changeInfo.status == 'complete'){
if(waitingForComplete){
waitingForComplete = false;
// runYourCode...
}
}
};
function checkTabStatusComplete(tabId){
chrome.tabs.get(tabId. function(tab){
if(tab.status == 'complete'){
// runYourCode...
} else {
waitingForComplete = true;
}
}
};
Hi I have try to realize that...but I have some problem with CKeditor control:
autosave function in Ajax mode
With Firebug I see the POST sending for a simple field (text for example) but the post of CKEDITOR is not correct (I see only the initial value when I open the XPages)
have anyone any idea?
P.S. I have add this code into the onstart function:
for(var instanceName in CKEDITOR.instances) {
CKEDITOR.instances[instanceName].updateElement();
}
Now I see the POST with correct HTML...don't seem work
Ok I have resolve the problematic I have insert this native RichText code in top of my XPages:
function CKEDITOResubmit(idCKEDITOR){
var rte=dijit.byId(idCKEDITOR);
var txta=XSP.getElementById(idCKEDITOR+'_h');
if(!rte || !txta) return;
txta.value = rte.getValue();
var mod=XSP.getElementById(idCKEDITOR+'_mod');
mod.value=rte.isModified(txta.value);
return true;
}
When start automatic routine of Update:
executeOnServer('autoSaveDoc',null,
{'valmode': 1,
onStart:function() {
for(var instanceName in CKEDITOR.instances) {
CKEDITOResubmit(instanceName)
}
btn.innerHTML="saving....";console.log("autosave start"); },
onComplete:function() {btn.innerHTML="saved!"; console.log("autosave complete")},
onError: function() {btn.innerHTML="error saving"; console.log("autosave error") }
})
I'm not good at JS and I'm having some -I hope- stupid problem I'm not seeing on my code... if you guys could help me out, I'd really appreciate it.
My extension does some stuff with the current tab's URL. It worked ok using the onUpdate event on my background page, setting the tab's URL on a variable and then I used it on a pop-up.
The thing is that if the user starts, selecting different tabs, without updating the URLs my event won't be triggered again... so I'm now also listening to the onSelectionChanged event.
The thing is that there's no "tab" object within the onSelectionChanged event's parameters, so I cannot ask for the tab.url property.
I tried to use the chrome.tabs.getCurrent() method, but obviously I'm doing something wrong... and I reached the limit of my -very little- knowledge.
Here's the code, if you guys could take a look and point me in the right direction, I'll really appreciate it.
<script>
var tabURL = '';
var defaultURLRecognition = [ "test" ];
// Called when the url of a tab changes.
function checkForValidUrl(tabId, changeInfo, tab) {
//THIS IS WHAT'S NOT WORKING, I SUPPOSE
if (tab==undefined) {
chrome.tabs.getCurrent(function(tabAux) {
test = tabAux;
});
}
//
// If there's no URLRecognition value, I set the default one
if (localStorage["URLRecognition"]==undefined) {
localStorage["URLRecognition"] = defaultURLRecognition;
};
// Look for URLRecognition value within the tab's URL
if (tab.url.indexOf(localStorage["URLRecognition"]) > -1) {
// ... show the page action.
chrome.pageAction.show(tabId);
tabURL = tab.url;
}
};
// Listen for any changes to the URL of any tab.
chrome.tabs.onUpdated.addListener(checkForValidUrl);
// Listen for tab selection changes
chrome.tabs.onSelectionChanged.addListener(checkForValidUrl);
</script>
I would do something like this:
function checkForValidUrl(tab) {
//...
}
chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab){
if(changeInfo.status == "loading") {
checkForValidUrl(tab);
}
});
chrome.tabs.onSelectionChanged.addListener(function(tabId, selectInfo){
chrome.tabs.getSelected(null, function(tab){
checkForValidUrl(tab);
});
});
I need to show an "Exit" popup window in MOSS pages. How can I achieve this?
Setup a javascript include for jQuery
Setup a javascript include file with this code:
var doPopup = true;
$(document).ready(function() {
$('a').click(function() { doPopup = false; });
$('form').submit(function() { doPopup = false; });
});
$(window).unload(function() { onUnloadPopup(); });
function onUnloadPopup() {
if (doPopup) {// do your window.open here }
}
What it does is run the onUnloadPopup everytime the page is exited without clicking either a link or submitting a form. That function can open your exit popup. Be prepared for a lot of issues though. Exit popups are not liked much, browsers will block them and with something as complex as SharePoint you might get some unexpected occurrences..