Creating breakpoints using the Polymer app-grid layout - layout

The app-grid Element (helper class)in Polymer allows to create a responsive grid layout. The given Polymer Example creates a layout with three list items placed horizontally next to each other.
To make it responsively change the grid from 3 columns to 1 on smaller screens, breakpoints have to be declared. The documentation talks about defining custom properties inside a #media rule. (Link above)
I can't get the media rules to make the change.
I found similar questions about the #media rule in Polymer but answers always pointed out to go with the iron-media-query. Now that the Polymer documentation mentions the #media I believe there must be a way to do it.
I tried using it like so but couldn't get it to work:
<style include="app-grid-style">
:host {
--app-grid-columns: 3;
--app-grid-item-height: 200px;
--app-grid-gutter: 20px;
}
#media (max-width: 600px) {
:host {
--app-grid-columns: 1;
}
}
</style>

Looking at the demos they always call this.updateStyles when the window is resized, to make sure all custom properties are applied correctly.
Unfortunately this information is missing from the docs...
attached: function() {
this._updateGridStyles = this._updateGridStyles || function() {
this.updateStyles();
}.bind(this);
window.addEventListener('resize', this._updateGridStyles);
},
detached: function() {
window.removeEventListener('resize', this._updateGridStyles);
}
If you are using app-grid outside of an element in your main document you would have to call Polymer.updateStyles() instead.

Related

Possible to add SVG ::before element and have access to stroke and fill?

Is it possible to add a before element in CSS like this:
ul {
li:before {
content: url('../icons/fancy-symbol.svg');
}
}
and have access to the svg's objects (e.g. a specific line or rectangle) and properties (e.g. the stroke-width, strike and fill color)?
Or is there a workaround for these kind of situations?
The use case is to color some lines on hover and animate the svg on click.
You can specify a fragment on the SVG URL, like ../icons/fancy-symbol.svg#red, then have CSS inside the file react to that:
<style>
#red:target ~ .some-element-here {
fill: red;
}
</style>
This won't let you specify properties dynamically, but it can be useful for interaction states, especially with a preprocessor.
Alternatively, if the SVG file is small enough, you can use preprocessors to change properties in a Data URI, like with sass-svg, or manually:
.li:before {
content: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg'
fill='#{$color}'%3E...");
}
(By the way, it might be easier to use ul { list-style-image: url(...) } instead of pseudo-elements.)

Node.JS Vash TypeError: while rendering template object is not a function

There is another thread that covers this, but I am not allowed to post to it. Also, the only answer does not seem to solve my problem.
I am getting the Object not a function error when using the #html.extend() method. I have read all of the very limited threads on this topic. They all say the same thing. That I need to ensure the path is correct to the layout.vash file I am extending. My declaration looks like this in the file that I want to want to extend with my layout.vash file.
#html.extend('layout', function (model) {
.... do stuff ...
})
What is odd, is that some pages work fine others don't. The path is correct. I am sure of this because of the fact the files in the same director exhibit different behavior.
Does anyone know what other mistake I could be making to cause this error?
In my case, vash was unable to parse the content within ...
I pulled it out from the layout page and created a separate .css file, and the annoying "object is not a function" error disappeared.
I speculate that vash collides with some css syntax.
For you info, my style statements that caused the trouble were these.
<style type="text/css">
*{padding:0;margin:0;}
html{border-top:10px #1abf89 solid;}
body{width:800px;margin:0 auto;padding:5% 20px 20px;font-family:Palatino, Optima, Georgia, serif;}
#media all and (max-width:1024px){ body, pre a{width:60%;} }
small{color:#999;}
#toolbar{margin-bottom:1em;position:fixed;left:20px;margin-top:5px;}
#toolbar [class^="icon-"]:before, #toolbar [class*=" icon-"]:before{font-family:'pen'}
#mode{color:#1abf89;;cursor:pointer;}
#mode.disabled{color:#666;}
#mode:before{content: '\e813';}
#hinted{color:#1abf89;cursor:pointer;}
#hinted.disabled{color:#666;}
#hinted:before{content: '\e816';}
#fork{position:fixed;right:0;top:0;}
/*
When the webpage is printed
this media query hides extra elements,
and makes the text content fit the page.
*/
#media print {
#fork, #toolbar {
display: none;
}
body {
width: 94%;
padding-top: 1em;
font-size: 12px;
}
html {
border-top: 0;
}
}
</style>

Google Earth Plugin, embedded in Blogger, producing 2 maps

Curious problem whilst embedding a Google Earth network link into Blogger.
The code I'm using is as shown below, but I'm getting two instances of GE on the same page, one above the other.
They must be getting generated seperately, as if I stick a border into the divs style on the page it only affects one instance.
<div id="map3d" style="border: 4px solid silver; height: 768px; width: 1024px;"></div>
However, if I remove this code from the page entirely. both instances vanish.
Other than that I've got it functioning as I'm wanting. (Eventually)
This is the code I've got in the head section
<!-- Earth -->
<script src="//www.google.com/jsapi?key=mykey"></script>
<script type="text/javascript">
var ge;
google.load("earth", "1", {"other_params":"sensor=false"});
function init() {
google.earth.createInstance('map3d', initCB, failureCB);
}
function initCB(instance) {
ge = instance;
ge.getWindow().setVisibility(true);
ge.getNavigationControl().setVisibility(ge.VISIBILITY_SHOW);
var href = 'http://urltomykmz';
google.earth.fetchKml(ge, href, function(kmlObject) {
if (kmlObject)
ge.getFeatures().appendChild(kmlObject);
if (kmlObject.getAbstractView() !== null)
ge.getView().setAbstractView(kmlObject.getAbstractView());
});
}
function failureCB(errorCode) {
}
google.setOnLoadCallback(init);
</script>
<!-- Earth -->
Grateful to anyone who can point to what's causing the second instance. Thanks.
You have to remove either the call to init() in your onload handler or the call to google.setOnLoadCallback(init), otherwise a map will be added every time you call the init function.

How to disable link to phone number when on Desktop?

How can I add a phone number to a website that is clickable but hides the link when I'm browsing on a website that doesn't support touch.
I could use Modernizr to set it up although. I don't know how.
<p><img src="assets/images/bt_calltoaction.gif" alt="View Projects" width="306" height="60"></p>
Could you just have the code in twice? i.e...
<div class="desktoptel">0800 000 000</div>
<div class="mobiletel"><a href="tel:0800-000-000">0800-000-000</div>
Then just 'display:none;' on the relevant class depending on your browser sizes?
I was just dealing with this issue, looking up solutions, and I found this thread (and a few others). I have to confess that I couldn't get any of them to work properly. I'm sure I was doing something wrong, BUT I did figure out a cheat.
As others have pointed out, changing the CSS to hide the visible link indication (color, text-decoration, cursor) is the first and easiest step. The cheat is to define a title for the tel link.
<p>Just call us at <a class="cssclassname" href="tel:18005555555"
title="CLICK TO DIAL - Mobile Only">(800) 555-5555</a>.</p>
By doing this, not only is the visible indicator of a link disguised (via CSS - see examples from others), but if someone does hover over the link, the title will pop up and say "CLICK TO DIAL - Mobile Only". That way, not only is there a better user experience, but your client doesn't accuse you of having a broken link!
For me the easiest, yet simplest method without any new classes / setup is via css:
a{
color: #3399ff;
}
a[href^="tel"]:link,
a[href^="tel"]:visited,
a[href^="tel"]:hover {
text-decoration: none;
color: #000;
pointer-events: none;
cursor: default;
}
/* Adjust px here (1024px for tablets maybe) */
#media only screen and (max-device-width: 480px) {
a[href^="tel"]:link,
a[href^="tel"]:visited,
a[href^="tel"]:hover {
text-decoration: underline;
color: #3399ff;
pointer-events: auto;
cursor: pointer;
}
}
Html just goes like this:
(+12)3 456 7
This works for modern browsers & IE 11+. If you need to include 8 < IE < 11 add the following to your javascript, since pointer-events dont work in IE:
var msie = window.navigator.userAgent.indexOf("MSIE ");
if (msie > 0){
var Elems = [], Tags = document.querySelectorAll("a[href^='tel']");
//Nodelist to array, so we're able to manipulate the elements
for (var i = 0; i < Tags.length; i++ ) {
Elems[ i ] = Tags[ i ];
}
for(var i = 0; i < Elems.length; i++){
Elems[ i ].removeAttribute('href');
}
}
EDIT: i found another answer on another thread, that may be useful for you - SO - Answer
I recently had this same problem. This problem is all over stackoverflow and everywhere else. How do you hide 'tel:' prefix and keep it from blowing up in regular browsers. There's no good single answer.
I ended up doing it this way:
first I use metalanguage to filter browser vs mobile (like php/coldfusion/perl) based on useragent string:
regular exp match for "/Android|webOS|iPhone|iPad|BlackBerry/i",CGI.HTTP_USER_AGENT
that gives me an if/else condition for desktop browser vs phone.
Next, my href tag looks like this: <a class="tel" id='tel:8005551212' href=''>800-555-1212</a>
Use CSS to style the .tel class in desktop stylesheet so it doesn't look like a link to desktop browsers. the phone number can still be clicked but its not obvious, and it wont do anything:
/* this is in default stylesheet, styles.css: */
.tel{
text-decoration:none;
color: #000;
cursor:default;
}
/* it should be re-styled in mobile css: */
.tel{
text-decoration: underline;
color: #0000CC;
cursor:auto;
}
Finally, I do a little jquery on the mobile links. The jQuery gets the id from the a.tel class, and inserts it into the href property, which makes it clickable for phone users.
The whole thing looks like this:
<!-- get regular CSS -->
<link rel="stylesheet" href="styles/styles.css" type="text/css" media="Screen" />
<!-- get user agent in meta language. and do if/else on result.
i'm not going to write that part here, other than pseudocode: -->
if( device is mobile ) {
<!-- load mobile CSS -->
<link rel="stylesheet" href="styles/mobile.css" type="text/css" media="handheld" />
<!-- run jQuery manipulation -->
<script>
$(function(){$('a.tel').prop('href',$('a.tel').prop('id'));});
</script>
}
<p> Call us today at <a class="tel" id='tel:8005551212' href=''>800-555-1212</a>!</p>
One caveat to this approach: id's should be unique. If you have duplicate phone numbers on a page that you want to link, change the id to name, then you use jQuery to loop through them.
You could use css media queries to control when its viewed as link and when not.
#media(min-width:768px){
a[href^="tel:"] {
pointer-events: none;
}
}
anything below 768px will work as link, above that, just as text.
if you just wanted to disable the click on the mobile screens:
if(typeof window.orientation !== 'undefined'){
$('a[href^="tel:"]').on('click', function(e){
e.preventDefaults();
});
}
Hope this helps :)
I've had success with this using Modernizr, specifically the touch test. It's not a perfect solution in that it doesn't do anything to help tablets or touch-enabled laptops, but it works in most desktop browsing situations.
HTML:
Call us at: 1-800-BOLOGNA
CSS:
.no-touch a.call-us {
color: black; /* use default text color */
pointer-events: none; /* prevents click event */
cursor: text; /* use text highlight cursor*/
}
The above CSS targets links with class="call-us" on non-touch devices which covers the majority of desktops.
Note that pointer-events is supported in all modern browsers but IE only supports it in versions 11+. See the compatibility chart.
Another solution, still imperfect, would be to use Modernizr.mq along with Modernizr.touch to detect screen width and touch capability and then inject the phone link with jQuery. This solution keeps the phone link out of the source code and then only appears on touch devices smaller than a certain width (say 720px which will probably cover most phones but exclude most tablets).
Ultimately, it's up to the browser vendors to come up with a bulletproof solution here.
I found the best way. I get that this is old, but I found a very easy way of doing this.
Using this code below
888-555-5555
//This is the logic you will add to the media query
.not-active {
pointer-events: none;
cursor: default;
}
In your CSS make use of media queries.
So make a media query for all desktops
#media only screen and (min-width: 64em) {
/* add the code */
.not-active {
pointer-events: none;
cursor: default;
}
}
Now all desktop sized pages wont be able to click on it.
it seems this could be done with a simple media query for most browsers. Something like this is working like a charm for me:
<style type="text/css">
#mobil-tel {
display:none;
}
#media (max-width: 700px) {
#mobil-tel {
display:block;
}
#desktop-tel{
display:none;
}
}
</style>
and on the desktop link, leave out the 'href', on the mobile link, put in the 'href'.
Just thought I would add my two-cents worth to (what is turning out to be a rather lengthy) discussion.
I basically use the onClick event (on the link) to execute Javascript to return a boolean true or false. If the return value is true, i.e. some variable or function that tests if the device is a phone returns a value true, then the href URL is followed by the browser. If the the return value is false, then the href URL becomes, in effect, inactive. (Standard HTML behavior, way before HTML5.)
Here is what I mean:-
<html>
<head>
<title>tel markup example</title>
<script src="http://code.jquery.com/jquery-2.1.0.min.js"></script> <!-- Does not really matter what version of jQuery you use -->
<script>
var probablyPhone = ((/iphone|android|ie|blackberry|fennec/).test(navigator.userAgent.toLowerCase()) && 'ontouchstart' in document.documentElement);
function initialize() {
if ( !probablyPhone ) {
alert ("Your device is probably not a phone");
( function( $ ) {
$( '.call' ).css ( "text-decoration", "none" );
$( '.call' ).css ( "color", "black" );
$( '.call' ).css ( "cursor", "default" );
} )( jQuery );
}
}
</script>
</head>
<body onLoad="initialize();">
Please ring (some fictitious number in Australia): +61 3 9111 2222
</body>
</html>
Note that I also added some re-formatting of the link to make it appear to the user as if it's just ordinary text.
Here is a gist I created.
Just to finish this post/ answer, credit for writing succinct JavaScipt code for detecting a phone (based on the user agent and the ontouchstart event) goes to a fellow Melbournian rgb in this stackoverflow post
Here is a simple jquery-based solution which I developed to solve this problem. See code comments for explanation.
https://jsfiddle.net/az96o8Ly/
// Use event delegation, to catch clicks on links that may be added by javascript at any time.
jQuery(document.documentElement).on('click', '[href^="tel:"]', function(e){
try{
// These user-agents probably support making calls natively.
if( /Android|webOS|iPhone|iPad|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ) {
// Do nothing; This device probably supports making phone calls natively...
} else {
// Extract the phone number.
var phoneNumber = jQuery(this).attr('href').replace('tel:', '').trim();
// Tell the user to call it.
alert("Please call "+phoneNumber);
// Prevent the browser popup about unknown protocol tel:
e.preventDefault();
e.stopPropagation();
}
} catch(e){
console.log("Exception when catching telephone call click!", e);
}
});
My approach is similar to another approach above; there are a few considerations I take into account:
As we know, there is no good programmatic way to detect support. This is a rare case where we are forced to parse the UserAgent string.
This should be client side; there is no need for server side detection.
There are now desktop browsers that can handle tel: links; Chrome's behavior on the desktop is, at worst, to do nothing when clicked. At best, you can make a call with Google Voice.
Because doing nothing when clicked is Chrome's fallback behavior, we should use that behavior as a fallback on all browsers.
If your page takes responsibility for creating tel: links, it should take responsibility for all tel: links and disable autodetection in the browser.
With all of this in mind, I suggest first adding a meta tag to your <head>:
<meta name="format-detection" content="telephone=no"/>
Then, define a JavaScript function that parses the UserAgent and returns true if and only if we think the browser will not bring us to an error page when the link is clicked:
function hasTelSupport()
{
return /Chrome\/|Mobile( Safari)?\/|Opera M(in|ob)i\/|w(eb)?OSBrowser\/|Mobile\;|Tablet\;/.test(navigator.userAgent);
}
Then, call that function from the onclick attribute in your link:
Call Me
This will allow tel: links to be clicked on Chrome, Edge, iOS Safari, Android Browser, Blackberry, Dorothy, Firefox Mobile, IE Mobile, Opera Mini, Opera Mobile, and webOS. The links will do nothing when clicked on other devices or browsers.
Please use international format for your tel: links. In other words, the first characters should be a + and a country code.
Thanks to TattyFromMelbourne's post I am now using a pretty simple bit:
My button id="call" will make the phone call based on his "probablyphone" test function but also will scroll down to the contact info section either way giving the button a working use no matter what.
I aslo replaced the alert with an empty function, to remove the pop-up.
<a id="call" href="#contact">PHONE US</a>
$("#call").on('click', function() {
var probablyPhone = ((/iphone|android|ie|blackberry|fennec/).test(navigator.userAgent.toLowerCase()) && 'ontouchstart' in document.documentElement);
var link = "callto:15555555555";
if ( !probablyPhone ) {
window.alert = function() {};}
else{window.location.href = link;}
});
</script>
You can use css3 media queries to detect a mobile window and hide the link accordingly.
#media(max-width:640px){
.your-calling-link{
display:none;
}
}
Alternately, if you want to show the link and just disable click functionality, use jquery function:
screen.width
or
screen.innerWidth
and disable the click functionality on the link using
$('.your-link').off(click);
One way of handling this is to create two separate divs and use display:hidden.
Example:
<div class="mobile-desktop"><p>123-456-7890</p></div>
<div class="mobile-mobile">123-456-7890</div>
In your css set your mobile break points. This part is really up to you. Let's say
#media only screen (min-width: 768px){
.mobile-mobile {
display:none;
}
}
#media only screen (max-width: 767px){
.mobile-desktop{
display:none;
}
}
This should let you hide one div based on screen size. Granted 789 is just a number I picked, so pick a size you believe is mobile. You can find them online at like this site I found on Google or others like it. Lastly, this is just a quick css markup, you might have to tinker but the idea is there.
This way works without adding any more CSS.
Try replacing the a tag with something else like a span tag, but only for mobile browsers of course. Benefits are that you are not cloaking this a with CSS preventing default action while keeping it still as a link. It won't be a anymore, so you won't have to worry.
I've created an example to here. Bold phone there works this way, see code below.
I took piece of code from one of the respondent to define if browser is mobile. And you have to mark these links with class="tel" or find a way to determine if the href has "tel:" in it. JQuery is also required.
// define if browser is mobile, usually I use Anthony's Hand mobile detection library, but here is simple detection for clarity
var probablyPhone = ((/iphone|android|ie|blackberry|fennec/).test(navigator.userAgent.toLowerCase()) && 'ontouchstart' in document.documentElement);
if ( !probablyPhone ) {
// find all the A with "tel:" in it, by class name
$('a.tel').each(function(){
var span = document.createElement('span');
// SPAN inherits properties of A, you can also add STYLE or TITLE or whatever
span.innerHTML = this.innerHTML;
span.className = this.className;
// replace A with SPAN
this.parentNode.insertBefore(span, this);
this.parentNode.removeChild(this);
});
}
Input this into custom css and call it a day:
a.tel { color: #FFFFFF; cursor: default; /* no hand pointer */ }
Change your color as needed.
Cheers!
I am adding the following css through javascript when mobile device is detected.
pointer-events:none
The js code is:
var a = document.getElementById("phone-number");
if (Platform.isMobile()) // my own mobile detection function
a.href = "tel:+1.212.555.1212";
else
$(a).css( "pointer-events", "none" );
In my target site, all phone link markups are in this pattern:
111-222-3333. My solution is such simple:
function setPhoneLink() {
if (screen.width > 640) {
$("a[href^='tel:']").each(function(){
$(this).replaceWith($(this).text());
});
}
}
Device-width: mobile<640; tablet >=768 and <1024; desk >=1024.
Source: http://javascriptkit.com/dhtmltutors/cssmediaqueries2.shtml
Don't use the screen size as a requirement for that.
You can use CSS media query like this:
#media (pointer: fine) { /* this is for devices using a mouse, maybe a pen */
a[href^="tel:"] { /* select only "tel:" links */
pointer-events: none; /* avoid clicks on this element */
}
}
#media (pointer: coarse) { /* this works for mobile phones */
}
More info: https://developer.mozilla.org/en-US/docs/Web/CSS/#media/pointer
#media screen {.telephone {pointer-events: none;}}

Isolating CSS for Chrome extension

I'm building a Chrome extension that does some UI injection using content scripts. The problem is that since every website is different and may try to screw around with the default positioning of certain elements (divs, lists) etc, my ui looks different depending on which page it is being used.
I've tried using YUI reset v3 and that helped but didn't remove all the weirdness. Does anybody know of an even more aggressive reset method that does more than just clearing margin/padding and reset text sizes?
Thanks in advance.
We've had a similar issue, we've tried CSS resets and also using specific id tags for the elements and CSS rules, but it was never robust enough...
The best solution was to inject the elements into the DOM as Shadow DOM elements that contain the style inline. You can read your CSS file via AJAX requests and inject them to the Shadow DOM dynamically, just make sure that they are within the web_accessible_resources files (you can use a wildcard to your CSS folder).
In case that you are not familiar with Shadow DOM, here is a good example of how it works. It might take a bit of re-factoring on your end, but it's really the only solution that works a 100%.
I recently created Boundary, a CSS+JS library to solve problems just like this. Boundary creates elements that are completely separate from the existing webpage's CSS.
Take creating a dialog for example. After installing Boundary, you can do this in your content script
var dialog = Boundary.createBox("yourDialogID", "yourDialogClassName");
Boundary.loadBoxCSS("#yourDialogID", "style-for-elems-in-dialog.css");
Boundary.appendToBox(
"#yourDialogID",
"<button id='submit_button'>submit</button>"
);
Boundary.find("#submit_button").click(function() {
// find() function returns a regular jQuery DOM element
// so you can do whatever you want with it.
// some js after button is clicked.
});
Elements within #yourDialogID will not be affected by the existing webpage.
Hope this helps. Please let me know if you have any question.
https://github.com/liviavinci/Boundary
meyerweb's reset styles look slightly more aggressive.
/* http://meyerweb.com/eric/tools/css/reset/
v2.0 | 20110126
License: none (public domain)
*/
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
margin: 0;
padding: 0;
border: 0;
font-size: 100%;
font: inherit;
vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
display: block;
}
body {
line-height: 1;
}
ol, ul {
list-style: none;
}
blockquote, q {
quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
content: '';
content: none;
}
table {
border-collapse: collapse;
border-spacing: 0;
}
That is why you should inject at document_end. You can do that by setting "run_at": "document_end" in the Content Script Manifest

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