jquery - Call external JS file based on "media screen" value -


i'm trying not working:

<html> <head> <script src="js/menu-collapser.js" type="text/javascript" media="media screen , (max-width: 599px)"></script> </head> ... </html>

//menu-collapser.js :

jquery(document).ready(function($){     $('.main-navigation li ul').hide();     $('.main-navigation li').has('ul').click(function() {         $(this).children().toggle();     }); });

do have idea on how in right way? script work if used directly in header tags.

you can't directly using javascript <script> tags. media queries used in linked css files or inline css styles. basic example:

<link rel="stylesheet" media="screen , (min-width: 900px)" href="desktop.css"/> <link rel="stylesheet" media="screen , (min-width: 571px)" href="tablet.css"/> <link rel="stylesheet" media="screen , (max-width: 570px)" href="mobile.css"/>

or directly in stylesheets:

@media screen , (max-width: 599px) {   #mobile {      display: block;   } }

however, can use external asset loader/media query library (require.js, modernizr.js, enquire.js , others), in case, i'm setting example using enquire.js, think it's effective , doesn't require jquery default:

full example

1) include enquire.js (available here):

<script type="text/javascript" src="/js/enquire.js"></script>

2) create load function - load js files:

<script type="text/javascript">  // loads js files in head element     function loadjs(url)     {         // adding script tag head        var head = document.getelementsbytagname('head')[0];        var script = document.createelement('script');        script.type = 'text/javascript';        script.src = url;         // fire loading        head.appendchild(script);     }  </script>

3) fire enquire.js , listen media query changes (both on-load , on-resize):

<script type="text/javascript">      enquire.register("screen , (max-width: 599px)", {         match : function() {             // load mobile js file             loadjs('mobile.js');         }     }).listen();       enquire.register("screen , (min-width: 600px) , (max-width: 899px)", {         match : function() {             // load tablet js file             loadjs('tablet.js');             //console.log('tablet loaded');         }     }).listen();       enquire.register("screen , (min-width: 900px)", {         match : function() {             // load desktop js file             loadjs('desktop.js');             //console.log('desktop loaded');         }     }).listen(); </script>


putting together

using simple html page enquire.js loaded external file:

<html> <head>  <script type="text/javascript" src="/enquire.js"></script>  <script type="text/javascript">  // loads js files in head element     function loadjs(url)     {         // adding script tag head        var head = document.getelementsbytagname('head')[0];        var script = document.createelement('script');        script.type = 'text/javascript';        script.src = url;         // fire loading        head.appendchild(script);     }  </script>  <style>      body {       font-family: arial;     }     h1 {       font-size: 50pt;     }      #mobile {       display: none;     }     #tablet {       display: none;     }     #desktop {       display: none;     }      @media screen , (max-width: 599px) {         #mobile {             display: block;         }     }      @media screen , (min-width: 600px) , (max-width: 899px) {         #tablet {             display: block;         }     }      @media screen , (min-width: 900px) {         #desktop {             display: block;         }     }     </style>  </head> <body>      <div id="desktop">         <h1>desktop</h1>     </div>      <div id="tablet">         <h1>tablet</h1>     </div>      <div id="mobile">         <h1>mobile</h1>     </div>      <script type="text/javascript">          enquire.register("screen , (max-width: 599px)", {             match : function() {                 // load js file                 loadjs('mobile.js');             }         }).listen();           enquire.register("screen , (min-width: 600px) , (max-width: 899px)", {             match : function() {                 loadjs('tablet.js');                 //console.log('tablet loaded');             }         }).listen();           enquire.register("screen , (min-width: 900px)", {             match : function() {                 loadjs('desktop.js');                 //console.log('desktop loaded');             }         }).listen();      </script> </body> </html>

in addition loading js files, create css loader too, work in same way (conditionally), defeats object of using @media in css. it's worth reading usage explanations enquire.js, can lot more i've illustrated here.

caveat: nothing above uses jquery, take advantage of of functions offers; loading scripts example - or executing other functions need to.


Comments

Post a Comment

Popular posts from this blog

monitor web browser programmatically in Android? -

i've got tricky question here. need users make payment bank (namely barclaycard) in uk. so, have https url , add parameters (such amount pay, order reference, etc) url, start http connection intent.actionview, redirect user browser can enter credit card details on bank's webpage , make payment our account successfully. far ? the code use below (i changed values privacy reasons) problem is, need app when user has completed/failed/cancelled payment. barclaycardautomatically redirects particular url when payment has succeeded, 1 if failed. there no way of knowing when barclaycard payment has succeeded go android app somehow ? button cardbutton = (button) findviewbyid(r.id.card_button); cardbutton.setonclicklistener(new view.onclicklistener() { @override public void onclick(view arg0) { string prehashstring = new string(); string prohashstring = new string(); string shapassphrase = new string(); shapassphrase = "gsvth£h70zkh...
Read more

Shrink a YouTube video to responsive width -

i have youtube video embedded on our website , when shrink screen tablet or phone sizes stops shrinking @ around 560px in width. standard youtube videos or there can add code make go smaller? you can make youtube videos responsive css. wrap iframe in div class of "videowrapper" , apply following styles: .videowrapper { float: none; clear: both; width: 100%; position: relative; padding-bottom: 56.25%; padding-top: 25px; height: 0; } .videowrapper iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; } the .videowrapper div should inside responsive element. padding on .videowrapper necessary keep video collapsing. may have tweak numbers depending upon layout.
Read more

wpf - PdfWriter.GetInstance throws System.NullReferenceException -

i'm trying create pdf document using itextsharp 5.3.4 using following document document = new document(); filestream stm = new filestream(filename, filemode.create); pdfwriter writer = pdfwriter.getinstance(document, stm); i'm getting system.nullreferenceexception following stack trace: system.nullreferenceexception occurred hresult=-2147467261 message=la référence d'objet n'est pas définie à une instance d'un objet. source=itextsharp stacktrace: à itextsharp.text.version.getinstance() innerexception: i've verified neither document nor stm null, , if select "continue" in vs12 document created - exception thrown. updated itextsharp 5.4.0 , it's still occurring. can't find information on anywhere - got ideas? make sure not catching exceptions. nullreferenceexception can 1 caught , handled inside itextsharp, don't care it. fact can continue supports theory. change following setting verify: debug -> exceptions ...
Read more