javascript - fullscreen not working in firefox in extjs -

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i working on full screen in chrome working in mozilla not working properly.pls it.when fullscreen icon changes n when come original screen again icon gets change not working in firefox extjs version 3.4, jquery 1.9

<script>  /*  native fullscreen javascript api ------------- assumes mozilla naming conventions instead of w3c */  (function() { var fullscreenapi = {      supportsfullscreen: false,     isfullscreen: function() { return false; },  requestfullscreen: function() {},  cancelfullscreen: function() {}, fullscreenenabled: function() {}, fullscreeneventname: '', prefix: '' }, browserprefixes = 'webkit moz o ms khtml'.split(' ');  // check native support if (typeof document.cancelfullscreen != 'undefined') { fullscreenapi.supportsfullscreen = true; } else {          // check fullscreen support vendor prefix     (var = 0, il = browserprefixes.length; < il; i++ ) {     fullscreenapi.prefix = browserprefixes[i];      if (typeof document[fullscreenapi.prefix + 'cancelfullscreen' ] != 'undefined' ) {     fullscreenapi.supportsfullscreen = true;      break;     }      } }  // update methods useful if (fullscreenapi.supportsfullscreen) {     fullscreenapi.fullscreeneventname = fullscreenapi.prefix + 'fullscreenchange';      fullscreenapi.isfullscreen = function() {     switch (this.prefix) {       case '':     return document.fullscreen;     case 'webkit':     return document.webkitisfullscreen;     case 'moz':     return document.mozisfullscreen;         default:     return document[this.prefix + 'fullscreen'];     }     }     fullscreenapi.requestfullscreen = function(el) {     return (this.prefix === '') ? el.requestfullscreen() : el[this.prefix + 'requestfullscreen']();     }     fullscreenapi.cancelfullscreen = function(el) {     return (this.prefix === '') ? document.cancelfullscreen() : document[this.prefix + 'cancelfullscreen']();     }        }  // jquery plugin if (typeof jquery != 'undefined') {     jquery.fn.requestfullscreen = function() {      return this.each(function() {     var el = jquery(this);     if (fullscreenapi.supportsfullscreen) {     fullscreenapi.requestfullscreen(el);      }     });     }; } if (typeof jquery != 'undefined') {     jquery.fn.mozrequestfullscreen = function() {      return this.each(function() {     var el = jquery(this);     if (fullscreenapi.supportsfullscreen) {     fullscreenapi.requestfullscreen(el);      }     });     }; } if (typeof jquery != 'undefined') {     jquery.fn.mozrequestfullscreen = function() {      return this.each(function() {     var el = jquery(this);     if (fullscreenapi.supportsfullscreen) {     fullscreenapi.mozrequestfullscreen(el);      }     });     }; } if (typeof jquery != 'undefined') {     jquery.fn.mozcancelfullscreen = function() {      return this.each(function() {     var el = jquery(this);     if (fullscreenapi.cancelfullscreen) {     fullscreenapi.mozcancelfullscreen(el);      }     });     }; }  // export api window.fullscreenapi = fullscreenapi;    })();  var fsbutton = document.getelementbyid('fsbutton'); if (window.fullscreenapi.supportsfullscreen) {     //fsstatus.innerhtml = 'yes: browser supports fullscreen';     //fsstatus.classname = 'fullscreensupported';      // handle button click     fsbutton.addeventlistener('click', function() {     console.log("browser supports fullscreen");     document.getelementbyid('exitscreen').style.display='block';     document.getelementbyid('fullscreen').style.display='none';     //window.fullscreenapi.requestfullscreen(fselement);     window.fullscreenapi.requestfullscreen(document.documentelement);      }, true); } else {      console.log ("sorry: browser not support fullscreen"); } var cfullscreen = document.getelementbyid('cfullscreen'); if (window.fullscreenapi.supportsfullscreen) {     //fsstatus.innerhtml = 'yes: browser supports fullscreen';     //fsstatus.classname = 'fullscreensupported';      // handle button click     cfullscreen.addeventlistener('click', function() {         //console.log("exit fullscreen");         document.getelementbyid('exitscreen').style.display='none';         document.getelementbyid('fullscreen').style.display='block';         //window.fullscreenapi.requestfullscreen(fselement);         window.fullscreenapi.cancelfullscreen(document.documentelement);      }, true);      document.documentelement.addeventlistener(fullscreenapi.fullscreeneventname, function() {     if (fullscreenapi.isfullscreen()) {         document.getelementbyid('exitscreen').style.display='block';         document.getelementbyid('fullscreen').style.display='none';         console.log("whoa, went fullscreen");     } else {         console.log("back normal");         document.getelementbyid('fullscreen').style.display='block';         document.getelementbyid('exitscreen').style.display='none';     } }, true);  } else {      console.log ("sorry: browser not support fullscreen"); }

code of html

<div id="exitscreen" style="display:none;"><a href="#"> <img src="https://cdn1.iconfinder.com/data/icons/icon_for_mealkeeper__s_soft_by_shlyapnikova/full%20screen_16.png" id="cfullscreen"/></a></div>


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