[英]JavaScript: How to find out when images are turned off in browser?
想要跨瀏覽器的解決方案。
這是我的解決方案:
<script type="text/javascript">
detectImageEnabledMode({
onDetectImageIsDisabled:function(){
alert('disabled');
},
onDetectImageIsEnabled:function(){
alert('enabled');
}
});
function detectImageEnabledMode(options){
/* define disabled/enabled actions */
var actionCounter = 0;
var enabledAction = (options.onDetectImageIsEnabled && typeof(options.onDetectImageIsEnabled)=='function')?options.onDetectImageIsEnabled:function(){};
var enaledActionRun = function(){
if(actionCounter) return;
actionCounter++;
enabledAction();
}
var disabledAction = (options.onDetectImageIsDisabled && typeof(options.onDetectImageIsDisabled)=='function')?options.onDetectImageIsDisabled:function(){};
var disabledActionRun = function(){
if(actionCounter) return;
actionCounter++;
disabledAction();
}
/* create image */
var img = new Image();
var currentTime = (new Date()).getTime();
if(navigator.appName.indexOf('Microsoft Internet Explorer') != -1){// ie
img.onload = enaledActionRun;
img.onabort = enaledActionRun;
img.onerror = enaledActionRun;
img.src = currentTime+'.'+currentTime+'?time='+currentTime;
setTimeout(function(){
disabledActionRun();
}, 0);
}else if (navigator.appName.indexOf('Opera') != -1) {// opera
img.src = "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw=="+'?time='+(new Date()).getTime();
if(img.complete){
enaledActionRun();
}else{
disabledActionRun();
}
}else{// other
img.src = currentTime+'.'+currentTime+'?time='+currentTime;
if(img.complete){
disabledActionRun();
}else{
enaledActionRun();
}
}
}
// tested in: ff 2+, opera 9+, chrome, safari 4+, ie 6+
</script>
現場演示。 唯一的問題-最小異步,即:
setTimeout(function(){
disabledActionRun();
}, 0);
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