Three ways JavaScript determines whether a picture is loaded (go)

Last Update:2015-07-07 Source: Internet

Author: User

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First, the Load event

12345678910111213141516 <!DOCTYPE HTML> <meta charset="utf-8"> <title>img - load event</title><body> "img1"src="http://pic1.win4000.com/wallpaper/f/51c3bb99a21ea.jpg"> <p id="p1">loading...</p> <script type="text/javascript"> img1.onload = function() { p1.innerHTML = ‘loaded‘ } </script></body>

Test, all browsers show "loaded", indicating that all browsers support IMG's Load event.

Ii. ReadyStateChange Events

123456789101112131415161718 <!DOCTYPE HTML> <meta charset="utf-8"> <title>img - readystatechange event</title><body> "img1"src="http://pic1.win4000.com/wallpaper/f/51c3bb99a21ea.jpg"> <p id="p1">loading...</p> <script type="text/javascript"> img1.onreadystatechange = function() { if(img1.readyState=="complete"||img1.readyState=="loaded"){ p1.innerHTML = ‘readystatechange:loaded‘ } } </script></body>

ReadyState for complete and loaded indicates that the picture has been loaded. The test Ie6-ie10 supports this event and is not supported by other browsers.

Third, the Complete property of img

123456789101112131415161718192021222324 <!DOCTYPE HTML> <meta charset="utf-8"> <title>img - complete attribute</title><body> "img1"src="http://pic1.win4000.com/wallpaper/f/51c3bb99a21ea.jpg"> <p id="p1">loading...</p> <script type="text/javascript"> functionimgLoad(img, callback) { vartimer = setInterval(function() { if(img.complete) { callback(img) clearInterval(timer) } }, 50) } imgLoad(img1, function() { p1.innerHTML(‘加载完毕‘) }) </script></body>

Polling continuously monitors the complete property of IMG and, if true, indicates that the picture has been loaded and stopped polling. This property is supported by all browsers.

<!DOCTYPE HTML>

    <meta charset="utf-8">    <title>img - complete attribute</title><body>    "img1" src="http://pic1.win4000.com/wallpaper/f/51c3bb99a21ea.jpg">    <p id="p1">loading...</p>    <script type="text/javascript">        function imgLoad(img, callback) {            vartimer = setInterval(function() {                if(img.complete) {                    callback(img)                    clearInterval(timer)                }            }, 50)        }        imgLoad(img1, function() {            p1.innerHTML(‘加载完毕‘)        })    </script></body>
Three ways JavaScript determines whether a picture is loaded (go)

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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Three ways JavaScript determines whether a picture is loaded (go)

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