是否可以注册一个在java小程序完全加载时触发的javascript事件? [英] Is it possible to register a javascript event that triggers when java applet is fully loaded?
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问题描述
我有一个 Web 应用程序，它使用在 标签中定义的 java 小程序.是否可以添加小程序完全加载后触发的javascript事件?这是一些依赖于小程序完全加载和有效的初始化 javascript.
I have a web application that uses java applet defined in a <applet> tag. Is it possible to add a javascript event that is triggered after the applet is fully loaded? This is some initialization javascript that is dependent on that the applet is fully loaded and valid.
推荐答案
如果您没有对小程序的源代码控制，您可以在调用小程序的方法之前轮询要加载的小程序.这是我写的一个实用函数，它就是这样做的:
If you don't have source code control over the applet, you can poll for the applet to be loaded before calling methods on it. Here is a utility function I wrote that does just that:
/* Attempt to load the applet up to "X" times with a delay. If it succeeds, then execute the callback function. */
function WaitForAppletLoad(applet_id, attempts, delay, onSuccessCallback, onFailCallback) {
//Test
var to = typeof (document.getElementById(applet_id));
if (to == 'function' || to == 'object') {
onSuccessCallback(); //Go do it.
return true;
} else {
if (attempts == 0) {
onFailCallback();
return false;
} else {
//Put it back in the hopper.
setTimeout(function () {
WaitForAppletLoad(applet_id, --attempts, delay, onSuccessCallback, onFailCallback);
}, delay);
}
}
}
这样称呼它:
WaitForAppletLoad("fileapplet", 10, 2000, function () {
BuildTree("c:/");
}, function () {
alert("Sorry, unable to load the local file browser.");
});
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