jQuery 和 Java 小程序 [英] jQuery and Java applets

问题描述

我正在开发一个项目，其中我们将 Java 小程序用于部分 UI(特别是地图)，但在 HTML/JavaScript 中围绕小程序构建 UI 的其余部分，通过与小程序通信LiveConnect/NPAPI.我知道这有点奇怪，但让我们假设设置不在讨论中.我开始计划使用 jQuery 作为我的 JavaScript 框架，但我遇到了两个问题.

发出第一个:

选择小程序并不提供对小程序方法的访问.

Java:

public class MyApplet extends JApplet {//...公共字符串 foo() { return "foo!";}}

JavaScript:

var applet = $("#applet-id");警报(applet.foo())；

运行上面的 JavaScript 结果

$("#applet-id").foo 不是函数

这与 Prototype 形成对比，Prototype 中类似的代码确实有效:

var applet = $("applet-id");警报(applet.foo())；

那么……applet 方法去哪儿了?

发出第二个:

Firefox 2 中的 jQuery 和小程序存在一个已知问题:http://www.pengoworks.com/workshop/jquery/bug_applet/jquery_applet_bug.htm

这是一个远景，但有人知道解决方法吗?我怀疑这个问题无法修复，这意味着要切换到 Prototype.

感谢您的帮助！

解决方案

第一个问题，试试怎么样

alert( $("#applet-id")[0].foo() );

这里的第二个问题是线程可能的解决方法.

引用解决方法

<块引用>

//防止IE内存泄漏//并防止在其他浏览器中使用鼠标悬停等事件刷新时出错//不包括窗口，以免解除现有卸载事件的绑定jQuery(window).bind("卸载",功能() {jQuery("*").add(document).unbind();});

将该代码更改为:

<块引用>

//不包含窗口，以免解除现有卸载事件的绑定jQuery(window).bind("卸载",功能() {jQuery("*:not('applet, object')").add(document).unbind();});

I'm working on a project where we're using a Java applet for part of the UI (a map, specifically), but building the rest of the UI around the applet in HTML/JavaScript, communicating with the applet through LiveConnect/NPAPI. A little bizarre, I know, but let's presume that setup is not under discussion. I started out planning on using jQuery as my JavaScript framework, but I've run into two issues.

Issue the first:

Selecting the applet doesn't provide access to the applet's methods.

Java:

public class MyApplet extends JApplet {
  // ...
  public String foo() { return "foo!"; }
}

JavaScript:

var applet = $("#applet-id");
alert(applet.foo());

Running the above JavaScript results in

$("#applet-id").foo is not a function

This is in contrast to Prototype, where the analogous code does work:

var applet = $("applet-id");
alert(applet.foo());

So...where'd the applet methods go?

Issue the second:

There's a known problem with jQuery and applets in Firefox 2: http://www.pengoworks.com/workshop/jquery/bug_applet/jquery_applet_bug.htm

It's a long shot, but does anybody know of a workaround? I suspect this problem isn't fixable, which will mean switching to Prototype.

Thanks for the help!

解决方案

For the first issue, how about trying

alert( $("#applet-id")[0].foo() );

For the second issue here is a thread with a possible workaround.

Quoting the workaround

// Prevent memory leaks in IE
// And  prevent errors on refresh with events  like mouseover in other  browsers
// Window isn't included so as not to unbind existing unload events
jQuery(window).bind("unload",
function() {
        jQuery("*").add(document).unbind();
});

change that code to:

// Window isn't included so as not to unbind existing unload events
jQuery(window).bind("unload",
function() {
        jQuery("*:not('applet, object')").add(document).unbind();
});

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