从小程序调用 JS 可以在 Firefox &Chrome 但不是 Safari [英] Calling JS from an applet works in Firefox & Chrome but not Safari

问题描述

我在小程序中有以下代码来调用一些 Javascript(这有点令人费解，因为被调用的 fn 从 divId 标识的 DOM 中获取一个对象并在其上调用一个函数).

I have the following code in an applet to call some Javascript (it's a bit convoluted because the fn that's called gets an object from the DOM identified by divId and calls a function on it).

@Override
public final void start() {
  System.err.println("start() method called");
  this.javascript = JSObject.getWindow(this);
  this.jsObjectDivId = getParameter("parent_div_id");
  this.initCallbackFnName = getParameter("init_callback");
  Object args[] = {this.jsObjectDivId, this.initCallbackFnName};
  System.out.print("Calling init_callback\n");
  this.javascript.call("callJS", args);
}

callJS 函数是:

window.callJS = function(divId, functionName, jsonArgString) {
  var args, obj;
  obj = $(divId).data('neatObject');
  args = eval(jsonArgString);
  return obj[functionName](args);
};

在 Firefox/Chrome 中，divId 和 functionName 参数包含有效的字符串并且一切正常；在挂在指定 DIV 数据上的对象上调用所需的函数.

In Firefox/Chrome the divId and functionName arguments contain valid strings and everything works fine; the desired function is called on the object hanging off the specified DIV data.

在 Safari 中，divId 和 functionName 参数都报告为 JavaRuntimeObject，其值为 true.

In Safari, the divId and functionName arguments are both reported as a JavaRuntimeObject with values of true.

> divId
  JavaRuntimeObject
    true

是什么?

推荐答案

并非所有浏览器都完全支持 LiveConnect.特别是，当使用 call 时，Safari 不会将 Java 字符串转换为探测器 JS 等效项.在您的情况下，您可以在 Applet 端使用 eval 而不是 call 并放入带有参数的 JSON 字符串对象.类似的东西:

LiveConnect is not fully supported in all browsers. Especially, Safari doesn't convert Java Strings to the prober JS equivalent when using call. In your case you can just use eval at the Applet side instead of call and put in a JSON string object with the arguments. Something like:

javascript.eval(callback + "({\"id\":\"" + id + "\",\" ... })")

基本上，您需要知道有效的 LiveConnect 的跨浏览器兼容子集.我写了一篇描述子集的博客文章:http://blog.aarhusworks.com/applets-missing-information-about-liveconnect-and-deployment/

Basically, you need to know the cross-browser compatible subset of LiveConnect that works. I've written a blog post that describes the subset: http://blog.aarhusworks.com/applets-missing-information-about-liveconnect-and-deployment/

它带有在浏览器中运行的 LiveConnect 测试套件:http://www.jdams.org/live-connect-test

It comes with a LiveConnect test suite which runs in the browser: http://www.jdams.org/live-connect-test

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