知道何时在 UIWebView 中加载了 AJAX [英] Knowing when AJAX has loaded in UIWebView

问题描述

我有一个 UIWebView 并且一个页面有一个 AJAX 组件，当用户单击按钮时，它的内容会发生变化.我如何知道内容何时加载到 UIWebView 中?

I have a UIWebView and one page has an AJAX component whose content changes when the user clicks a button. How can I know when the content has loaded inside the UIWebView?

推荐答案

你需要做两件事:

1. 在您的 JavaScript 代码中，使用 XMLHTTPRequest 信号表明 AJAX 请求已通过自定义 URL 完成:

1. In your JavaScript code, have the XMLHTTPRequest signal that the AJAX request is complete with a custom URL:

var req = new XMLHttpRequest();  
req.open('GET', 'http://www.mozilla.org/', true);  
req.onreadystatechange = function (aEvt) {  
  if (req.readyState == 4) {  
     if(req.status == 200) { 
       window.location = "myspecialurl:foo"
     }
  }  
};  

在您的本机代码中，您需要实现一个 UIWebView 委托来侦听此自定义 URL:

In your native code, you'll need to implement a UIWebView delegate that listens for this custom URL:

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType 
{
  if([[[request URL] absoluteString] isEqualToString:@"myspecialurl:foo"]) {
     // Your code for when the AJAX request completes.
     return NO;
  }
  return YES;
}

不保证此代码可以解析/编译，但应该让您知道如何去做.

No assurances this code parses/compiles but should give you the idea how to do it.

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