Android Webview JavaScript无法在API 18或更高版本上运行 [英] Android webview javascript not working on API 18 or higher

问题描述

我想在WebView中显示一个带有某些DOM元素的网站.我的意思是，我想删除一个特殊的div元素或将其替换为某些东西. 为此，我做了这样的事情: 要替换某些内容，我使用此模型

I want to display a website in WebView with manipulating some DOM element. I mean, I want to remove a special div element or replace it with something. For this purpose I did something like this: For replacing something I use this model

document.getElementById("demo").innerHTML = "Hello World!";

我将其应用于Android WebView，如下所示:

I apply it for Android WebView like this:

public class WebClient extends WebViewClient {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        return true;
    }
    @Override
    public void onPageFinished(WebView view, final String url) {
             view.loadUrl("javascript:document.getElementById(\"jumbotron-company\").innerHTML = \"\";");
    }
}

在我的API为18的设备上可以使用，但在模拟器或API大于18的设备上不能使用

It is work on my device which API is 18 but not working on emulators or device which have API greater than 18

推荐答案

@Mattia所说的正确.如果可能，使用evaluateJavascript.另一个优点是能够从JavaScript返回结果的值.

What @Mattia said is correct. Use evaluateJavascript if possible. It has another advantage of being able to return the value of the result back from JavaScript.

但是，如果要使用与API无关的解决方法，请确保使用loadUrl("javascript:...")评估的代码不会产生任何返回值.分配返回分配的值.在较新版本的WebView中，此值用作替换现有页面的新页面的内容.

But if you want an API-agnostic workaround, make sure that the code you evaluate using loadUrl("javascript:...") just doesn't produce any return value. An assignment returns the assigned value. In newer versions of WebView this value is used as contents for a new page that replaces the existing one.

您可以通过两种方式确保所评估的表达式不会产生返回值:

You can make sure that the expression you are evaluating doesn't produce a return value in two ways:

• 在末尾附加void(0);语句，例如loadUrl("javascript:elt.innerHTML='Hello World!';void(0);");

在不返回值的函数中运行代码，例如loadUrl("(function(){elt.innerHTML='Hello World!';})()");

run your code inside a function that doesn't return a value, e.g. loadUrl("(function(){elt.innerHTML='Hello World!';})()");

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