如何通过使用android webview中的js通过其ID获取特定<div>的数据?

时间:2018-08-21 18:46:07

标签: javascript android html css webview

我是网络开发的初学者,所以如果我的问题很愚蠢,请原谅。基本上,我正在使用html+css+js脚本来显示textEditor中的webView,该脚本没有任何问题,但是现在的问题是如何获取具有id“ myEditor”的特定内容?谁能帮我解决这个问题?

HTML代码:

  <html>

<head>

 <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font- 
 awesome/4.7.0/css/font-awesome.css">
</head>

 <body>
  <style>
    #editorContainer {
        max-width: 600px;
        margin: auto;
    }

    #myEditor {
        border: 1px solid #000;
        padding: 20px;
    }

    #toolbar {
        padding: 10px 20px;
        border: 1px solid #d9d9d9;
        background-color: #d9d9d9;
    }

    #toolbar button {
        border: 1px solid transparent;
        font-size: 18px;
        cursor: pointer;
        padding: 5px 10px;
        background-color: transparent;
    }

    #toolbar button:hover {
        border: 1px solid #2e2e2e;
    }
</style>
<div id="editorContainer">
    <div id="toolbar">
        <button onclick="document.execCommand('bold',true,'' )"><i class="fa fa-bold" aria-hidden="true"></i></button>
        <button onclick="document.execCommand('italic', true, '')"><i class="fa fa-italic" aria-hidden="true"></i></button>
        <button onclick="document.execCommand('underline', true, '')"><i class="fa fa-underline" aria-hidden="true"></i></button>
        <button onclick="document.execCommand('strikethrough', true, '')"><i class="fa fa-strikethrough" aria-hidden="true"></i></button>

    </div>
    <div id="myEditor" contenteditable="true">
        <h1>Simple Text Editor</h1>
        <p>This is a very simple text editor. I will add other features and design elements to it as time goes along.</p>
    </div>
</div>

<!-- Based on Codeburst.io Tutorial: https://codeburst.io/how-to-build-your-own-wysiwyg-editor-6002fa3f5ea8 -->

<!--
              Features to add:
              - Save command state
              -->
<script>
    var onclick = function() {
        var cmd = this.getAttribute('data-role');
        switch (cmd) {
            case 'h1':
            case 'h2':
            case 'p':
                document.execCommand('formatBlock', false, '<' + cmd + '>');
                break;
            default:
                document.execCommand(cmd, false, null);
                break;
        }
    };

    var els = document.querySelectorAll('#editControls a');

    Array.prototype.forEach.call(els, function(el) {
        el.addEventListener('click', onclick);
    });
</script>

现在,以下代码返回了webView的完整脚本,但我不知道如何编辑它以仅获得所需的结果。

Java代码:

webView.evaluateJavascript(
                    "(function() { return ('<html>'+document.getElementsByTagName('html')[0].innerHTML+'</html>'); })();",
                    new ValueCallback<String>() {
                        @Override
                        public void onReceiveValue(String html) {

                        }
                    });

2 个答案:

答案 0 :(得分:0)

使用Jsoup库:https://github.com/jhy/jsoup

Document document = Jsoup.parse(html);
Element sampleDiv = document.getElementById("sampleDiv");

示例:

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

public class JsoupTester {
   public static void main(String[] args) {

      String html = "<html><head><title>Sample Title</title></head>"
         + "<body>"
         + "<p>Sample Content</p>"
         + "<div id='sampleDiv'><a href='www.google.com'>Google</a>"
         + "<h3><a>Sample</a><h3>"
         +"</div>"
         + "<div id='imageDiv' class='header'><img name='google' src='google.png' />"
         + "<img name='yahoo' src='yahoo.jpg' />"
         +"</div>"
         +"</body></html>";
      Document document = Jsoup.parse(html);

      //a with href
      Elements links = document.select("a[href]");

      for (Element link : links) {
         System.out.println("Href: " + link.attr("href"));
         System.out.println("Text: " + link.text());
      }

      // img with src ending .png
      Elements pngs = document.select("img[src$=.png]");

      for (Element png : pngs) {
         System.out.println("Name: " + png.attr("name"));
      }

      // div with class=header
      Element headerDiv = document.select("div.header").first();
      System.out.println("Id: " + headerDiv.id());

      // direct a after h3
      Elements sampleLinks = document.select("h3 > a"); 

      for (Element link : sampleLinks) {
         System.out.println("Text: " + link.text());
      }
   }
}

结果:

Href: www.google.com
Text: Google
Name: google
Id: imageDiv
Text: Sample

答案 1 :(得分:0)

在您的Javascript中,document.getElementsByTagName('html')[0].innerHTML找到一个<html>标记的第一个实例,然后检索其中的HTML。由于<html>标签包含了我们的整个HTML文件,因此它将返回整个文件。

要获取ID为myEditor的特定元素的HTML,请尝试使用document.getElementById('myEditor').innerHTML,它会找到具有匹配ID属性的元素的第一个实例,并返回其innerHTML。