Detailed explanation of how to add click events to images in html

First use the jQuery selector to get the img element that you want to bind the click event to, and then you can bind the click method directly or bind it through the bind method. Here is a detailed introduction to the bind method.

jQuery event - bind() method - Definition and usage

The bind() method adds one or more event handlers to the selected element and specifies the event Function to run when this occurs.

jQuery Events - bind() method - Bind events and functions to elements

Specifies one or more event handlers to add to the selected element and run when the event occurs The function.

jQuery event - bind() method - syntax

　　$(selector).bind(event,data,function)

jQuery event - bind() method - parameter description

Event Required. Specifies one or more events to be added to the element. Multiple events separated by spaces. Must be a valid event.

Data is optional. Specifies additional data to be passed to the function.

Function Required. Specifies a function to run when an event occurs.

Example:

//直接给所有img标签绑定click事件
$("img").click(function(){
   alert('你点击了图片');
})
 
//使用bind方法绑定click事件
$("img").bind("click",function(){
   alert('你点击了图片');
})

Html's img tag adds a click event

package com.topnews;

import java.util.ArrayList;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Fragment;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.webkit.WebSettings.LayoutAlgorithm;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.ProgressBar;
import android.widget.TextView;

import com.topnews.base.BaseActivity;
import com.topnews.bean.NewsEntity;
import com.topnews.service.NewsDetailsService;
import com.topnews.tool.BaseTools;
import com.topnews.tool.DataTools;
import com.topnews.tool.DateTools;

@SuppressLint("JavascriptInterface")
public class DetailsActivity extends BaseActivity {
	private TextView title;
	private ProgressBar progressBar;
	private FrameLayout customview_layout;
	private String news_url;
	private String news_title;
	private String news_source;
	private String news_date;
	private NewsEntity news;
	private TextView action_comment_count;
	WebView webView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.details);
		setNeedBackGesture(true);// 设置需要手势监听
		getData();
		initView();
		initWebView();
	}

	/* 获取传递过来的数据 */
	private void getData() {
		news = (NewsEntity) getIntent().getSerializableExtra("news");
		news_url = news.getSource_url();
		news_title = news.getTitle();
		news_source = news.getSource();
		news_date = DateTools.getNewsDetailsDate(String.valueOf(news.getPublishTime()));
	}

	private void initWebView() {
		webView = (WebView) findViewById(R.id.wb_details);
		LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
		if (!TextUtils.isEmpty(news_url)) {
			WebSettings settings = webView.getSettings();
			settings.setJavaScriptEnabled(true);// 设置可以运行JS脚本
			// settings.setTextZoom(120);//Sets the text zoom of the page in
			// percent. The default is 100.
			settings.setLayoutAlgorithm(LayoutAlgorithm.SINGLE_COLUMN);
			// settings.setUseWideViewPort(true); //打开页面时， 自适应屏幕
			// settings.setLoadWithOverviewMode(true);//打开页面时， 自适应屏幕
			settings.setSupportZoom(false);// 用于设置webview放大
			settings.setBuiltInZoomControls(false);
			webView.setBackgroundResource(R.color.transparent);
			// 添加js交互接口类，并起别名 imagelistner
			webView.addJavascriptInterface(new JavascriptInterface(getApplicationContext()), "imagelistner");
			webView.setWebChromeClient(new MyWebChromeClient());
			webView.setWebViewClient(new MyWebViewClient());
			Log.i("info", "news_url:" + news_url);
			Log.i("info", "news_title:" + news_title);
			Log.i("info", "news_source:" + news_source);
			Log.i("info", "news_date:" + news_date);
			new MyAsnycTask().execute(news_url, news_title, news_source + " " + news_date);
		}
	}

	private void initView() {
		title = (TextView) findViewById(R.id.title);
		progressBar = (ProgressBar) findViewById(R.id.ss_htmlprogessbar);
		customview_layout = (FrameLayout) findViewById(R.id.customview_layout);
		// 底部栏目
		action_comment_count = (TextView) findViewById(R.id.action_comment_count);

		progressBar.setVisibility(View.VISIBLE);
		title.setTextSize(13);
		title.setVisibility(View.VISIBLE);
		title.setText(news_url);
		action_comment_count.setText(String.valueOf(news.getCommentNum()));
	}

	@Override
	public void onBackPressed() {
		super.onBackPressed();
		overridePendingTransition(R.anim.slide_in_left, R.anim.slide_out_right);
	}

	private class MyAsnycTask extends AsyncTask<String, String, String> {

		@Override
		protected String doInBackground(String... urls) {
			String data = NewsDetailsService.getNewsDetails(urls[0], urls[1], urls[2]);
			Log.i("info", "MyAsnycTask.data:" + data);
			return data;
		}

		@Override
		protected void onPostExecute(String data) {
			webView.loadDataWithBaseURL(null, data, "text/html", "utf-8", null);
		}
	}

	// 注入js函数监听
	private void addImageClickListner() {
		// 这段js函数的功能就是，遍历所有的img几点，并添加onclick函数，在还是执行的时候调用本地接口传递url过去
		webView.loadUrl("javascript:(function(){" + "var objs = document.getElementsByTagName(\"img\");" + "var imgurl=&#39;&#39;; "
				+ "for(var i=0;i<objs.length;i++)  " + "{" + "imgurl+=objs[i].src+&#39;,&#39;;" + "    objs[i].onclick=function()  " + "    {  "
				+ "        window.imagelistner.openImage(imgurl);  " + "    }  " + "}" + "})()");
	}

	// js通信接口
	public class JavascriptInterface {

		private Context context;

		public JavascriptInterface(Context context) {
			this.context = context;
		}

		public void openImage(String img) {

			//
			String[] imgs = img.split(",");
			ArrayList<String> imgsUrl = new ArrayList<String>();
			for (String s : imgs) {
				imgsUrl.add(s);
				Log.i("图片的URL>>>>>>>>>>>>>>>>>>>>>>>", s);
			}
			Intent intent = new Intent();
			intent.putStringArrayListExtra("infos", imgsUrl);
			intent.setClass(context, ImageShowActivity.class);
			intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
			context.startActivity(intent);
		}
	}

	// 监听
	private class MyWebViewClient extends WebViewClient {
		@Override
		public boolean shouldOverrideUrlLoading(WebView view, String url) {
			return super.shouldOverrideUrlLoading(view, url);
		}

		@Override
		public void onPageFinished(WebView view, String url) {
			view.getSettings().setJavaScriptEnabled(true);
			super.onPageFinished(view, url);
			// html加载完成之后，添加监听图片的点击js函数
			addImageClickListner();
			progressBar.setVisibility(View.GONE);
			webView.setVisibility(View.VISIBLE);
		}

		@Override
		public void onPageStarted(WebView view, String url, Bitmap favicon) {
			view.getSettings().setJavaScriptEnabled(true);
			super.onPageStarted(view, url, favicon);
		}

		@Override
		public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
			progressBar.setVisibility(View.GONE);
			super.onReceivedError(view, errorCode, description, failingUrl);
		}
	}

	private class MyWebChromeClient extends WebChromeClient {
		@Override
		public void onProgressChanged(WebView view, int newProgress) {
			// TODO Auto-generated method stub
			if (newProgress != 100) {
				progressBar.setProgress(newProgress);
			}
			super.onProgressChanged(view, newProgress);
		}
	}
}

// NewsDetailsService.java

package com.topnews.service;

import java.io.IOException;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;

import android.text.TextUtils;

public class NewsDetailsService {
	public static String getNewsDetails(String url, String news_title,
			String news_date) {
		Document document = null;
		String data = "<body>" +
				"<center><h2 id="nbsp-nbsp-news-title-nbsp-nbsp">" + news_title + "</h2></center>";
		data = data + "<p align=&#39;left&#39; style=&#39;margin-left:10px&#39;>" 
				+ "<span style=&#39;font-size:10px;&#39;>" 
				+ news_date
				+ "</span>" 
				+ "</p>";
		data = data + "<hr size=&#39;1&#39; />";
		try {
			document = Jsoup.connect(url).timeout(9000).get();
			Element element = null;
			if (TextUtils.isEmpty(url)) {
				data = "";
				element = document.getElementById("memberArea");
			} else {
				element = document.getElementById("artibody");
			}
			if (element != null) {
				data = data + element.toString();
			}
			data = data + "</body>";
		} catch (IOException e) {
			e.printStackTrace();
		}
		return data;
	}
}

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