html中如何给图片添加点击事件的详解

jQuery 事件 - bind() 方法 —— 定义和用法

　　bind() 方法为被选元素添加一个或多个事件处理程序，并规定事件发生时运行的函数。

jQuery 事件 - bind() 方法 ——将事件和函数绑定到元素

　　规定向被选元素添加的一个或多个事件处理程序，以及当事件发生时运行的函数。

jQuery 事件 - bind() 方法——语法

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

jQuery 事件 - bind() 方法——参数描述

　　event 必需。规定添加到元素的一个或多个事件。由空格分隔多个事件。必须是有效的事件。

　　data 可选。规定传递到函数的额外数据。

　　function 必需。规定当事件发生时运行的函数。

实例：

//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 的img标签添加点击事件

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=''; "
	+ "for(var i=0;i<objs.length;i++) " + "{" + "imgurl+=objs[i].src+',';" + " 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 style='font-size:16px;'>" + news_title + "</h2></center>";
	data = data + "<p align='left' style='margin-left:10px'>" 
	+ "<span style='font-size:10px;'>" 
	+ news_date
	+ "</span>" 
	+ "</p>";
	data = data + "<hr size='1' />";
	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;
	}
}