网上有大量的jQuery自动补全功能的插件，我实现这个功能是采用网友写好的纯jQuery代码，而不是采用插件，因为特效会差很多。而后台的数据是从solr那边获取过来，通过整理，放到对象中，再放到集合中，然后在servlet层解开，生成xml文件，返回到前台，形成自动提示补全的功能，流程非常简单，没有采用框架技术，只是用了JSP的servlet来做中间层而已。
目录结构如下：
1.先编写实体类src\com\lifeix\entity\Word.java
package com.lifeix.entity;
/**
* Created by lhx on 14-12-9 上午9:38
*
* @project jspProject
* @package com.lifeix.entity
* @blog http://blog.csdn.net/u011439289
* @email [email protected]
* @Description
*/
public class Word {
//次数
private int number ;
//名称
private String name ;
public Word(){}
public Word(int number, String name){
this.number = number ;
this.name = name ;
}
public int getNumber() {
return number;
}
public void setNumber(int number) {
this.number = number;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
2.编写一个servlet测试一下src\com\lifeix\servlet\AutoCompleteServlet.java
package com.lifeix.servlet;
import com.lifeix.entity.Word;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* Created by lhx on 14-12-9 上午9:31
*
* @project jspProject
* @package ${PACKAGE_NAME}
* @blog http://blog.csdn.net/u011439289
* @email [email protected]
* @Description
*/
public class AutoCompleteServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
StringBuffer sf = new StringBuffer("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
sf.append("<message>");
List<Word> list = new ArrayList<Word>(10);
Word word = null ;
for (int i = 0; i < 10; i++) {
word = new Word(i, "abd" + i);
list.add(word);
}
Iterator<Word> it = list.iterator();
while (it.hasNext()){
Word word1 = it.next();
if (word1 == null){
continue;
}
int number = word1.getNumber();
String name = word1.getName();
sf.append("<word>"+name);
sf.append("</word>");
}
sf.append("</message>");
PrintWriter pw = null;
try {
response.setContentType("text/xml;charset=utf-8");
response.setCharacterEncoding("UTF-8");
response.setHeader("Cache-Control", "no-cache");
pw = response.getWriter();
pw.print(sf.toString());
pw.flush();
}catch (Exception e) {
e.printStackTrace();
}
finally {
if (pw != null)
pw.close();
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request,response);
}
}
启动tomcat，访问这个servlet，结果如下：
证明返回的确实是XML文档。
3.直接编写页面文档jspProject\web\auto2.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jQuery 自动完成功能(优化版)</title>
<script type="text/javascript" src="js/jquery-2.1.1.js"></script>
</head>
<body>
<script type="text/javascript">
var highlightindex = -1;//表示当前高亮节点
var timeoutId;
$(document).ready(function() {
var wordInput = $("#word");//文本框
var wordInputOffset = wordInput.offset();//获得文本框位置
$("#auto").hide().css("border", "1px black solid").css("position", "absolute")
.css("top", wordInputOffset.top + wordInput.height() + 5 + "px")
.css("left", wordInputOffset.left + "px").width(wordInput.width() + 3 + "px");
wordInput.keyup(function(event) {
//处理文本框中的键盘事件
//如果输入字母，将文本框中最新信息发送给服务器
var myEvent = event || window.event;
var keyCode = myEvent.keyCode;//获得键值
if (keyCode == 27) {
var wordText = $("#word").val();
autoHide();
wordInput.text(wordText);
}
else {
if (keyCode >= 65 && keyCode <= 90 || keyCode == 8 || keyCode == 46) { //8对应退格键，46对应删除键
var wordText = $("#word").val();//获得文本框中的内容
var autoNode = $("#auto");
if (wordText != "") {
clearTimeout(timeoutId);//对上次未完成的延时操作进行取消
//延时操作，减少与服务器的交互次数，延时500ms，防止用户操作过快
timeoutId = setTimeout(function() {
$.post("AutoCompleteServlet", {word:wordText}, function(data) {//发送数据，第二项是属性名对应属性值
var jqueryObj = $(data);//将dom对象data转换成jQuery的对象
var wordNodes = jqueryObj.find("word");//找到所有word节点
autoNode.html("");
wordNodes.each(function(i) { //i是索引，用来给id赋值
var wordNode = $(this);//获取单词内容
var newDivNode = $("<div>").attr("id", i).css("backgroundColor", "white");
newDivNode.html(wordNode.text()).appendTo(autoNode);//新建div节点，加入单词内容
//增加鼠标进入事件，高亮节点
newDivNode.mouseover(function() {
//将原来高亮的节点取消高亮
if (highlightindex != -1) {
$("#auto").children("div").eq(highlightindex)
.css("backgroundColor", "white");
}
//记录新的高亮索引
highlightindex = $(this).attr("id");
$(this).css("backgroundColor", "#3366CC").css("cursor","pointer");
});
//增加鼠标移出事件，取消节点高亮
newDivNode.mouseout(function() {
if (keyCode == 13) { //判断是否按下回车键
//下拉框有高亮
if (highlightindex != -1) {
lightEventHide();
highlightindex = -1;
} else {
alert("文本框中的[" + $("#word").val() + "]被提交了");
autoHide();
$("#word").get(0).blur();//让文本框失去焦点
}
//取消鼠标移出节点的高亮
//$(this).css("backgroundColor", "white");
}
}
);
//增加鼠标点击事件,可以进行补全
newDivNode.click(function() {
//取出高亮节点的文本内容
var comText = $(this).text();
autoHide();
highlightindex = -1;
//文本框内容变为高亮节点内容
$("#word").val(comText);
});
});
//添加单词内容到弹出框
if (wordNodes.length > 0) {
autoNode.show();
} else {
autoNode.hide();
highlightindex = -1;//弹出框隐藏，高亮节点索引设成-1
}
}, "xml");
}, 300);
}
else
{
autoNode.hide();
highlightindex = -1;
}
} else if (keyCode == 38 || keyCode == 40) { //判断是否输入的是向上38向下40按键
if (keyCode == 38) {
var autoNodes = $("#auto").children("div").css("background-color", "white");
if (highlightindex != -1) {
autoNodes.eq(highlightindex).css("background-color", "white");
highlightindex--;
} else {
lightEvent();
highlightindex = autoNodes.length - 1;
}
if (highlightindex == -1) {
highlightindex = autoNodes.length - 1;//如果改变索引值后index变成-1，则将索引值指向最后一个元素
}
lightEvent();
autoNodes.eq(highlightindex).css("backgroundColor", "#3366CC");
}
if (keyCode == 40) {
var autoNodes = $("#auto").children("div");
if (highlightindex != -1) {
autoNodes.eq(highlightindex).css("background-color", "white");
}
highlightindex++;
if (highlightindex == autoNodes.length) {
highlightindex = 0;//如果改变索引值等于最大长度，则将索引值指向第一个元素
}
lightEvent();
autoNodes.eq(highlightindex).css("backgroundColor", "#3366CC");
}
} else if (keyCode == 13) { //判断是否按下回车键
//下拉框有高亮
if (highlightindex != -1) {
lightEventHide();
highlightindex = -1;
} else {
alert("文本框中的[" + $("#word").val() + "]被提交了");
$("#auto").hide();
$("#word").get(0).blur();//让文本框失去焦点
}
//下拉框没有高亮
}
}
}
)
;
$("input[type='button']").click(function() {
alert("文本框中的[" + $("#word").val() + "]被提交了");
});
});
function lightEventHide(){
var comText = $("#auto").hide().children("div").eq(highlightindex).text();
$("#word").val(comText);
}
function lightEvent(){
var comText = $("#auto").children("div").eq(highlightindex).text();
$("#word").val(comText);
}
function autoHide(){
$("#auto").hide();
}
</script>
<h3>
<center>仿google自动补全(jQuery优化版)</center>
</h3>
<br />
<table align="center">
<tr><td>
<input type="text" id="word" maxlength=2048 size=55 />
<br/>
<td></tr>
<tr><td align="center">
<input type="button" value="shiyang 搜索"/>
</td></tr>
</table>
<br />
<div id="auto"></div>
</body>
</html>
这个例子引用：施杨de编程世界www.cnblogs.com/shiyangxt
4.重启tomcat，打开这个页面，访问：
不管是首字母还是中间的，都会有提示了！
这个demo没有和solr结合，现在我们加入solr，直接从solr里面取数据！
访问solr管理页面，选择要搜索的core和字段，还有值，看看有没有搜索结果出来。后期会加入可以动态编辑的字段还有值，使例子更实用些。
1.编写后台类，与solr交互，获取数据src\com\lifeix\util\SolrGetFtTopic.java
package com.lifeix.util;
import com.lifeix.entity.Word;
import org.apache.solr.client.solrj.SolrServer;
import org.apache.solr.client.solrj.SolrServerException;
import org.apache.solr.client.solrj.impl.HttpSolrServer;
import org.apache.solr.client.solrj.response.QueryResponse;
import org.apache.solr.common.SolrDocument;
import org.apache.solr.common.SolrDocumentList;
import org.apache.solr.common.params.ModifiableSolrParams;
import java.util.ArrayList;
import java.util.List;
/**
* Created by lhx on 14-12-9 上午10:30
*
* @project jspProject
* @package com.lifeix.util
* @blog http://blog.csdn.net/u011439289
* @email [email protected]
* @Description
*/
public class SolrGetFtTopic {
private static final String SOLR_URL = "http://192.168.199.22:8080/xxx/";
public List<Word> queryAll(){
ModifiableSolrParams params = new ModifiableSolrParams();
params.set("q","topicName:次");
params.set("start",0);
params.set("rows",Integer.MAX_VALUE);
params.set("sort","score desc");
params.set("f1","*,score");
SolrServer server = new HttpSolrServer(SOLR_URL);
List<Word> listWord = new ArrayList<Word>() ;
Word word = null ;
try {
QueryResponse response = server.query(params);
SolrDocumentList list = response.getResults();
for (int i = 0; i < list.size(); i++) {
word = new Word();
SolrDocument document = list.get(i);
word.setName( (String)document.getFieldValue("topicName") );
listWord.add(word);
}
return listWord ;
} catch (SolrServerException e) {
e.printStackTrace();
}
return null ;
}
}
2.修改src\com\lifeix\servlet\AutoCompleteServlet.java，主要就是把静态数据换成了从solr后台获取的list集合数据
package com.lifeix.servlet;
import com.lifeix.entity.Word;
import com.lifeix.util.SolrGetFtTopic;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;
/**
* Created by lhx on 14-12-9 上午9:31
*
* @project jspProject
* @package ${PACKAGE_NAME}
* @blog http://blog.csdn.net/u011439289
* @email [email protected]
* @Description
*/
public class AutoCompleteServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
StringBuffer sf = new StringBuffer("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
sf.append("<message>");
SolrGetFtTopic solrGetFtTopic = new SolrGetFtTopic();
List<Word> list = solrGetFtTopic.queryAll();
Iterator<Word> it = list.iterator();
while (it.hasNext()){
Word word1 = it.next();
if (word1 == null){
continue;
}
String name = word1.getName();
sf.append("<word>"+name);
sf.append("</word>");
}
sf.append("</message>");
PrintWriter pw = null;
try {
response.setContentType("text/xml;charset=utf-8");
response.setCharacterEncoding("UTF-8");
response.setHeader("Cache-Control", "no-cache");
pw = response.getWriter();
pw.print(sf.toString());
pw.flush();
}catch (Exception e) {
e.printStackTrace();
}
finally {
if (pw != null)
pw.close();
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request,response);
}
}
3.前台页面的jQuery代码可以纹丝不动，重启tomcat，先访问servlet，看看数据能不能正常获取：
没问题！！访问页面，也一样没问题！
时间： 2024-08-14 23:40:52