使用jquery实现仿百度自动补全特效

前端技术 2023/09/08 JavaScript

新建index.html文件,直接复制下面代码到新建的文件index.html里面,用浏览器访问,仅用于参考:

<!doctype html>
<html>
<meta charset=\"utf-8\">
<style>
body {
margin-left: 0px;
margin-top: 0px;
margin-right: 0px;
margin-bottom: 0px;
}
.auto_hidden {
width:204px;border-top: 1px solid #333;
border-bottom: 1px solid #333;
border-left: 1px solid #333;
border-right: 1px solid #333;
position:absolute;
display:none;
}
.auto_show {
width:204px;
border-top: 1px solid #333;
border-bottom: 1px solid #333;
border-left: 1px solid #333;
border-right: 1px solid #333;
position:absolute;
z-index:9999; /* 设置对象的层叠顺序 */
display:block;
}
.auto_onmouseover{
color:#ffffff;
background-color:highlight;
width:100%;
}
.auto_onmouseout{
color:#000000;
width:100%;
background-color:#ffffff;
}
</style>
<script language=\"javascript\">
<!--
var $ = function (id) {
return \"string\" == typeof id ? document.getElementById(id) : id;
}
var Bind = function(object, fun) {
return function() {
return fun.apply(object, arguments);
}
}
function AutoComplete(obj,autoObj,arr){
this.obj=$(obj); //输入框
this.autoObj=$(autoObj);//DIV的根节点
this.value_arr=arr; //不要包含重复值
this.index=-1; //当前选中的DIV的索引
this.search_value=\"\"; //保存当前搜索的字符
}
AutoComplete.prototype={
//初始化DIV的位置
init: function(){
this.autoObj.style.left = this.obj.offsetLeft + \"px\";
this.autoObj.style.top = this.obj.offsetTop + this.obj.offsetHeight + \"px\";
this.autoObj.style.width= this.obj.offsetWidth - 2 + \"px\";//减去边框的长度2px
},
//删除自动完成需要的所有DIV
deleteDIV: function(){
while(this.autoObj.hasChildNodes()){
this.autoObj.removeChild(this.autoObj.firstChild);
}
this.autoObj.className=\"auto_hidden\";
},
//设置值
setValue: function(_this){
return function(){
_this.obj.value=this.seq;
_this.autoObj.className=\"auto_hidden\";
}
},
//模拟鼠标移动至DIV时,DIV高亮
autoOnmouseover: function(_this,_div_index){
return function(){
_this.index=_div_index;
var length = _this.autoObj.children.length;
for(var j=0;j<length;j++){
if(j!=_this.index ){
_this.autoObj.childNodes[j].className=\'auto_onmouseout\';
}else{
_this.autoObj.childNodes[j].className=\'auto_onmouseover\';
}
}
}
},
//更改classname
changeClassname: function(length){
for(var i=0;i<length;i++){
if(i!=this.index ){
this.autoObj.childNodes[i].className=\'auto_onmouseout\';
}else{
this.autoObj.childNodes[i].className=\'auto_onmouseover\';
this.obj.value=this.autoObj.childNodes[i].seq;
}
}
}
,
//响应键盘
pressKey: function(event){
var length = this.autoObj.children.length;
//光标键\"↓\"
if(event.keyCode==40){
++this.index;
if(this.index>length){
this.index=0;
}else if(this.index==length){
this.obj.value=this.search_value;
}
this.changeClassname(length);
}
//光标键\"↑\"
else if(event.keyCode==38){
this.index--;
if(this.index<-1){
this.index=length - 1;
}else if(this.index==-1){
this.obj.value=this.search_value;
}
this.changeClassname(length);
}
//回车键
else if(event.keyCode==13){
this.autoObj.className=\"auto_hidden\";
this.index=-1;
}else{
this.index=-1;
}
},
//程序入口
start: function(event){
if(event.keyCode!=13&&event.keyCode!=38&&event.keyCode!=40){
this.init();
this.deleteDIV();
this.search_value=this.obj.value;
var valueArr=this.value_arr;
valueArr.sort();
if(this.obj.value.replace(/(^\\s*)|(\\s*$)/g,\'\')==\"\"){ return; }//值为空,退出
try{ var reg = new RegExp(\"(\" + this.obj.value + \")\",\"i\");}
catch (e){ return; }
var div_index=0;//记录创建的DIV的索引
for(var i=0;i<valueArr.length;i++){
if(reg.test(valueArr[i])){
var div = document.createElement(\"div\");
div.className=\"auto_onmouseout\";
div.seq=valueArr[i];
div.onclick=this.setValue(this);
div.onmouseover=this.autoOnmouseover(this,div_index);
div.innerHTML=valueArr[i].replace(reg,\"<strong>$1</strong>\");//搜索到的字符粗体显示
this.autoObj.appendChild(div);
this.autoObj.className=\"auto_show\";
div_index++;
}
}
}
this.pressKey(event);
window.onresize=Bind(this,function(){this.init();});
}
}
//-->
</script>
<body>
<div align=\"center\" style=\"padding-top:50px\">
<input type=\"text\" style=\"width:300px;height:20px;font-size:14pt;\" placeholder=\"请输入a或b模拟效果\" id=\"o\" onkeyup=\"autoComplete.start(event)\">
</div>
<div class=\"auto_hidden\" id=\"auto\"><!--自动完成 DIV--></div>
<script>
var autoComplete=new AutoComplete(\'o\',\'auto\',[\'b0\',\'b12\',\'b22\',\'b3\',\'b4\',\'b5\',\'b6\',\'b7\',\'b8\',\'b2\',\'abd\',\'ab\',\'acd\',\'accd\',\'b1\',\'cd\',\'ccd\',\'cbcv\',\'cxf\']);
</script>
</body>
</html>

以上所述就是本文的全部内容了,希望大家能够喜欢。

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