JS实现的一个简单的Autocomplete自动完成例子

前端技术 2023/09/04 JavaScript

分享一篇无意间发现的自动完成源码。这里测试的时候使用的是数组,实际使用的时候,我们换成Ajax从服务器端获取的方式就OK了。

提示:可以直接保存到一个html文件中查看效果。

复制代码 代码如下:

<!doctype html>
<html>
<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>
<h1 align=\"center\">自动完成函数(Autocomplete Function)</h1>
    <div align=\"center\"><input type=\"text\" style=\"width:300px;height:20px;font-size:14pt;\" 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>

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