Ajax implements the effect of changing the text of the input box to display the drop-down list

<style type="text/css">

<!--

body{background:#fff}

.Menu {

position:relative;

width:180px;

height:120px;

z-index:1;

background: #EEE;

border:1px solid #666;

margin-top:-100px;

display:none;

}

.Menu2 {

position: absolute;

left:0;

top:0;

width:100%;

height:120px;

overflow:hidden;

z-index:1;

OVERFLOW-y:auto;

}

.Menu2 ul{margin:0;padding:0}

.Menu2 ul li{width:100%;height:25px;line-height:20px;text-indent:15px;

border-bottom:1px dashed #999;color:#333;cursor:pointer;

change:expression(

this.onmouseover=function(){

this.style.background="";

},

this.onmouseout=function(){

this.style.background="";

}

)

}

input{width:120px}

#List1,#List2{left:0px;top:103px;}

-->

</style>

........省略常规脚本

<tr>

<th>汽车品牌名：</th>

<td>

<input type="text" id="generalBrandName" name="generalBrandName" value="${*.generalBrandName}" style="width:180px" data-validation-engine="validate[required]" <c:if test="${!empty carType.brandIdGeneral}"> disabled="disabled" </c:if> onfocus="showAndHide(&#39;List1&#39;,&#39;show&#39;);" onblur="showAndHide(&#39;List1&#39;,&#39;hide&#39;);"/>

<input type="hidden" id="brandIdGeneral" name="brandIdGeneral" value="${*.brandIdGeneral}" style="width:180px" />

<span class="required">必填*</span>

<p class="Menu" id="List1">

<p class="Menu2" id="ListLi1">

<%-- <ul>--%>

<%-- <li onmousedown="getValue(&#39;generalBrandName&#39;,&#39;宝马&#39;,&#39;brandIdGeneral&#39;,&#39;idx&#39;);showAndHide(&#39;List1&#39;,&#39;hide&#39;);">宝马</li>--%>

<%-- <li onmousedown="getValue(&#39;generalBrandName&#39;,&#39;奥迪&#39;,&#39;brandIdGeneral&#39;,&#39;idx&#39;);showAndHide(&#39;List1&#39;,&#39;hide&#39;);">奥迪</li>--%>

<%-- </ul>--%>

</p>

</p>

</td>

</tr>

........省略常规脚本

<tr>

<th>汽车厂商名：</th>

<td>

<input type="text" id="brandName" name="brandName" value="${*.brandName}" style="width:180px" data-validation-engine="validate[required]" <c:if test="${!empty carType.brandId}"> disabled="disabled" </c:if> onfocus="showAndHide(&#39;List2&#39;,&#39;show&#39;);" onblur="showAndHide(&#39;List2&#39;,&#39;hide&#39;);" />

<input type="hidden" id="brandId" name="brandId" value="${*.brandId}" style="width:180px" />

<span class="required">必填*</span>

<p class="Menu" id="List2">

<p class="Menu2" id="ListLi2">

</p>

</p>

</td>

</tr>

//页面加载的时候

jQuery(function($) {

if (navigator.userAgent.indexOf("MSIE") > 0) {

document.getElementById('generalBrandName').attachEvent("onPropertyChange", appendList);

document.getElementById('brandName').attachEvent("onPropertyChange", appendList);

}

else if (navigator.userAgent.indexOf("Firefox") > 0) {

document.getElementById('generalBrandName').addEventListener("input", appendList, false);

document.getElementById('brandName').addEventListener("input", appendList, false);

}

});

//////// 预加载

jQuery(function($) {

txtValue = $("#generalBrandName").val();

//////// 给txtbox绑定键盘事件

$("#generalBrandName").bind("keyup", function() {

var currentValue = $(this).val();

if (currentValue != txtValue) {

appendList('List1',currentValue);

txtValue = currentValue;

}

});

txtValue = $("#brandName").val();

//////// 给txtbox绑定键盘事件

$("#brandName").bind("keyup", function() {

var currentValue = $(this).val();

if (currentValue != txtValue) {

appendList('List2',currentValue);

txtValue = currentValue;

}

});

});

//实现动态显示下拉列表内容的function

//根据输入框中的值来筛选obj中的值

function appendList(obj,value){

value = encodeURIComponent(value); value = encodeURIComponent(value); //两次使用encodeURI()

switch(obj){

case "List1": //根据车品牌名来刷选List1中的值

$.getJSON(

ctx + "/car/carmodel/**.do",

{keyWord : value, id : new Date().getTime()}, <!-- 产生一个时间戳，不让IE以为是相同的URL而使用cache -->

function (json) {

createLis('ListLi1',json);

}

);

break;

case "List2": //根据车厂商名来刷选List2中的值

$.getJSON(

ctx + "/car/carmodel/**.do",

{keyWord : value, id : new Date().getTime()}, <!-- 产生一个时间戳，不让IE以为是相同的URL而使用cache -->

function (json) {

createLis('ListLi2',json);

}

);

break;

}

}

function createLis(obj,json){

switch(obj){

case "ListLi1": //根据车品牌名来刷选List1中的值

var executerp = document.getElementById(obj); //动态生成下拉列表框

executerp.innerHTML="";

var ul=document.createElement("ul");

$.each(json, function (i, item) {

var li=document.createElement("li");

var str = "getValue('generalBrandName','"+item.brandNameGeneral+"','brandIdGeneral','"+item.brandIdGeneral+"');showAndHide('List1','hide')";

li.setAttribute("onmousedown",str);

li.appendChild(document.createTextNode(item.brandNameGeneral));

ul.appendChild(li);

});

executerp.appendChild(ul);

break;

case "ListLi2": //根据车厂商名来刷选List2中的值

var executerp = document.getElementById(obj); //动态生成下拉列表框

executerp.innerHTML="";

var ul=document.createElement("ul");

$.each(json, function (i, item) {

var li=document.createElement("li");

var str = "getValue('brandName','"+item.brandName+"','brandId','"+item.brandId+"');showAndHide('List1','hide')";

li.setAttribute("onmousedown",str);

li.appendChild(document.createTextNode(item.brandName));

ul.appendChild(li);

});

executerp.appendChild(ul);

break;

}

}

//显示或者隐藏层

function showAndHide(obj,types){

var Layer=window.document.getElementById(obj);

switch(types){

case "show":

Layer.style.display="block";

appendList(obj,'');

break;

case "hide":

Layer.style.display="none";

break;

}

}

//获取选中节点的内容

function getValue(obj1,str,obj2,idx){

var input=window.document.getElementById(obj1);

input.value=str;

var input=window.document.getElementById(obj2);

input.value=idx;

}