Home > Article > Web Front-end > Detailed explanation of Html5 datalist tag and dynamic matching with background data
HTML5’s new tag datalist enables automatic entry into the database fuzzy query when entering the first letter of Chinese/Pinyin, and returns the corresponding results to generate a datalist. When the input content in the input box changes, the datalist will automatically trigger the drop-down. Frame, the solution is very good. Let me share the example code with you through this article. Friends who need it can refer to it
The recent project involves a small function. When customers choose suppliers, due to the large number of suppliers, There are many (about 3,000), so it is obviously unrealistic to directly generate drop-down boxes, so I changed the solution and planned to use the new tag datalist in HTML5 to automatically enter the database fuzzy query when entering the first letter of Chinese/Pinyin and return the corresponding As a result, a datalist is generated. Since the datalist will automatically trigger the drop-down box when the input content in the input box changes, it is more convenient to use than select. The front-end code is as follows:
Html Code:
<!DOCTYPE html>
<html lang="en">
<head id="head">
<title>库存下拉框测试</title>
<meta charset="utf-8">
<meta content="IE=edge,chrome=1" http-equiv="X-UA-Compatible">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="">
<meta name="author" content="">
<script src="../../Common/content/jquery-1.7.2.min.js"type="text/javascript"></script>
<script src="../../Common/pages/include.js" class="include" type="text/javascript"></script>
<script src="../../Common/js/AjaxJson.js" type="text/javascript"></script>
<script src="../../Common/js/Setting.js" type="text/javascript"></script>
<script src="../../Common/js/Paging.js" type="text/javascript"></script>
<script src="../../Js/warehouseManage/testyy.js" type="text/javascript"></script>
</head>
<body class="">
<!--<![endif]-->
<p class="navbar"></p>
<p class="sidebar-nav"></p>
<p class="content">
<p class="header"><h1 id="ADU" class="page-title">下拉框测试</h1></p>
<p class="container-fluid">
<p class="row-fluid">
<!-- --------------------------多条件查询--------------------------------------------- -->
<p class="well" id="searchDemo">
<p>测试数据(默认均为d00001)：<br> 昆山市大陆配件有限公司 ksdlpjyxgs <br>
亿真企业有限公司 yzqyyxgs <br>
泰州市安誊轴皮厂（集团厂） tzsatzpc(jtc)
</p>
</p>
按 供应商名动态匹配（中文或者拼音均可）：
<input list="bro" id="name" oninput="this.value=this.value.replace(/^ +| +$/g,'');search('name','bro','name')" >
<datalist id="bro"></datalist>
</p>
</p>
</p>
</body>
<!-- -----------------------footer-------------------------- -->
<footer class="foot"></footer>
</html>JavaScript Code:
var listobj=null; //datalist对象
var requestItem=null; //后台返回的json数据中所需的key值
var inputContent=null; //input标签对象
/**search（）说明：
* inputID： input标签的ID
* datalistID： datalist标签的ID
* itemName： 后台返回的json数据中所需的key值（仅需表格中中文字段的属性名）
* */
function search(inputID,datalistID,itemName)
{
inputContent=document.getElementById(inputID);
var datalist=document.getElementById(datalistID);
//防止在无输入内容的情况下产生遗留下拉选项
if(inputContent.value.length==0||inputContent.value==" ")
{
var sub=datalist.childNodes;
if(sub.length>0)
{
for (var i =sub.length-1; i>=0 ; i--)
{
datalist.removeChild(sub[i]);
}
}
listobj=null;
requestItem=null;
inputContent.value=null;
return false;
}
//全局变量赋值
listobj=datalist;
requestItem=itemName;
var data="";
var url="";
if(/^[a-zA-Z]*$/.test(inputContent.value))
{
//检测出是拼音首字母
data="type=searchWords¶m="+inputContent.value; //注意：data-----------需要自定义
url=baseurl + "/servlet/ListDemo"; //注意：url-----------需要自定义
sendRequest("post",url,data,getResult);
}
else if (/^[\u4e00-\u9fa5]*$/.test(inputContent.value))
{
//检测出是中文
data="type=searchChinese¶m="+inputContent.value; //注意：data-----------需要自定义
url=baseurl + "/servlet/ListDemo"; //注意：url-----------需要自定义
sendRequest("post",url,data,getResult);
}
}
//填写仓库下拉框
function getResult(result)
{
var data=result;
var JData=eval("(" + data + ")");
var maxlength=10; //注释：maxlength保证过多查询结果下只显示10条
if(JData.length<=10)
{
maxlength=JData.length;
}
var sub=listobj.childNodes;
for (var i =sub.length-1; i>=0 ; i--)
{
listobj.removeChild(sub[i]); //清空datalist所有的下拉选项
}
if(JData.length==0) //没有查询结果
{
alert("没有符合条件的结果，请重输");
inputContent.value=""; //清空input输入框的值
return false;
}
for (var i=0;i<maxlength;i++)
{
var obj=document.createElement("option");
var indexobj=JData[i];
if(/^[a-zA-Z]*$/.test(inputContent.value))
{
obj.value=indexobj[requestItem];
obj.innerHTML=inputContent.value;
}
if (/^[\u4e00-\u9fa5]*$/.test(inputContent.value))
{
obj.value=indexobj[requestItem];
}
listobj.appendChild(obj);
}
var suffix=document.createElement("option");
suffix.value=" ";
suffix.innerHTML="输入更多有关"+inputContent.value+"的信息";
listobj.appendChild(suffix);
return false;
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