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Introduction to the usage of Html5 new tag datalist

巴扎黑Original: 2017-08-08 16:25:062784browse

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,&#39;&#39;);search(&#39;name&#39;,&#39;bro&#39;,&#39;name&#39;)"  >  
                    <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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