Detailed explanation of Html5 datalist tag and dynamic matching with background data

Y2J

Release： 2017-05-22 10:15:49

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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:

库存下拉框测试

下拉框测试

测试数据(默认均为d00001)：
昆山市大陆配件有限公司 ksdlpjyxgs
亿真企业有限公司 yzqyyxgs
泰州市安誊轴皮厂（集团厂） tzsatzpc(jtc)

按供应商名动态匹配（中文或者拼音均可）：

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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;iCopy after login

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