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Ajax three-level linkage notation

Source: Internet
Author: User
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Main Page code

<!DOCTYPE HTML><HTMLLang= "en"><Head>    <MetaCharSet= "UTF-8">    <title>Title</title>    <Scriptsrc=".. /wenjian/jquery-2.2.3.min.js "></Script></Head><Body><SelectID= "Sheng">    <option>Please select</option></Select><SelectID= "Shi">    <option>Please select</option></Select><SelectID= "Qu">    <option>Please select</option></Select></Body></HTML><Script>$.ajax ({data: {parent_id:0}, //the data sentDataType:"JSON", //the type of the return value text is string typeType:'Post',   //method of sending the request (get)URL:'sheng_l.php',//send the requested addressSuccess:function(data) {//callback function when sending successfully    //console.log (data);             for (varIinchdata) {                $("#sheng"). Append ("<option value= '"+data[i][2] +"' >" +data[i][1]  +"</option>")}}) $ (document). Ready (function () {        $("#sheng"). Change (function () {            $("#shi"). Get (0). Options.length= 1;//$ ("#qu"). Get (0). options.length= 1;            varData= $("#sheng"). Find ("option:selected"). Val (); $.ajax ({data:{parent_id:data}, type:"Post", DataType:"JSON", URL:"sheng_l.php", Success:function(data) { for(varIinchdata) {                        $("#shi"). Append ("<option value= '" +data[i][2] +"' >" +data[i][1] +"</option>")}})}) $ (document). Ready (function () {        $("#shi"). Change (function () {            $("#qu"). Get (0). Options.length= 1; varData= $("#shi"). Find ("option:selected"). Val (); $.ajax ({data:{parent_id:data}, type:"Post", DataType:"JSON", URL:"sheng_l.php", Success:function(data) { for (varIinchdata) {                        $("#qu"). Append ("<option value= '" +data[i][2] +"' >" +data[i][1] +"</option>")                    }                }            })        })    })

Working with page codes

<? PHP /*  */require_once ". /wenjian/dbda.class.php "; $db New Dbda (); $sql = "SELECT * from region WHERE father_id = {$_post[' parent_id ']}"; $result $db->query ($sql); echo json_encode ($result);

Ajax three-level linkage notation

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