Ajax and Json implements a background collection to the foreground and assigns a value to the text box-----ajax\json\jquery

Function: Put two text boxes and a OK button, determine button binding point Click event, click OK to load the data in the background database, display in the text box.

Basic knowledge: JQuery ajax async. Eval (). each () JSON data

1. html file

<DivID= "Text"> <inputtype= "text"ID= "Comment1"name= "T_a21"Numberid= "One"value="" /> <inputtype= "text"ID= "Comment2"name= "T_a22"Numberid= "One"value="" /> <inputtype= "button"class= "Button1"onclick= "Showsenddialog (' Divoutputselcet ')" >Are you sure</Intput> <inputtype= "text"ID= "Hidcomment"value= "321" /></Div>

2. js file

function(obj) {$.ajax ({URL:"Relative Path/xxx.ashx", Global:false, DataType:"JSON", data:{"Functiontype": "Comment", "PrimaryKey": $ ("#hidcomment"). Val ()},//to the background with the parameters success inside can not be used success:function(data) {varresult =eval (data. Data);varNumberid = "One"varInputlist = $ ("#Text"). Find ("input[numberid=" + numberid+ "']");//Theoretically the ID cannot be duplicated if the repetition can be located with $ ("#Text #txtComment")$ (inputlist). each (function(){   for(vari = 0; i < result.length; i++) {    varTempcode = $ ( This). attr ("name"). Substring (2,5); if(Result[i]. Linecode = = Tempcode) {//Result[i]. Linecode Background database Linecode field matches the foreground text box name value 2-5 phase$( This). Val (Result[i]. Itemvalue)//field Itemvalue in database      }}); /Another notation *$ ("#Text"). Find ("input[numberid=" + numberid+ "']"). each (function () {}*/},error:function(str) {alert (str. Message);} });}

3, Backstage Xxx.ashx

 Public voidProcessRequest (HttpContext context) {context. Response.ContentType="Text/plain"; stringFunctiontype = context. request["Functiontype"].        ToString (); Switch(functiontype) { Case "Comment": HttpContext.Current.Response.Write (Getcomment ());  Break; }    }   Public stringgetcomment () {Try        {            stringprimarykey= httpcontext.current.request["PrimaryKey"]; ENTERPRISECOMMENTBLL ECBLL=NewENTERPRISECOMMENTBLL ();//Business Logic LayerEnterprisecommentmodel Ecmodel = Efcbll.getmodel (orderId);//Model Class Library            return NewPagemessageex (true,"successful delivery of information", Efcmodel). ToString ();//The PageMessageEx.cs file placed in App_Code encapsulates a method,. ToString () is a well-encapsulated property converted to JSON data        }        Catch(Exception ex) {return NewPagemessage (false, ex. Message). ToString ();//The PageMessage.cs file placed in App_Code encapsulates a method,. ToString () is a well-encapsulated property converted to JSON data        }    }

4, PageMessage.cs and PassageMessageEx.cs (placed in App_Code)

(1) Pagemessage

usingSystem;usingNewtonsoft.json;/// <summary>///provides a data carrier for the return information of the server-side Ajax call to the page/// </summary> Public classpagemessage{ Publicpagemessage () {}/// <summary>    ///constructs a return information object and specifies the operation result and prompt information/// </summary>    /// <param name= "Result" >Operation Result</param>    /// <param name= "message" >Prompt Information</param>     PublicPagemessage (BOOLResultstringmessage) {         This. _result =result;  This. _message =message; }    /// <summary>    ///Results/// </summary>    Private BOOL_result; /// <summary>    ///Result Information Description/// </summary>    Private string_message; /// <summary>    ///Gets or sets the error result/// </summary>     Public BOOLResult {Get        {            return_result; }        Set        {             This. _result =value; }    }    /// <summary>    ///Gets or sets the result information description/// </summary>     Public stringMessage {Get        {            return_message. Replace ("\ r \ n", String.Empty); }        Set        {             This. _message =value; }    }        /// <summary>    ///returns the JSON representation of the information/// </summary>    /// <returns>JSON representation</returns>     Public Override stringToString () {returnJsonconvert.serializeobject ( This); }}

(2) Pagemessageex (inheriting pagemessage)

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingsystem.web;usingNewtonsoft.json;/// <summary>///Summary description of Pagemessageex/// </summary> Public classpagemessageex:pagemessage{ PublicPagemessageex () {//        //TODO: Add constructor logic here//    }     PublicPagemessageex (BOOLResultstringMessageObjectdata) {         This. Result =result;  This. Message =message;  This. Data =data; }    /// <summary>    ///Data/// </summary>    Private Object_data; /// <summary>    ///Gets or sets the data/// </summary>     Public ObjectData {Get{return_data;} Set{_data =value;} }     Public Override stringToString () {returnJsonconvert.serializeobject ( This); }}

Ajax and Json implements a background collection to the foreground and assigns a value to the text box-----ajax\json\jquery