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POvalidate username ajax and json and asp.net
 

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    <blockquote> <p>Hello,</p> <pre><code>I am trying to verify if a username is taken or available by </code></pre> <p>using jquery to send a request to an asp.net page. The ASP.net page is clearly getting the information as I am having it make an entry into a log database. My SQL server database indeed shows the username being passed to it and is returning a value however for some reason the client side html/javascript doesn't RESPOND to it. I am not sure if it is on the end of my html/javascript or perhaps my asp.net page is not returning the json information correctly? This is my first attempt at json</p> <p>The checking availability box shows up on the html page but it NEVER changes even when the sql server shows that it ran the stored procedure</p> </blockquote> <p>Html File</p> <p></p> <p> <pre><code> $(document).ready(function () { var validateUsername = $('#validateUsername'); $('#username').keyup(function () { var t = this; if (this.value != this.lastValue) { if (this.timer) clearTimeout(this.timer); validateUsername.removeClass('error').html('&lt;img src="images/ajax-loader.gif" height="16" width="16" /&gt; checking availability...'); this.timer = setTimeout(function () { $.ajax({ url: 'ValidateUsername.aspx', data: 'username=' + t.value, dataType: 'json', type: 'get', success: function (j) { validateUsername.html('HI!'); } }); }, 200); this.lastValue = this.value; } }); }); </code></pre> <p>//--> </p> <p> Username, valid: a-z.-_ </p> <pre><code>asp.net page [CheckusernameAvailable.aspx] &lt;%@ Language="C#" AutoEventWireup="true" CodeBehind="CheckUsernameAvailable.aspx.cs" Inherits="Services_UsernameAvailable" %&gt; </code></pre> <p>Asp.net code behind asp.net page [CheckusernameAvailable.aspx.cs]</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using UserSite.DataClasses; using System.Data; namespace OohruWeb { public partial class ValidateUsername : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { Response.ContentType = "application/json"; string NameToLookUp = Request.QueryString["username"]; if (NameToLookUp == null) { NameToLookUp = ""; } DbaseExecSpWithReturnValue Sproc = new DbaseExecSpWithReturnValue(); Sproc.SetSp("sp_CheckUsernameAvailable"); Sproc.AddParam(1); Sproc.AddParam("Username",SqlDbType.Char,NameToLookUp,20); int RetVal = Sproc.Execute(); Sproc.Close(); if (RetVal == 0) { Response.Write(@"'{""success"": false}'"); } if (RetVal == 1) { Response.Write(@"'{""success"": true}'"); } } } } </code></pre>
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