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POvalidate username ajax and json and asp.net
 

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    <p>So I'm new to json/ajax/jquery/webservices</p> <p>I am trying to do a join page whereby the user types in a few letters and gets instant feedback on whether or not the username is available or not. </p> <p>I have an html file [the user front end], and an asmx webservice, the webservice checks to see if whatever text it has gotten exists [it runs a stored procedure which works fine]</p> <p>My html file doesn't seem be to calling my webservice. </p> <p>I have verified the webservice works by going to the asmx page and manually and typing in the value and it returns a true or false for me.<br> One problem is it seems to be returning it in XML as seen below instead of the json I was it to be in</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;string xmlns="http://localhost"&gt;{"available": false}&lt;/string&gt; </code></pre> <p>So on to the code/markup!</p> <p>My html file</p> <pre><code> &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml"&gt; &lt;head runat="server"&gt; &lt;script src="Scripts/jquery-1.4.1.js" type="text/javascript"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; &lt;!-- $(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({ contentType: "application/json; charset=utf-8", url: 'ValidateUser.asmx/GetUsernameAvailable', data: '{username: "'+t.value + '"}', dataType: 'json', type: "post", success: function (j) { validateUsername.html('I willl have my logic in here for changing the html on the label to reflect success or failure!'); } }); }, 200); this.lastValue = this.value; } }); }); //--&gt; &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;fieldset&gt; &lt;div&gt; &lt;label for="username"&gt;Username, valid: a-z.-_&lt;/label&gt; &lt;input type="text" name="username" value="" id="username" /&gt; &lt;span id="validateUsername"&gt;&lt;/span&gt; &lt;/div&gt; &lt;/fieldset&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>my asmx file</p> <pre><code>&lt;%@ WebService Language="C#" Class="ValidateUser" %&gt; using System; using System.Web; using System.Collections; using System.Web.Services; using System.Web.Services.Protocols; using System.Data; using System.Data.Odbc; using System.Web.Script.Serialization; using System.Web.Script.Services; using UserSite.DataClasses; [WebService(Description = "Web services to query Username availability.", Namespace = "http://localhost")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] [ScriptService] public class ValidateUser: System.Web.Services.WebService { [WebMethod(Description = "Gets the availability of a username.")] [ScriptMethod(ResponseFormat = ResponseFormat.Json)] public string GetUsernameAvailable(string username) { if (username == null) { username = ""; } DbaseExecSpWithReturnValue Sproc = new DbaseExecSpWithReturnValue(); Sproc.SetSp("sp_CheckUsernameAvailable"); Sproc.AddParam(1); Sproc.AddParam("Username", SqlDbType.Char, username, 20); int RetVal = Sproc.Execute(); Sproc.Close(); if (RetVal == 0) { return @"{""available"": false}"; } else { return @"{""available"": true}"; } } } </code></pre> <p>So the Stored Procedure works as I saw when I manually ran the asmx file but the html page is not calling it and my asmx file is not returning the data..... so basically Its driving me nuts!</p>
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