update panel of ajax

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i have textbox in updatepanel .when i enter name in textbox ,it will check whether name is in database or not.If name is exsist in database ,then near textbox massage will be display " name already exsist".
what i have to do for this?

Posted 17-Jan-13 7:26am

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David_Wimbley · Answer 1 · 2013-01-17T08:08:00

This isnt using an update panel but it will/should do the same thing if i understand your question correctly.

JQuery

JavaScript

$('#IdOfYourTextBox').keydown(function()
{
	var dataToSend={Send1:$("#IdOfYourTextBox").val(), Method:'CheckDB' };
 
		var opts =
		{
			url: '<%=ResolveUrl("~/YourCodeBehindFile.aspx") %>',
			data: dataToSend,
			dataType: 'JSON',
			type: 'POST',
			success: function (response) {
				//Do something here based on if the results meet your criteria
				//Set textbox back ground color to red or something
				$("#IdOfYourTextBox").css({"background-color": "green"});
				$("#IdOfHiddenReturnMsgDiv").html("Success!");
			}
		}
		$.ajax(opts);
});

Your code behind file

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
        if (Request.Form["Method"] == "CheckDB")
        {
            CheckDB();
            return;
        }
    }
}

public void CheckDB()
{
    //Do code here to check for name and if it exists, return a value if need be...change void to return value.
}