Label Does Not Change After TextBox OnTextChanged Event ASP.NET

Question

I have a username TextBox and a Label which should update to (V or X) when the TextBox text is changed. The label is updated only if, for example I press a button which automatically refreshes the page.

Here is the code:

<asp:TextBox ID="username" runat="server" OnTextChanged="checkUsername" Width="80%"></asp:TextBox>

<asp:Label ID="usernameCheck" runat="server" CssClass="checkL"></asp:Label>

And the aspx.cs

protected void checkUsername(object sender, EventArgs e)
{
    if (username.Text.Length < 3 || username.Text.Length > 15)
    {
        //---Label = X (in red)
        usernameCheck.Text = "\u2715";
    }
    else
    {
        if (myBl.checkUsername(Convert.ToString(username)))
        {
            //---Label = X (in red)
            usernameCheck.Text = "\u2715";
        }
        else
        {
            //---Label = V (in green)
            usernameCheck.Text = "\u2713";
        }
    }

}

Thanks for any help.

ElGavilan · Accepted Answer · 2015-04-09 15:53:04Z

1

You need to add AutoPostBack="true" to your TextBox. This will cause it to post back and for that server side event to fire.

There are much better ways of doing what you are trying to accomplish though, most of which do not require a full page postback. I would try to make an AJAX call using the javascript change event, and using something like a callback method.

answered Apr 9, 2015 at 15:53

ElGavilan

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12 Comments

korkotyan Over a year ago

Thanks for the answer. How do I do the same with a TextMode="password", I think the AutoPostBack="true" clears the password TextBox

ElGavilan Over a year ago

When using textmode="password" the textbox will not persist after postback. This is a built in security measure. What exactly are you trying to accomplish with your password box?

korkotyan Over a year ago

First to validate the password and Second to compare between password and re-password

ElGavilan Over a year ago

I would do that on the client side. Avoids a postback and provides a better user experience. As for validating the password how are you needing to validate it?

korkotyan Over a year ago

Thanks for the fast responses. Basically I need to check the password length and maybe I will add some forbidden character and the re-password check.

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