Setting an ASP Label control with text from JQuery

Question

I'm new to JQuery and I'm writing code to check a registration form. Here's my label in the server page:

<asp:Label ID="LabelErrorFirstName" runat="server" ForeColor="Red" Font-Size="Small"></asp:Label>

and my JQuery script:

if(firstnameTxt.length == '') {
      $('#<%= LabelErrorFirstName.ClientID %>').text("Please enter a first name.");

  }

I access this script from the OnClientClick event in a button on the form which I know works i.e. I set alerts here which shows it's getting there. I've commented out the 'if' statement in case that was the problem but it isn't.

What I want to happen is to have this label's text property set if the first name textbox is empty to "Please enter.." etc. I've tried many variations but I can't get it.

What am I missing?

Paul

Did you tried a RequiredFieldValidator control?

IUnknown
– IUnknown

2013-01-17 21:46:32 +00:00
Commented Jan 17, 2013 at 21:46 — IUnknown
– IUnknown, Commented Jan 17, 2013 at 21:46

Jono · Accepted Answer · 2013-01-17 22:22:52Z

1

Length is an integer not a string.

if(firstnameTxt.length == 0) {
    $('#<%= LabelErrorFirstName.ClientID %>').text("Please enter a first name.");
}

Also, make sure your label is being found by jquery:

if( $("#<%= LabelErrorFirstName.ClientID %>").length > 0 ) {
}

answered Jan 17, 2013 at 22:22

Jono

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1 Comment

Paul Cann Over a year ago

Yes, length does return an integer but, as I said in my post, "I've commented out the 'if' statement in case that was the problem but it isn't."

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