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Old May 21st, 2007, 09:20 AM
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Default Change ASP.NET label color using Javascript

Hi everyone!

I have a web form with a lot of fields for users to fill in. Therefore I'd like to bring focus to the label associated with its textbox by changing its color. I've used a standard naming convention, so for the user input for "Name" I have "lblName" for the label and its associated textbox control being "txtName", and so on.

I have called many (simple) Java functions successfully from other .Net controls, but I want to call a function onFocus of the Textbox that goes along the lines of:

function labelFocus() {
    var x = window.event.srcElement.[?? Element ID Name ??];
    var y = x.Replace("txt", "lbl");

    document.getElementById(y).style.color = 'Blue';
}

I have minimal Javascript knowledge, hence not knowing the attributes for what I want to accomplish.

Can anyone help me out here?

Much appreciated and kind regards
shalan
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Old May 21st, 2007, 09:24 AM
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oh, sorry...I am calling the function from a code-behind page like so:

txtName.Attributes.Add("onfocus", "labelFocus(this);")
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Old May 21st, 2007, 11:04 AM
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Default

This might work for you:

function labelFocus(textBox) {
    var labelID = textBox.id.replace("txt","lbl");
    var label = document.getElementById(labelID);

    label.style.color = 'Blue';
}

Of course, you'll also need to store the last label object you touched so you can de-highlight it.

-Peter
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Old May 21st, 2007, 04:48 PM
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Hi Peter,

thanx! I'll give this a try and get back to you.

If the code works out, then I'll try to adopt something similar for the label to revert to its previous color in the onBlur event.

thanx again!

rgdz
shalan
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Old May 22nd, 2007, 02:09 AM
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Peter, THANX, just tried your code and it works perfectly!

much appreciated!

 


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