How to change the background color of a textbox if it reaches of a certain number?

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1.00/5 (2 votes)

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Basically the title, I want the textbox to be green when above 0 and red when below 0

What I have tried:

Tried doing a if statement, apparently doing it wrong.

Posted 23-Feb-16 14:48pm

m.justice10

Updated 23-Feb-16 15:53pm

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CoderzF1 23-Feb-16 21:03pm

use the keyup event. be sure to convert from a string to an integer or double. then use the if statement to check wether above zero or below zero. dont forget to take into account for a null string.

debashishPaul 23-Feb-16 21:55pm

How about when the text is pasted with mouse?

m.justice10 23-Feb-16 21:05pm

I already have all the doubles setup, this is just a small fraction of the code. I am new to C#, what is a KeyUp event? Not familiar with it.

debashishPaul 23-Feb-16 21:56pm

It is a javascript event...
http://www.w3schools.com/jsref/event_onkeyup.asp
http://www.w3schools.com/jquery/event_keyup.asp

BillWoodruff 24-Feb-16 0:14am

The question is ... probably ... about C#, not JavaScript

BillWoodruff 24-Feb-16 0:18am

Think about using a NumericUpDownControl if this is WinForms.

You need to show more of an effort here by tagging your question, and also show you have done more than just ask for what you want.

What's stopping you from looking up the 'Key Events, and trying them out by writing handlers for them ?

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debashishPaul · Answer 1 · 2016-02-23T15:53:00

Because texts in the textbox can be copied from somewhere and pasted using the mouse, I would use the following:

JavaScript

$("#TextBoxID").bind('input propertychange', function () {
    var textLen = this.value.length;
    
    if(textLen > 0)
        //Make it green
    else
        //Make it Red
});