I have the following text input on a budget calculator form which displays the final balance...
<tr><td align="right"><b>Balance: £</b></td><td align="left"><input type="text" class="res" name="res" id="res" size="10" readonly="readonly"></td></tr>
How do I go about setting the background of the input to red using css and jquery if the value is a negative number?
开发者_C百科I am sure this is very simple but I have scanned the net looking for a solution for ages.
Please can someone help?, my head hurts!
$('input').blur(function () {
$(this).toggleClass('redBackground', $(this).val() < 0);
});
Set a class redBackground to give your inputs red background and it should work fine.
CSS:
input.redBackground {
background-color: red;
}
You can use the .bind to attach a onkeyup event to it.
$(document).ready(function(){
$('.res').bind('keyup', function() {
if($('.res').val() < 0){
$('.res').css({'background-color':'#FF0000'});
}});
});
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