Responding to an HTML element to change background and text of a DIV using jQuery

Question

I have an element that returns a value of either true or false when I run $('#myId').val() .

Once true or false is returned, I want to have a particular div change its background color to green for true or red for false.

if ($('#myId').val())
{
   code should return a div with text and green background
}
else
{
   code should return a div with text and red background
}

Answer 1

I'd say do a default green background class and then us an override class to add the red background. Your code would look something like this:

if ($('myId').val())
{
    $('myId').addClass('falseClass');
} else {
    $('myId').removeClass('falseClass');
};

Use CSS to add the background colors, like so:

.divClass{
background: green;
}

.divClass.falseClass{
background: red;
}

If you want to add a div with some specific text (say to whatever 'myId' marks), and then change the color, you can add the div first.

$('<div class="divClass">').appendTo('myId').text('foo')

if ($('myId').val())
{
    $('myId').addClass('falseClass');
} else {
    $('myId').removeClass('falseClass');
};

Answer 2

You have to convert the string to a bool to evaluate properly. I have a button in the fiddle to return the value.

JSFiddle

HTML:

<div id="myDiv">
    <input id="myID" value="false"/>
    <input id="myBtn" type="button" value="submit"/>
</div>

JQuery:

$('#myBtn').on('click', function () {
    $('#myDiv').css('background', (($('#myID').val() == "true") ? 'green' : 'red'));
});

Answer 3

<script type="text/javascript">
if ($('#myId').val()){
    showDiv("green");
}else{
    showDiv("red");
}

function showDiv(color){
    var text = "Hello world";
    return "<div class=\""+color+"\">"+text+"</div>";
}
</script>

<style>
.green{
    background-color:green;
}

.red{
    background-color:red;
}
</style>

Answer 4

This worked best for me:

  if ($('#myID').val()) {
       $('#SOMECLASS').text('Some Text').css('background-color', 'green');
  else
       $('#SOMECLASS').text('Some Text').css('background-color', 'red');
  }