I'm using a jQuery selector to return objects.
For example var target = $('.target');
will return 6 objects.
The objects do not have the same parent.
I want to give each object classes like so:
target[0].addClass('top');
target[1].addClass('middle');
target[2].addClass('low');
target[3].addClass('top');
target[4].addClass('middle');
target[5].addClass('low');
And so on... I thought I could use some modulus. I know the following is wrong.
target.each(function(index){
index += 1;
if (index % 3 === 0) {
$(this).addClass('low');
} else if(index % 2 === 0) {
$(this).addClass('middle');
} else {
$(this).addClass('top');
}
}
Is there an easy way that i'm over looking?
This should do what you want
var classes = ['top', 'middle', 'low'];
target.each(function(index){
$(this).addClass( classes[index % 3] );
}
Working demo
var classes = ['top', 'middle', 'low']; $(function() { var target = $('.target'); target.each(function(index) { $(this).addClass(classes[index % 3]); }); });
.top { color: red; } .middle { color: green; } .low { color: cyan; }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <div class="target">1</div> <div class="target">2</div> <div class="target">3</div> <div class="target">4</div> <div class="target">5</div> <div class="target">6</div>
You need to use the modulus operator, but first understand how it works:
a % b returns c if and only if b divides ac, or in other words c is the rest of the euclidian division of a over b.
Now this will work :
target.each(function(index){
if (index % 3 === 0) {
$(this).addClass('low');
} else if(index % 3 === 1) {
$(this).addClass('middle');
} else {
$(this).addClass('top');
}
}
jQuery's .each()
method increments the index itself, so you don't need to do the incrementation.
var target = $('.target');
target.each(function (i, el) {
switch (i % 3) {
default:
break;
case 0:
$(this).addClass("top")
break;
case 1:
$(this).addClass("middle")
break;
case 2:
$(this).addClass("bottom")
break;
}
});
As this elements aren't children of the same parent, you should try something like this.
<div>Top 1</div>
<div>Middle 1</div>
<div>Low 1</div>
<div>Top 2</div>
<div>Middle 2</div>
<div>Low 2</div>
<script>
$('div:nth-child(3n+1)').addClass("top");
$('div:nth-child(3n+2)').addClass("middle");
$('div:nth-child(3n+3)').addClass("low");
</script>
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