Using jQuery as a selector, working with JavaScript, is it possible?

Question

var helper, kitti, amount;
if (i == 0) { 
    helper = "#k" + ids+ " .contain";
}
else {
    helper = "#k" + ids + " .d" + i;
}    
kitti = "$(" + helper + ").get(0)";
amount = (MouseX-kitti.width / 2) * layer[i - 1] * 2;
kitti.style.transform = "rotateY(" + amount * 50 + "deg)";
kitti.style.left = amount + "px";

This part of my code doesn't seem to work but. I bet I did something wrong selecting it? I've read a couple of articles and I came to this conclusion. But it does not work, can you explain me why? How can I select classes with jQuery and after that continue with plain Javascript?

This asker mentions on his SO homepage that he is a hobbyist programmer. We can't expect him to know all the ins and outs of how to properly format code, so let's be gentle and helpful as much as possible. — Vivian River
– Vivian River, Commented Feb 21, 2013 at 19:55
Thanks man that helped! I have made some other mistakes too, but corrected them. — godzsa
– godzsa, Commented Feb 21, 2013 at 19:58
If an answer provided solves your problem, please click the checkmark next to the answer to mark it as the "accepted" solution. — Vivian River
– Vivian River, Commented Feb 21, 2013 at 20:02

Vivian River · Accepted Answer · 2013-02-21 19:53:59Z

3

You've made some simple syntax errors here. I personally don't care for the style in which you're written your code, but I will do my best to suggest what the fix might be.

In the second line, you write kitti = "$(" + helper + ").get(0)". The problem here is that $ is a function defined in the jQuery library and you are treating it as a string.

The result here will be to assign a string value to the variable kitti. You also appear to be using an undefined variable ids in line 1. The correct syntax would be something like this:

var kitti = $(helper).get(0);

I don't want to be overbearing, but from the syntax of the code in your question, you might benefit from reading a book on good JavaScript such as "JavaScript: The Good Parts", by Douglas Crockford. There is also lots of good information available for free on his web site.

answered Feb 21, 2013 at 19:53

Vivian River

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2 Comments

andyzinsser Over a year ago

+1 for javascript the good parts. Movie version here youtube.com/watch?v=hQVTIJBZook

Vivian River Over a year ago

I've watched many of Crockford's lectures on the "YUI Theater"; some of the best JavaScript learning experiences ever, IMHO. @dawe69hun would be well advised to be aware that JavaScript has a unique design and history that make it quite different from many other popular languages.

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