jQuery document.createElement equivalent?

jQuery document.createElement equivalent?

I’m refactoring some old JavaScript code and there’s a lot of DOM manipulation going on.
var d = document;
var odv = d.createElement(“div”);
odv.style.display = “none”;
this.OuterDiv = odv;

var t = d.createElement(“table”);
t.cellSpacing = 0;
t.className = “text”;
odv.appendChild(t);

I would like to know if there is a better way to do this using jQuery. I’ve been experimenting with:
var odv = $.create(“div”);
$.append(odv);
// And many more

But I’m not sure if this is any better.

Solutions/Answers:

Solution 1:

here’s your example in “one” line.

this.$OuterDiv = $('<div></div>')
    .hide()
    .append($('<table></table>')
        .attr({ cellSpacing : 0 })
        .addClass("text")
    )
;

Update: I thought I’d update this post since it still gets quite a bit of traffic. In the comments below there’s some discussion about $("<div>") vs $("<div></div>") vs $(document.createElement('div')) as a way of creating new elements, and which is “best”.

I put together a small benchmark, and here’s roughly the results of repeating the above options 100,000 times:

jQuery 1.4, 1.5, 1.6

               Chrome 11  Firefox 4   IE9
<div>            440ms      640ms    460ms
<div></div>      420ms      650ms    480ms
createElement    100ms      180ms    300ms

jQuery 1.3

                Chrome 11
<div>             770ms
<div></div>      3800ms
createElement     100ms

jQuery 1.2

                Chrome 11
<div>            3500ms
<div></div>      3500ms
createElement     100ms

I think it’s no big surprise, but document.createElement is the fastest method. Of course, before you go off and start refactoring your entire codebase, remember that the differences we’re talking about here (in all but the archaic versions of jQuery) equate to about an extra 3 milliseconds per thousand elements.

Update 2

Updated for jQuery 1.7.2 and put the benchmark on JSBen.ch which is probably a bit more scientific than my primitive benchmarks, plus it can be crowdsourced now!

http://jsben.ch/#/ARUtz

Solution 2:

Simply supplying the HTML of elements you want to add to a jQuery constructor $() will return a jQuery object from newly built HTML, suitable for being appended into the DOM using jQuery’s append() method.

For example:

var t = $("<table cellspacing='0' class='text'></table>");
$.append(t);

You could then populate this table programmatically, if you wished.

This gives you the ability to specify any arbitrary HTML you like, including class names or other attributes, which you might find more concise than using createElement and then setting attributes like cellSpacing and className via JS.

Solution 3:

Creating new DOM elements is a core feature of the jQuery() method, see:

Solution 4:

I’m doing like that:

$('<div/>',{
    text: 'Div text',
    class: 'className'
}).appendTo('#parentDiv');

Solution 5:

since jQuery1.8, using $.parseHTML() to create elements is a better choice.

there are two benefits:

1.if you use the old way, which may be something like $(string), jQuery will examine the string to make sure you want to select a html tag or create a new element. By using $.parseHTML(), you tell jQuery that you want to create a new element explicitly, so the performance may be a little better.

2.much more important thing is that you may suffer from cross site attack (more info) if you use the old way. if you have something like:

    var userInput = window.prompt("please enter selector");
    $(userInput).hide();

a bad guy can input <script src="xss-attach.js"></script> to tease you. fortunately, $.parseHTML() avoid this embarrassment for you:

var a = $('<div>')
// a is [<div>​</div>​]
var b = $.parseHTML('<div>')
// b is [<div>​</div>​]
$('<script src="xss-attach.js"></script>')
// jQuery returns [<script src=​"xss-attach.js">​</script>​]
$.parseHTML('<script src="xss-attach.js"></script>')
// jQuery returns []

However, please notice that a is a jQuery object while b is a html element:

a.html('123')
// [<div>​123​</div>​]
b.html('123')
// TypeError: Object [object HTMLDivElement] has no method 'html'
$(b).html('123')
// [<div>​123​</div>​]

Solution 6:

UPDATE

As of the latest versions of jQuery, the following method doesn’t assign properties passed in the second Object

Previous answer

I feel using document.createElement('div') together with jQuery is faster:

$(document.createElement('div'), {
    text: 'Div text',
    'class': 'className'
}).appendTo('#parentDiv');