jQuery和$（document）.ready（）的计时问题

Question

I have the following code block code when the document is ready:

$(document).ready(function() {
    createDivs(); // creates some divs with class 'foo';

    // iterate
    $(".foo").each(function(index) {
        alert(index + " - " + $(this).text());
    });
}

I find that the "iterate" part misses the divs I created in the createDivs() method entirely! Is there some timing issue I'm not aware of? Why doesn't jquery see the divs that were just created?

Answer 1

In my experience DOM manipulation can act asynchronous at times, possibly due to optimization by the browser, my usual solution is to have createDivs() return the divs created then use the returned elements aswell

var divs = createDivs();
$('.foo').and(divs).each(function(){
    //happy fun time
})

Answer 2

The timing is not the issue. Maybe createDivs() doesn't add the elements to the DOM?

Answer 3

I've found that Javascript is like a bull in an F1 racer when it comes to executing code. There's no making it wait to execute code in any particular chain.

You should probably create a situation where createDivs() is able to fire any dependent code after it is complete vis-a-vis a callback. Without seeing the createDivs code, it's tough to give you a way to implement it.

Really only applies if you're doing an asynchronous call (according to my friends below).