Return false from within a nested control structure

JavaScript
1

Hi,

How do I return false (or true) from within a nested control structure.

For example, I’m using jquery and I would like to do some basic validation:

I want to pass to a custom function named checkDefault every element with the class required.

function checkDefault(elem) {
elem.each(function(){
if(elem.val() == elem.attr(‘title’)) return false;
}
}

I would like when I return false from the each loop to also return false from the checkDefault function. Is that possible?

Thanks in advance!
Global

2

Nope, not with using each

A for loop would be the most straightforward way.

3

Returning false from jQuery’s .each method just stops the loop from continuing.

You will need to set a variable in the checkDefault function, and return that instead.


function checkDefault(elem) {
    var missingTitle = true;
    elem.each(function () {
        if (elem.val() == elem.attr('title')) {
            missingTitle = false;
        }
    }
    return missingTitle;
}
4

Hey thanks for that pmw57!

I considered a similar approach but thought in javascript it might be flimsy because of an experience I had trying to set a variable within an ajax call. Let me explain:

Javascript evaluated the variable in question before ajax had a chance to change the same variables value, even though I had the ajax written at the top of the script.

So I didn’t know whether javascript was as sequential as say php which I have a little more experience with… Because it was executing code written after other areas of code that hadn’t finished yet…

Does that make sense?

5

The caution makes sense. When AJAX is being done, the asynchronous nature of things can cause problems.

Fortunately though, with almost everything else regarding javascript, it is sequential as expected.

6

Thanks for enlightening me…