Jquery TypeError

Question

In jquery - what does (d||"").split do?

I've got a jqtouch webapp which throws up the following error from the jquery file:

TypeError: Result of expression '(d||"").split' [undefined] is not a function.

I've tried different versions of jquery but no joy. Is it something important or can I ignore it?

edit: This is the part of the function it comes from. I'm not really sure how much to include here but its line 68 from jquery.min:

if(c.isFunction(f)){e=f;f=w}for(d=(d||"").split(" ");

edit 2: I think its got to be caused by this function here from photoswipe.js:

// Set up the options 
    Code.PhotoSwipe.Current.setOptions(opts);


    // Tell PhotoSwipe about the photos
    Code.PhotoSwipe.Current.setImages(thumbEls);


    if (useEventDelegation){

        /*
         * Use event delegation rather than setting a click event on each 
         * thumb element.
         */
        containerEl.addEventListener('click', function(e){

            if (e.target === e.currentTarget){
                return;
            }

            e.preventDefault();

            var findNode = function(clickedEl, targetNodeName, stopAtEl){

                if (Util.isNothing(clickedEl) || Util.isNothing(targetNodeName) || Util.isNothing(stopAtEl)){
                    return null;
                }

                if (clickedEl.nodeName === targetNodeName){
                    return clickedEl;
                }

                if (clickedEl === stopAtEl){
                    return null;
                }

                return findNode(clickedEl.parentNode, targetNodeName, stopAtEl);
            };


            var clickedEl = findNode(e.target, thumbEls[0].nodeName, e.currentTarget);

            if (Util.isNothing(clickedEl)){
                return;
            }

            showPhotoSwipe(clickedEl);

        }, false);

    }
    else{

        // Add a click event handler on each element
        for (var i = 0; i < thumbEls.length; i++){

            var thumbEl = thumbEls[i];
            thumbEl.addEventListener('click', onClick, false);

        }

    }

    return thumbEls;

};
swipew

Answer 1

Try this code out:

var d = "matter";
(d||"").split("a"); //array: ["m","tter"]

var a = false;
(a||"").split("a"); //empty string

var c = true;
(c||"").split("a"); //type error

the || expression is a boolean check. If the left value is true (casted to boolean) then always return with the left, but if false then returns with the right.

"left"|| false  == "left"
"left"||"right" == "left"
 false||"right" == "right"

if d is boolean false it will return with the "" value, and then no error, but if the d is boolean true (boolean true is everything which is not boolean false) but not a string it can be a TypeError. Make sure that the d is converted to string with .toString()

true.split("r") will be type error, so you should use true.toString().split("r") and it will give you ["t","ue"]

So in the common form (d||"").toString().split("r") will be never type error

---

update

Oh i see your problem. I could help you better if you provide some source. Btw make sure you pass the right argument type to the invoked function. I dont know which fnction are you using but I am sure you pass something boolean or a number instead of a string, and i guess the problem is aboute .css() isn't it?
http://api.jquery.com/ documentation of jquery

Answer 2

It is trying to split a string into an array based on a regular expression.

It should probably be something like: split(d||"");

Why don't you edit your post to include the surrounding code?