Add childIndex property

[eorroe]

The childIndex property would return the index of that child Element from parent

Object.defineProperty(Node.prototype, 'childIndex', {
    get() {
        var currentElement = this.parentElement.firstElementChild, index = 0;
        while(currentElement.nextElementSibling) {
            if(this == currentElement) {
                return index;
            } else {
                index++;
                currentElement = currentElement.nextElementSibling;
            }
        }
    }
});

[ondras]

Is this a standardized API? Can you point me to some official docs for this?

[eorroe]

No it's not, it's an idea.

[ondras]

Ah. Well, even if the idea is useful (it is, in this particular case), we try to modify native prototypes only by adding standardized APIs (polyfills) to avoid potential namespace clashes and forward compatibility issues.

[eorroe]

Oh I saw this reference from mdn, which is under development I believe so I thought why not suggest the idea here, instead of in specifiction.org.