javascript - Event handler function out of scope in for -


the handler inside of loop might out of scope , prints "last event added" in console doesn't loop through each element in array. no sure i'm going wrong here, need attaching event listener each .

(function () {     if (document.addeventlistener) {         this.addevent = function (elem, type, fn) {             elem.addeventlistener(type, fn, false);         };     } else if (document.attachevent) {         this.addevent = function (elem, type, fn) {             var bound = function () {                 return fn.apply(elem, arguments);             };             elem.attachevent("on" + type, bound);             return bound;         };     }     if (document.getelementsbyclassname) {         this.getclass = function (classname) {             return document.getelementsbyclassname(classname);         };     } else if (document.queryselectorall) {         this.getclass = function (classname) {             return document.queryselectorall("." + classname);         };     }     var elem = getclass("images"),         display = getclass("display_box"),         rolloverimage = function (e) {             console.log("event 'rolloverimage' triggered");         };     console.log(display);     console.log(elem);     console.log(elem.length);     (var = 0; < elem.length; i++) {         document.addevent(elem[i], "mouseover", rolloverimage);         if (i = elem.length) {             console.log("last event added");         } else {             console.log("event added " + elem[i]);         }     }; })();

if wanting addevent function on document object use document.addevent = not this.addevent = putting on global object window

also doesnt loop through of them because assigning i elem array length instead of comparing.

if (i = elem.length) {

should be

if (i == elem.length) {

because of on first iteration through loop causes i value of elem.length , since i not < elem.length loop exits.


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