I have been working on a javascript library for event handling. Here is some of the library's code:
01| (function(){
02| var int,
03| Jist = function(s){
04| return new Jist.fn.init(s);
05| };
06| Jist.fn = Jist.prototype ={
07| init : function(s){
08| if(!s){
09| return this;
10| }
11| else{
12| this.length = 1;
13| if (typeof s === "object"){
14| this[0] = s;
15| }
16| else if(typeof s === "string"){
17| var obj;
18| obj = document.querySelectorAll(s);
19| this[0] = obj;
20| this.elem = this[0];
21| }
22| return this;
23| }
24| },
25| };
26| Jist.fx ={
27| event : function(event,callback,state){
28| var dummy = (state) ? false : state;
29| for(var i=0; i<this.elem.length; i++) {
30| this.elem[i].addEventListener(event,callback,dummy);
31| }
32| return this;
33| },
34| }
35| Jist.fn.init.prototype = Jist.fn;
36| Jist.fn.init.prototype = {
37| print : function(txt){
38| for(var i=0; i<this.elem.length; i++) {
39| this.elem[i].innerHTML = txt;
40| }
41| return this;
42| },
43| click : function(callback){
44| Jist.fx.event("click",callback);
45| return this;
46| },
47| };
48| window.Jist = window._ = Jist;
49| })();
All seems fine in that...
And then On my webpage, here is what I have to test it out:
01| <div id="enter">Begin!</div>
02| <script>
03| _("#enter").click(function(){
04| _("#enter").print("It worked!");
05| })
06| </script>
Seems fine here too.
It seems like this should work, but instead I get an error that reads: 'undefined' is not an object (evaluating this.elem.length)[line 29 in the library]
Does anyone know how I can fix this error?
Help is greatly appreciated.
Thank you.