Solved

How do i pass an argument to an eventListener in a quick easy way?

Posted on 2011-09-27
3
252 Views
Last Modified: 2012-05-12
Hi

I'm trying to solve this thing with passing variables with eventListeners..
Why is it so hard? Seriously?

currentObject is null when i'm trying to alert this and I've come to understand that it has something with closure to do. But isn't there som way to get the variables in there anyway?

I just want a way to pass arguments to a function that i call when i press an html-object.
It would probably work with setting ahref to the object,, or perhaps giving the html-object a attribute (nr), and then use .this to get it's attribute. But is this really neccessary?


function outerFunction() {
	var currentObject = g.objectHandler.first;
	var newObjectTitle;
	var newTextNode;
	
	while(currentObject != null) {

		newObjectTitle = document.createElement('p');
		newTextNode = document.createTextNode(currentObject.title);
		newObjectTitle.appendChild(newTextNode);
		newScrollBox.appendChild(newObjectTitle);

		newObjectTitle.addEventListener('click', function(){innerFunction(currentObject.nr)},false);
		
		////////////////////////////////////////
		
		currentObject = currentObject.next;		
	}
}


function innerFunction(nr) {
	alert(nr);
}

Open in new window

0
Comment
Question by:walkman69
3 Comments
 
LVL 10

Expert Comment

by:JPJ78
ID: 36715037
Maybe you can use.

newObjectTitle.addEventListener('click', function(){ eval("innerFunction(" + currentObject.nr + ");");}, false);
0
 
LVL 6

Accepted Solution

by:
mattjp88 earned 500 total points
ID: 36715761
use anonymous functions:

newObjectTitle.addEventListener('click', function(co){  return function(){  innerFunction(co.nr)  } }(currentObject),false);

Open in new window


It's all about scope.  The function(co) function will take in the object you are referencing and then return a new function that will get called when the event triggers.

-Matt
0
 
LVL 2

Author Closing Comment

by:walkman69
ID: 37123492
Nice.. thanx! =)
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Sum Column in GridView 3 41
Google Map JavaScript API 4 39
Animated .jpg? 13 57
insert text field data into html script 13 18
In my daily work (mainly using ASP.net), I need to write a lot of JavaScript code. One of the most repetitive tasks I do are the jQuery Ajax calls. You know: (CODE) I don't know if for you it's the same, but for me is soooo tedious to write the …
This article will give core knowledge of JavaScript and will head in to your first JavaScript program. I am Durvesh Naik and I am here to deal with this series of JavaScript. I will teach you JavaScript in part wise , as its quite boring to read big…
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)
The viewer will learn the basics of jQuery including how to code hide show and toggles. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery…

932 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

8 Experts available now in Live!

Get 1:1 Help Now