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Thread: addEventListener in custom object

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  1. #1
    Join Date
    Mar 2010
    Posts
    11

    addEventListener in custom object

    I'm trying to understand how a custom object can call a function within itself. Say I have something like this:

    Code:
    function functiontest()
    {
        
        this.prop1 = '',
        this.prop2 = '',
        this.options = {initiallevels:0},
        this.prop3 = '/blah',
        this.prop4 = true,
    
        this.function4 = function(x)
        {
            console.log(x)
        },
        
        this.init = function(options)
        {
            this.uid=options.uid
            this.t=options.target
            
            gebid(this.t).addEventListener('click',function(){this.uid.function4(this.t)},false)
            
        }
    }
    
    myfun1=new functiontest
    myfun1.init({uid:'myfun1',target:'target1'})
    
    myfun2=new functiontest
    myfun2.init({uid:'myfun2',target:'target2'})
    And the html:

    Code:
    <html>
    <head></head>
    <body>
    
    <div id="target1">T1</div>
    <br>
    <div id="target2">T2</div>
    
    </body>
    </html>

    I don't know what to put in the part in bold to set the click event listener and have it call function4 within the functiontest object. I've tried a bunch of different things and nothing worked. Please help, thanks!

  2. #2
    Join Date
    Mar 2010
    Posts
    11
    I could do something like:

    document.getElementById(this.t).addEventListener('click',function(evt){var tmp=new functiontest();tmp.function4(this.t)},false)
    and that works, but there's got to be a better way to do it. Any help is appreciated, thanks!

  3. #3
    Join Date
    Mar 2010
    Posts
    11
    Any ideas?

  4. #4
    Join Date
    Jan 2011
    Posts
    234
    I'm sure I don't understand what you are trying to do at all
    but in case that you are asking if it's possible to add event listeners to native JS objects -I'll have to say "not".
    Only DOM elements can.

    What is your primary goal?

  5. #5
    Join Date
    Jul 2003
    Location
    The City of Roses
    Posts
    2,544
    I think the problem is that the value of "this" will vary depending on the context of the function being executed. In the case of a listener, "this" will be the event's target, which in this case will be a DIV element.

    What you'll need to do is, outside of the listener callback, save the value of "this" in another variable.

    Code:
    var that = this;
    
    gebid(this.t).addEventListener('click', function () {
        that.uid.function4(that.t);
    }, false);
    Once you get past that hurdle, you're likely to run into another problem with this line:

    Code:
    that.uid.function4()
    The method "function4" belongs to the that/this object, not to the uid property.
    for(split(//,'))*))91:+9.*4:1A1+9,1))2*:..)))2*:31.-1)4131)1))2*:3)"'))
    {for(ord){$i+=$_&7;grep(vec($s,$i++,1)=1,1..($_>>3)-4);}}print"$s\n";

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