Detecting NULL with actionscript

kidreapertronV · December 2nd, 2009, 05:01 PM

Hello all,

I'm very very new to actionscript and am trying to troubleshoot a problem with a little research, but so far I've hit a wall.

I want to detect when a value is null and cause it to do one thing, and if it is not null, to do another.

This is the original code (the url_txt.htmlText is the focus of my problem):

Code:

function clickHandler3(evt:Wall3DEvent):void{title_txt.text = " ";
desc_txt.text = " ";
url_txt.htmlText = "";
inLargeImage = false;
trace("Disabling text");
mySource = "";
myURL = "";

close_btn.visible = false;
}

wall.addEventListener(Wall3DEvent.ELEMENT_DESELECTED,clickHandler3);



function clickHandler2(evt:Wall3DEvent):void{

    title_txt.text = evt.element.getUserProperty("title");
    desc_txt.text = evt.element.getUserProperty("description");
    url_txt.htmlText = "<a target="+'"_blank"'+" href="+"'"+"http://"+(evt.element.getUserProperty("url"))+"'"+">"+(evt.element.getUserProperty("url"))+"</a>";
    inLargeImage = true;
    myURL = evt.element.getUserProperty("url");
    mySource = evt.element.src;
    trace("Showing Large Image and text.");
    
    wall.addEventListener(Wall3DEvent.CAMERA_MOVEMENT_COMPLETE, zoomComplete);
}
wall.addEventListener(Wall3DEvent.ELEMENT_SELECTED,clickHandler2);

This is what I tried:

Code:

function clickHandler3(evt:Wall3DEvent):void{title_txt.text = " ";
desc_txt.text = " ";
url_txt.htmlText = "";
inLargeImage = false;
trace("Disabling text");
mySource = "";
myURL = "";
  
close_btn.visible = false;
}

wall.addEventListener(Wall3DEvent.ELEMENT_DESELECTED,clickHandler3);



function clickHandler2(evt:Wall3DEvent):void{

    title_txt.text = evt.element.getUserProperty("title");
    desc_txt.text = evt.element.getUserProperty("description");if (url_text.htmlText != ""){    url_txt.htmlText = "<a target="+'"_blank"'+" href="+"'"+"http://"+(evt.element.getUserProperty("url"))+"'"+">"+"View Site"+"</a>";
} else {url_txt.htmlText = "";
}
inLargeImage = true;
    myURL = evt.element.getUserProperty("url");
    mySource = evt.element.src;
    trace("Showing Large Image and text.");
    
    wall.addEventListener(Wall3DEvent.CAMERA_MOVEMENT_COMPLETE, zoomComplete);
}
wall.addEventListener(Wall3DEvent.ELEMENT_SELECTED,clickHandler2);

Any suggestions?

Thanks!