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JavaScript Code Animation Problems

Posted on 2009-03-30
2
Medium Priority
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Last Modified: 2012-05-06
I am having issues with a homework problem. I am being asked to move a golf ball using javascript. So far I have been unsuccessful. Here is my code; any suggestions?

Thank you so much for your help.





<title>The Golf Page</title>
<link href="styles.css" rel="stylesheet" type="text/css" />
<script src="golf.js" type="text/javascript"></script>
<script type="text/javascript">


var x = new Array(-395, -389, -383, -377, -371, -365, -359, -353, -346,
-340, -334, -328, -322, -316, -310, -304, -297, -291, -285, -279, -273,
-267, -261, -255, -248, -242, -236, -230, -224, -218, -212, -206, -199,
-193, -187, -181, -175, -169, -163, -157, -150, -144, -138, -132, -126,
-120, -114, -108, -101, -95, -93, -91, -88, -86, -83, -81, -78, -76, -73,
-71, -69, -66, -64, -61, -59, -56, -54, -51, -49, -47, -44, -42, -39, -37,
-34, -32, -29, -27, -24, -22, -20, -17, -15, -12, -10, -7, -5, -2, 0);

var y = new Array(-300, -300, -300, -299, -298, -297, -296, -294, -292,
-290, -288, -285, -282, -279, -276, -272, -268, -264, -260, -255, -250,
-245, -240, -234, -228, -222, -216, -209, -202, -195, -188, -180, -172,
-164, -156, -147, -138, -129, -120, -110, -100, -90, -80, -69, -58, -47,
-36, -24, -12, 0, -5, -10, -14, -18, -22, -25, -29, -32, -34, -37, -39,
-41, -43, -45, -46, -47, -48, -48, -48, -48, -48, -48, -47, -46, -45, -43,
-42, -40, -37, -35, -32, -29, -26, -23, -19, -15, -11, -6, 0);

var index = 0;
var l     = x.length;

// alert(l); - used for debugging  
function moveBall(){
       if(index <= l-1 ){
           placeIt("ballDOMID",x[index], y[index]);
            index++; // increase it to point to next location
          setTimeout("moveBall()", 5); // wait 5 milisec, and move again
      }
            else{
                  setFontSize("slogan",0);
                  showIt("slogan");
                  growText();
      }
}
function growText(){

      var fs = getFontSize("slogan");
     
      if(fs <= 20){
            changeFontSize("slogan",1)
          setTimeout("growText()", 20); // wait 20 milisec, and move again
      }

}
</script></head>

<body onload="moveBall();">

<div id="Golfer" ><img src="golfer.gif" width="40px" alt="" /></div>
<div id="Title">
THE G<span id="Ball"><img src="ball.gif" alt="O" /></span>LF PAGE
</div>

<div id="box"
style="">
<span id="slogan">
Your Online Source of Golf Equipment
</span>
</div>

</body>
</html>




function placeIt(id, x, y) {
   object=document.getElementById(id);
   object.style.left=x+"px";
   object.style.top=y+"px";
}

function showIt(id) {
   object=document.getElementById(id);
   object.style.visibility="visible";
}


function getFontSize(id) {
var object= document.getElementById(id);
return parseInt(object.style.fontSize);
}

function setFontSize(id,fs){
      object = document.getElementById(id);
      document.getElementById(id).style.fontSize=fs+"pt";
}
function changeFontSize(id, dfs){
var fs= getFontSize(id) ;
setFontSize(id,fs)=fs+dfs;
}
0
Comment
Question by:afreeland
2 Comments
 
LVL 12

Accepted Solution

by:
alien109 earned 2000 total points
ID: 24024970
I think you are supplying the wrong element ID in your moveBall function when calling placeIt.

placeIt("ballDOMID",x[index], y[index]);

should be:

placeIt("Ball",x[index], y[index]);

and

function changeFontSize(id, dfs){
var fs= getFontSize(id) ;
setFontSize(id,fs)=fs+dfs;
}

should probably be:

function changeFontSize(id, dfs){
var fs= getFontSize(id) ;
setFontSize(id,fs + dfs);
}


Make sure that the ball div's position property is set to absolute via css. And your values are all negative which would place it off the screen (unless you are doing something in the css file which would keep it on screen).
0
 

Author Closing Comment

by:afreeland
ID: 31564626
Thank you SO much! You are a life saver! I really appreciate your help!
0

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