JavaScript webpage

Question

I am having trouble debugging my JavaScript webpage. Where I am having difficulty is where I marked (...). I get errors of undefined. Do I place my parameters from my function countDown(start, increment) which are start and increment into (...)?

<dl>
startNum:&nbsp;&nbsp;<input type="text" id="<!-- (...) -->"/>
countBy:&nbsp;&nbsp;<input type="text" id="<!-- (...) -->"/>
<br/>
<input type="button" value="Run Function" onClick="onClickFunc5()" />
<script>
   function onClickFunc5()
   {
      var startNum = document.getElementById('<!-- (...) -->').value;
      var countBy = document.getElementById('<!-- (...) -->').value;

      <!-- countDown(start, increment) -->
      <!-- (...) -->
   }
</script>

Its just to show where I am having trouble with, so that it is easier to clearly see. — Robben
– Robben, Commented Dec 1, 2014 at 20:38
no it does not make it clearer! In fact, you made it worse. Show the actual code. Nowhere in the code do you define start and increment. Where do you set their values? Did you actually mean to use startNum and countBy? — epascarello
– epascarello, Commented Dec 1, 2014 at 20:39

RobPio · Accepted Answer · 2014-12-01 20:40:12Z

2

I would try this:

startNum:&nbsp;&nbsp;<input type="text" id="startInput"/>
countBy:&nbsp;&nbsp;<input type="text" id="countByInput"/>
<br/>
<input type="button" value="Run Function" onClick="onClickFunc5()" />
<script>
   function onClickFunc5()
   {
      var startNum = document.getElementById('startInput').value;
      var countBy = document.getElementById('countByInput').value;

      <!-- countDown(startNum, countBy) -->
      <!-- (...) -->
   }
</script>

Did you create the countDown function yourself or is it part of a plugin that you want to use? You may not be including the plugin that you need.

Also, you never closed the dl tag

edited Dec 1, 2014 at 20:40

answered Dec 1, 2014 at 20:28

RobPio

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7 Comments

Robben Over a year ago

Yea, I created the countDown function myself. And I closed the tags at the end but didn't include it in my question since it will be too cluttered and long. The trouble I was having was defining the id. And why place startInput instead of start? And what happenes to the the last (...)?

alex Over a year ago

@Robben Nothing happens to the last (...); it's a comment in the code. It's good practice to make sure that every element in the HTML has a unique ID.

RobPio Over a year ago

Oh, I see. Do this: countDown(startNum, countBy);

Robben Over a year ago

Thanks for the help! I will edit my code and try to run it again to see if it will work now.

RobPio Over a year ago

You may have to use the parseInt() function to make sure that your parameters in the countDown function are integers. w3schools.com/jsref/jsref_parseint.asp

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