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textbox evaluate (math) on load

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mjpearson

mjpearson

Technical User
Dec 13, 2002
196
US
I've inserted a textbox into my page and I want the text box to be preloaded with the results of a math equation. I tried the EVAL function but that didn't work.

<input type="text" name="S400" size="10" value=eval(25/10)>

Is this even possible? What is the proper syntax?


thanks,



mike
 
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But what you want is this (should work, I think)

<input type="text" name="S400" size="10" value="" onload="this.value = eval(25/10)">

If the onload doesn't work, put it in the body onload tag.

--Chessbot

"So it goes."
Kurt Vonnegut, Slaughterhouse Five
 
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I'm trying to be tricky....I have a device that provides hosting but only for very limited features. It is a real-time device that databases information so the numbers will change but the server isn't smart enough to do scripting so I have to do it in the client page.

As noted, the 25 is embedded in the page when it is sent to the client. I insert the string <--DATA 20,-1,1,%d --> and that will insert the 20th integer into the page in decimal format.

So, in reality, the line is supposed to look like this:


<input type="text" name="S400" size="10" value=eval(<--DATA 20,-1,1,%d --> / 10)>


 
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Here is your page:

Code: 
<html>
<head>
<title>Eval</title>
<script type="text/javascript">
<!-- hide

function init()
{
  // repeat for each element you need
  document.forms['a'].elements['S400'].value = <--DATA 20,-1,1,%d -->/10;
}

// end hide -->
</script>
</head>
<body onload="init();">
<form name="a">
<input type="text" name="S400" size="10" value="Error">
</form>
</body>
</html>

Initial value is "error" because if they see the value then your code has failed to execute for some reason.

--Chessbot

"So it goes."
Kurt Vonnegut, Slaughterhouse Five
 
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Perfect. That works great.

I had tried onLoad earlier but it didn't work. I figured the onLoad was called before the forms had arrived. Now I understand the the page fully loads before running the onLoad function. My earlier attempt might have been caused by my oversight in not including the ";" at end of my onLoad statement?

Thanks again,


mike
 
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The semicolon is only necessary to separate multiple functions in a row; it is not necessary for the last one.

--Chessbot

"So it goes."
Kurt Vonnegut, Slaughterhouse Five
 
Upvote 0 Downvote
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