Programming Forums - simple multiply script

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simple multiply script

Hi all our teacher gave us this simple script that when someone gives two numbers in two forms then it will multiply their contents and print the result in an another form after he click one button.Here is the code:

<script language="javascript">

function convert (form)

{

   if ((form.first.value == "") 

       (form.second.value ==""))  

       return;

   form.result.value=form.first.value * form.second.value;     

}  

</script>

and

<form method="post">

Give first number:<input type="text" name="first" value=0 onchange=convert(this.form)>

<p>Give second number:<input type="text" name="second" value=0 onchange=convert(this.form)>

<p><input type="button" name="calculate" value="calculate" onclick=convert(this.form)>

<p>Result:<input type="text" name="result" value="not calculated" ><br>

</form>

I only tried in firefox and it didn't work.Any ideas?

You didn't copy it correctly. You're missing a logical operator between the two expressions in the "if". I didn't look beyond that. You could well get into conversion problems, auto conversion or not.

Yes i didn't copy it correctly.I was missing a logical "or" operator between the expressions of "if".Now it works :

<script language="javascript">

function convert (form)

{

   if ((form.first.value == "") ||

       (form.second.value =="")) 

       return;

   form.result.value=form.first.value * form.second.value;     

}  

</script>

and

<form method="post" >  

Give first number:<input type="text" name="first" value=0 onchange=convert(this.form)>

<p>Give second number:<input type="text" name="second" value=0 onchange=convert(this.form)></p>

<p><input type="button" name="calculate" value="calculate" onclick=convert(this.form)></p>

<p>Result:<input type="text" name="result" value="not calculated" ></p><br>

</form>

Sorry for the stupid post

it wasn't stupid...you fixed your problem.

oftentimes all you need is a fresh perspective.

good luck!