Simple calculation with one variable - Help needed

[cyberhack]

Hello!

I m new here and also not a programmer. But i try to write a little JS for a website..
This little script should be able to divide something. For this i wrote the following:

<script type="text/javascript language="JavaScript">
function compute() {
var divid = document.forms.divide.divident.value;
var operator = document.forms.operator.value;
document.forms.divide.quotient.value = divid / operator;
}

</script>
<form name=divide action="javascript:compute();">
<input type=text name=divident size=5 maxlength=5>
<select name="operator">
<option value="10">10 % </option>
<option value="15">15 % </option>
<option value="20">20 % </option>
</select>
<input type=text name=quotient size=6 maxlength=6>
<input type=submit value="Berechnen">
<input type=reset value=Reset>
</form>

... but it doesnt work. Whats wrong? Please help me to solve this.

Best regards

Chris

[acoder]

Welcome to The Scripts.

The problem is that you are trying to access 'operator' incorrectly. Try

var operator = document.forms.divide.operator.value;

You forgot the name of the form 'divide'.

PS: You could achieve the same functionality without a submit button, using a simple button and calling compute() in the onclick event handler.

[cyberhack]

Welcome to The Scripts.

The problem is that you are trying to access 'operator' incorrectly. Try

var operator = document.forms.divide.operator.value;

You forgot the name of the form 'divide'.

PS: You could achieve the same functionality without a submit button, using a simple button and calling compute() in the onclick event handler.

Hello acoder!

Thank yo very much, i tryed your solution and it works!
But now i realised that i have the wrong thinkings about what the script
should do :-(

It should to calculate a percentage of the "divident"

An example:

@ Divident (1st field) the user wrote 10000 and select 10 %...
the calculation must be result in 1000...

if the user wrote 10000 and choose 20% it results in 2000 and so on...

Whats my error in thinking? Would you so pleased and correct my code
that it works in the scheme above? And also i want to know what i must do that the user can only type numbers and no letters in the fields....
But.. im not a programmer... bad bad...

Thank you very much!

Best regards

Chris

<script type="text/javascript language="JavaScript">
function compute() {
var divid = document.forms.divide.divident.value;
var operator = document.forms.divide.operator.value;
document.forms.divide.quotient.value = divid / operator;
}

</script>
<form name=divide action="javascript:compute();">
<input type=text name=divident size=5 maxlength=5>
<select name="operator">
<option value="10">10 % </option>
<option value="15">15 % </option>
<option value="20">20 % </option>
</select>
<input type=text name=quotient size=6 maxlength=6>
<input type=submit value="Berechnen">
<input type=reset value=Reset>
</form>

[acoder]

That's quite simple. Just change the values in the select box to "0.something", e.g. change 10 to 0.1, 20 to 0.2, etc.

Then change the division to a multiplication:

document.forms.divide.quotient.value = divid * operator;