calculation order

[yunise]

i don't know how to write the script for calculate the total for price value multiply quantity value. the value is not type in is selected from the drop down list. thanks.

=======

<SCRIPT LANGUAGE="JavaScript">

function calculate(stage2, quantity)
{var stage = temp.options[temp.selectedIndex].value;
var quant = quantity.options[quantity.selectedIndex].value;
var result.value = eval(quant * stage);}

</SCRIPT>

</p>
<form name="doublecombo">
<p>
<select name="example" size="1" onChange="redirect(this.options.selectedIndex)">
<option>event001</option>
<option>event002</option>

</select>
<select name="stage2" size="1">
<option value="300">RM 300</option>
<option value="200">RM 200</option>
</select>
<select name="quantity" size="1">
<option value="1">1</option>
<option value="2">2</option>

</select>
<input name="calculate" type="button" id="calculate" onChange="calculate(stage2, quantity)" value="calculate" >
<input type=TEXT name="result">
</p>

<script>

var groups=document.doublecombo.example.options.length
var group=new Array(groups)
for (i=0; i<groups; i++)
group[i]=new Array()

group[0][0]=new Option("RM 300")
group[0][1]=new Option("RM 200")

group[1][0]=new Option("RM 150")
group[1][1]=new Option("RM 80")

var temp=document.doublecombo.stage2

function redirect(x){
for (m=temp.options.length-1;m>0;m--)
temp.options[m]=null
for (i=0;i<group[x].length;i++){
temp.options[i]=new Option(group[x][i].text,group[x][i].value)
}
temp.options[0].selected=true
}

function go(){
location=temp.options[temp.selectedIndex].value
}
//-->

</script>
</p>
</form>

[Dan Drillich]

One thing that you have to change is -


<input name="calculate" type="button" id="calculate" onChange="calculate(stage2, quantity)" value="calculate" >


The input text field and the function can't have the same name.

[yunise]

i alr change it but still have not work. i have try a way to do the calculation . is work but the double combo did not work y?

<SCRIPT language="JavaScript">
<!--
function run_cal()
{
var numb1=calc.num1.value;
var numb2=calc.num2.value;
var the_ans=numb1*numb2;
document.calc.total2.value=the_ans;
}
//-->
</SCRIPT>



<P>
<FORM name="calc">
<p>Event Name:
<select name="example" size="1" onChange="redirect(this.options.selectedIndex)">
<option>event001</option>
<option>event002</option>
</select>
Price :
<select name="num1" id=select size="1">
<option value="300">RM 300</option>
<option value="200">RM 200</option>
</select>
Quantity :
<select name="num2" id= num2 size="1">
<option value="1">1</option>
<option value="2">2</option>

<input name="button" type="button"
onClick="run_cal()" value="total">
Total : RM
<input type="text" name="total2" size="10">
</p>

<script>

var groups=document.calc.example.options.length
var group=new Array(groups)
for (i=0; i<groups; i++)
group[i]=new Array()

group[0][0]=new Option value("RM 300")
group[0][1]=new Option value("RM 200")
group[0][2]=new Option value("RM 100")

group[1][0]=new Option value("RM 150")
group[1][1]=new Option value("RM 80")

var temp=document.calc.num1

function redirect(x){
for (m=temp.options.length-1;m>0;m--)
temp.options[m]=null
for (i=0;i<group[x].length;i++){
temp.options[i]=new Option(group[x][i].text,group[x][i].value)
}
temp.options[0].selected=true
}

function go(){
location=temp.options[temp.selectedIndex].value
}
//-->
</script>
<P>&nbsp;
</FORM>