Variable substitutions in JavaScript 1

[dove85]

function amt_check(form,field_name,amount)
{
.
.
some code to calculate newamt
.
.
if (field_name == "cost&quot
{
form.cost.innerText = newamt;
} else if (field_name == "unit_price&quot
{
form.unit_price.innerText = newamt;
} else if (field_name == "total_cost&quot
{
form.total_cost.innerText = newamt;
} else if ......
}


Is there a way to substitute the "field_name" in the assignment statements so that the above if/else statements would look like

form.??field_name??.innerText = newamt;


Your help would be appreciated.

Thanks.
Dove85

 

[theEclipse]

well, first of all, if would be much more compatible to use:

document.form.fieldname.value

innerText is not supported by older browsers




now, you could use:

document.form.elements[field_name].value
theEclipse
eclipse_web@hotmail.com
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[baad]

yeah, right

or use eval (pretty ugly when u can use elements array )
eval('document.forms.formname.'+fieldName+'.value=value')

or pass field like an object:

html :
~~~~~~~
..
<input type=&quot;text&quot; name=&quot;txt1&quot; onchange=&quot;validate(this)&quot;>
..
~~~~~~~

js:
~~~~~~~
..
function validate(object){
alert(object.value)
}
..
~~~~~~~ Victor