Or simply:
function calc(thevalue){
thevalue = thevalue * 1;
if (isNaN(thevalue)) {
thevalue = 0;
alert(thevalue);
}
}
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Question
Calculation Function
I'm trying to calculate some fields using an onchange event. If a field is blank, I want javascript to interpret it as a zero to use in a calculation, but I can't figure out what I'm doing wrong. Here is my function:
function calc(thevalue){
if (thevalue = "" || isNull(thevalue)) {
thevalue == 0
alert(thevalue)
}
}
Thanks!
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Answers
I have a follow up queston and I'm glad to add more points to this question to get an answer...based on the answer given above, I have the following two functions:
I only want the calculate functon to execute if the checkit function is false, otherwise, I want the functions to stop executing and the focus to return back to the field that is not valid. Does that make sense?
The line that I'm calling these funcitons looks like this:
onchange="checkit(this.val
Thanks.
function checkit(thevalue){
if (thevalue > 5 || thevalue == 0) {
alert("The value you have entered is not valid")
}
}
function calculate(prefix, thenumber){
field1 = document.getElementById(pr
if (field1 == "" || isNaN(field1)) {
field1 = 0
}
field2 = document.getElementById(pr
if (field2 == "" || isNaN(field2)) {
field2 = 0
}
}
mgh_mgharish has done the right thing by calling the calculate function from the checkit function. But you can also just put it all in one function. (Also get around 1 or 2 extra problems you might have had as well with getElementById() ):
function checkit(_prefix,_thevalue)
{
if (_thevalue > 0 && _thevalue < 6)
{
var field1 = document.getElementById(_p
var field2 = document.getElementById(_p
var fv1 = field1.value;
var fv2 = field2.value;
if (fv1 == "" || isNaN(fv1))
fv1 = 0;
if (fv2 == "" || isNaN(fv2))
fv2 = 0;
field1.value = fv1;
field2.value = fv2;
}
else
alert("The value you have entered is not valid");
}
onchange="checkit('dar',th
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by: mgh_mgharishPosted on 2006-08-18 at 09:47:28ID: 17343885
function calc(thevalue){
if (thevalue == "" || isNull(thevalue)) {
thevalue = 0
alert(thevalue)
}