javascript if statement condition replacing variable value

Question

I'm new to Javascript.

I have a script with lots of calculations. Everything is working great except I have a variable called J14 and the user is able to set this value from the interface. Lets say it equals 30000 for now. It seems to work through the calculations but as soon as I use J14 in an If statement condition, it replaces the value of J14 with 0. I have no idea why it would do this as I'm not assigning the variable, I'm simply checking it against 0.

Before this statement I can output the value of J14 and it's 30000 as expected, however, if I output J14 after this statement it's value is 0. So the condition is assigning the value. I can then no longer use J14 in the script but I need to use it in the If statement following this one. I probably have syntax error for doing this kind of thing but can't quite figure out the terminology for a successful google for a solution.

if (J14 = 0)
{
    J59 = (J15 + J16) * 75;
}
else
{
    J59 = J15 * F75;

}

Bernhard Hofmann · Accepted Answer · 2012-09-04 10:13:36Z

4

= is an assignment. You should use == or better yet, ===.

answered Sep 4, 2012 at 10:13

Bernhard Hofmann

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1 Comment

Ultraflash Over a year ago

You know I nearly did that but didn't find it as an option on the site I used as a tutorial, it only had others such as != <= etc etc but no ==. I should have known from other programming languages I've used.

Endy · Accepted Answer · 2012-09-04 10:13:43Z

2

You are assigning 0 to the variable. = is used for assignment. You need to use '=='.

answered Sep 4, 2012 at 10:13

Endy

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Comments

Vishal Suthar · Accepted Answer · 2012-09-04 10:15:37Z

1

= is an Assignment Operator.

== is Comparison Operator

if (J14 = 0)   //will assign 0 to J14

answered Sep 4, 2012 at 10:15

Vishal Suthar

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