Q48 How do I sum form field values together?

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Because form field values are always strings it is necessary to convert them to numbers before summing them. For example if you do:

var a = '1';
var b = '2';

var c = a + b;

Then the variable c would contain '12'.

The Netscape recommended solution is to do the following:

var a = '1';
var b = '2';

var c = (a-0) + (b-0);

Now the variable c would contain '3'.

©2018 Martin Webb