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POhow do i add or increase a numeric value in an input text field?
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copied!<p>i'm using this jquery calculation plugin: <a href="http://www.pengoworks.com/workshop/jquery/calculation/calculation.plugin.htm" rel="nofollow">http://www.pengoworks.com/workshop/jquery/calculation/calculation.plugin.htm</a></p> <p>i'm using the sum example.</p> <p>in my version, i'm dynamically inserting values into fields and recalculating and all works well, but so far i have just been inserting new values into empty fields.</p> <p>now in a separate action i want to increase the value of one of the fields that has been previously filled by a value and then recalculate again.</p> <p>i setup a fiddle with what i'm trying to do.</p> <p><a href="http://jsfiddle.net/rEQnY/1/" rel="nofollow">http://jsfiddle.net/rEQnY/1/</a></p> <p>there's a dropdown with options. each option has a numeric value.</p> <p>now as an example lets just pick a field at random. lets say that 3rd field that has a number "1" in it.</p> <p>when i select one of the dropdown values, i want that 3rd field with a number 1 in it to increase by that much, and then the total sum box should also increase by that much.</p> <p>in the javascript i started with listening to a change in the dropdown box, but what do i insert in between there?</p> <p>maybe i can grab the selected value like this:</p> <pre><code>$('#numbers').val(); </code></pre> <p>but then how do i add it to the other field?</p> <p>update:</p> <p>how do i fix this new version?</p> <p><a href="http://jsfiddle.net/rEQnY/8/" rel="nofollow">http://jsfiddle.net/rEQnY/8/</a></p> <p>i want 2 different fields to add value to another field.</p> <p>if dropdown 1 (by itself) adds 2 to 3rd input text box, 3rd input text box should become 3.</p> <p>if dropdown 2 (by itself) adds 2 to 3rd input text box, 3rd input text box should become 3.</p> <p>if 2 is selected in both dropdowns, then 4 should be added to 3rd input text box and become 5.</p> <p>if either dropdown 1 or dropdown 2 is reset, meaning "pick one" is selected, then the 3rd input text box should be subtracted by 2, making it 3.</p> <p>as you can see in my example, only one dropdown adds to the field. can be either or, but not both. i want both to be able to add to it and take away from it when the default "pick one" is selected.</p>

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