javascript - compute data from an array -

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i have (simple) question regarding array. trying total of board-feet entered in html. here's running sample code: click here

(thanks askaiser code).

now, want everytime click go button, automatically compute total board-feet being entered in array. so, everytime input in form , clicked go, data go array , total of board-feet displayed in input box below. change add data array.

i can't work , have nan value total.

see this: http://jsfiddle.net/ghostoy/8xffh/195/


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