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Location: Gold Coast - Brisbane QLD, Australia
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Javascript is the most efficient way to construct interactive forms as opposed to server-side languages since JS runs on the client's side.
You need to read a few javascript primers on acquiring form values, manipulating that data, then outputting results to the browser.
Typically you begin by assigning all applicable form fields with a unique id name. The next step is to write a function which performs the neccessary tasks. It identifies the form values that will be included in the task, then manipulates those values; finally the function would output the resulting values to the browser.
There are millions of JS primers that will have you coding interactive forms in a few hours.
http://tinyurl.com/d7r6f
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