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JavaScripts :: Parsing Form Values


The form's method must be set to POST, not GET nor PUT.


Microsoft's Internet Explorer 6 and 7 limit the length of URLs to around 2080 characters. Internet Explorer 5 limited them to around 1024 characters. Mozilla Firefox has a much greater limit, we tested up to 6,500 characters with success. As such, this script is ideal for passing variables from one page to the next, or for parsing short forms.

Buy this code with sample forms for just $20

ParserJS is a JavaScript that will read an entire form, append the key/value pairs to a query string, then parse the key values pairs on the next page. The number and type of elements in your form and the data entered, does not matter. All form field types are supported (hidden, select-one, select-multiple, radio, checkbox, text, textarea, file). Lines breaks in textareas, quotes and metacharacters are all preserved and available on the next page. File upload fields show the value entered (file:C:\Documents and Settings\filename.gif), and not the file data.

Form fields do not have to be known or defined, ParserJS parses the entire form and is accessible via an array on the subsequent page.

Some example uses of displaying form data on the subsequent page:

	document.write("Your are aged: " + FORM['age']);

	document.getElementById('nameDiv').innerHTML = FORM['firstname'];

	document._form.lastname.value = FORM['lastname'];

// -->
Data storage
Select menus with multiple options selected will be stored in the FORM array as a comma separated list, as in : Option 2,Option 4
Regular select menus will store only the selected option in the FORM array
Radio buttons, which can only have one option selected, will generate a key/value pair for the selected option.
Checkboxes will generate key/value pairs if the checkbox is ticked.

Hidden fields, text fields, file upload fields and textareas will generate a key/value pair for each field. All will correctly encode and preserve all metacharacters and line breaks in the subsequent form. Metacharacters include: ', ", :, \, /, \n, ? etc.
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