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How to let HTML input text value from javascript function call return value?

Posted on 2009-05-04
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Last Modified: 2013-11-19
I have a HTML page with form and various input fields. However, the default value of some input fields should be calculated dynamically from return value of some java script. Also when the submit type button is clicked, all input fields should be validated before invoking the sever side PHP script. Could someone tell me how to do it? Thanks!
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Question by:gs_kanata
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HonorGod earned 400 total points
ID: 24301062
You are going to have to supply more information.  For example, what kind of fields, and what kind of validation.  It is quite common to see a form tag something like this:

When the submit button is clicked, the specified function (in this case validateFormOnSubmit() ) is called to check for valid values in each of the form elements.

If the values are acceptable, the function returns a value of true, and the action event will be used.  Otherwise a value of false is returned, and the user  is able to correct the issues.
<form name='myForm' onsubmit='return validateFormOnSubmit(this)' action='target.html'>

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Assisted Solution

by:bleach77
bleach77 earned 100 total points
ID: 24302295
Write a function that will change the value. Something like this:

document.myForm.txtbox.value = "New Value";

Call the function like HonorGod post. The javascript will change the value before submitting the form.
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LVL 41

Expert Comment

by:HonorGod
ID: 24408468
Thanks for the grade & points.  I'm sorry that you didn't feel the answer warranted an A.

Good luck & have a great day.
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