Form Processing
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- Validating Radio Buttons
How to validate radio buttons using Javascript.- Validating Single Radio Buttons
Dynamically generated lists of radio buttons may have only one listed.
- Validating Single Radio Buttons
- Validating a Text Field
A series of different tests that you can apply to validate a text field.- Text Field Validation Tutorials
A series of tutorials that take you step by step through a range of different validations that you can perform on text fields.
- Text Field Validation Tutorials
- Copying from a Drop Down List
How to set up a field value based on the entry selected in a drop down list.
- Limiting Textarea Text
Restricting how much text can be entered into a textarea.
- Dynamic Dropdown Boxes
Dynamically setting up values in a second drop down box depending on the entry selected in a first.- More Dynamic Dropdown Boxes
Copying entries between two dropdown boxes. - Multiple Dynamic Dropdown Boxes
Dynamically setting up values in a second and third drop down box depending on the entry selected in a first. - Dynamic Dropdown Box from Selected Image
Dynamically setting up values in a drop down box depending on which of several images is selected. - Dynamic Dropdowns with Multiple Forms
How to create dynamic dropdown lists in multiple forms on the same page. - Cascading Dynamic Dropdown Boxes
How to modify the function so that it will work with multiple levels of selection.
- More Dynamic Dropdown Boxes
- Keeping Entered Values when Reporting an Error
How to stop the values already entered into a form from being cleared when reporting an error.
- Dynamic Text Boxes
Making a text box appear or disappear depending on the value selected in another field.- Dynamic Page Content
Making part of the page appear or disappear depending on which radio button is selected. - Keeping Dynamic Page Content Visible
Correcting errors in when dynamic content appears and disappears.
- Dynamic Page Content
- Validation on Submit
How to validate the content of a form before the form action is performed.
- Clearing or Highlighting Default Text
How to automatically clear or highlight default text when a visitor goes to a field.
- Counting Words
How to count the number of words that have been entered into a textarea.
- Disable the Enter Key
How to make your page ignore the enter key
- Restricting Field Input
How to restrict which characters can be entered into a field.
- Dynamic Text Box Areas
Dynamically resizing a text box to suit the content.
- Credit Card Validation
Checking if a credit card number is valid.
- Selecting Today's Date
Providing Date selection lists with today's date selected.
- Removing Leading/Trailing Blanks
Removing the leading and trailing blanks from an input field.
- Unselecting a Selection?
Unselecting the selected item in a drop down list.
- Automatic Tabbing
Automatically moving to the next field when a fixed amount of data has been entered.
- Basic Field Validation
A few simple routines to do basic field validation.
- Validating Forms
Lots of pages on this site about validation - find them all from here.
- Validating Drop Down Lists
How to validate that the top entry in a dropdown list is not selected.
- Counting Selected Entries in a Drop Down List
How many entries have been selected in a drop doewn list where multiple selections are permitted?
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