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PHP Tutorial: How To: Keep Form Data After Submission [Quick Tip]
Video about validating form data using hidden fields:
You can set an 'onchange' attribute when adding or creating the select element: This can be used by templates, widgets, validators as needed for comparison, for example Rendering To render a field, simply call it, providing any values the widget expects as keyword arguments. If you have to use hidden fields, there are some rules: It will be non-selectable if you're using an html editor. An input that has a valid value will get the class valid, if the value is invalid the input will get the class error. Like blacklists, this approach requires maintenance and is usually incomplete.
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