How to validate textarea before clicking submit?
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Validate textarea when clicking submit
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JavaScript validation for empty input field
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jQuery Validate - Enable validation for hidden fields
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Textarea CSS issue on "needs moderator attention"
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Rendering HTML inside textarea
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How to omit form's validation at AJAX button click?
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RequiredIf Conditional Validation Attribute
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Invalid postback or callback argument.  Event validation is enabled using ''
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Character limits on textarea fields - pros and cons and best practices?
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Prevent form submission on Enter key press
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Keep p:dialog open when a validation error occurs after submit
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How do I make a div element editable (like a textarea when I click it)?
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JavaScript: client-side vs. server-side validation
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Highlight text inside of a textarea
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Is there a way to perform validation for apex:inputField?
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jQuery validate: How to add a rule for regular expression validation?
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how to disable drop text inside a textarea?