JS Validation on extended WP object forms

[sc0ttkclark]

Discussed in #6611

^{Originally posted by ghost October 29, 2014}

Tasks

• Look into pulling our existing JS form validation code that we use on ACT forms
• On WP forms, call JS function/method once page loads that hooks into validation
• Form: Post editor (classic editor)
• Form Validation: Post editor (block editor) #7343
• Form: Term add new (if possible)
• Form: Term edit
• Form: User edit
• Form: Media edit (if possible)
• Form: Commend edit
• Form: Comment add new in theme (if possible)

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Original message:

When an input is not valid, like blank input for a required field, letters in a number only field, can we have the validation message on the same page rather than going to another page to see the error message and then come back. Because if I click the back button to do the amends, I'm actually creating another page rather than editing the page I've worked on.

Thanks.

[sc0ttkclark]

Related: #5484 #2424 #6611