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Validate the maximum length of text in a textbox.
wf:wire(ButtonID, TextBoxID, #validate { validators=[<br>
#max_length { text="Maximum of 7 characters.", length=7 }<br>
]})
text
(string) - The text to display if validation fails.
length
(integer) - The maximum length of text.
* [Validate Action](validate.md)
* [Validation Demos](http://nitrogenproject.com/demos/validation)