⛔️ Nice client-side live form validation for Nette Forms.
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Live Form Validation

⛔️ Nice client-side live form validation for Nette Forms 2.4.

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npm install --save live-form-validation


All you need is to link live-form-validation.js file from to your HTML document. That's it!

The script already contains the netteForms.js file, so don't use it again and remove it from your HTML document.


  • Dev: https://rawgit.com/contributte/live-form-validation/master/live-form-validation.js
  • Stable: https://cdn.rawgit.com/contributte/live-form-validation/v1.8.1/live-form-validation.js


State Version Branch
development ^1.9.0 master
stable ^1.8.1 master


Script by default works nicely with Twitter Bootstrap 3, but you can customize the options to fit your exact needs.


You can change default options by calling LiveForm.setOptions({ ... }); after including the script. Give only options that you want to change. For example:

<script src="/js/live-form-validation.js"></script> 
		messageErrorPrefix: 'Error: ',
		wait: 500

Alternatively, if you want to set options before the script is loaded, create LiveFormOptions = { ... }; with options that you want to change. For example:

	LiveFormOptions = {
		messageErrorPrefix: 'Error: ',
		wait: 500
<script src="/js/live-form-validation.js"></script> 

Available options

Option Description
showMessageClassOnParent CSS class of control's parent where error/valid class should be added; or "false" to use control directly
messageParentClass CSS class of control's parent where error/valid message should be added (fallback to direct parent if not found); or "false" to use control's direct parent
controlErrorClass CSS class for an invalid control
controlValidClass CSS class for a valid control
messageErrorClass CSS class for an error message
enableHiddenMessageClass control with this CSS class will show error/valid message even when control itself is hidden (useful for controls which are hidden and wrapped into special component)
disableLiveValidationClass control with this CSS class will have disabled live validation
disableShowValidClass control with this CSS class will not show valid message
messageTag tag that will hold the error/valid message
messageIdPostfix message element id = control id + this postfix
messageErrorPrefix show this html before error message itself
showAllErrors show all errors when submitting form; or use "false" to show only first error
showValid show message when valid
wait delay in ms before validating on keyup/keydown; or use "false" to disable it
focusScreenOffsetY vertical screen offset in px to scroll after focusing element with error (useful when using fixed navbar menu which may otherwise obscure the element in focus); or use "false" for default behavior

Special features

  • Form on load validation - Adding class validate-on-load to form element will execute its validation immediately after page is loaded.


You can edit/replace methods LiveForm.addError (shows error message), LiveForm.removeError (hides error message), LiveForm.showValid (show message if input is correctly filled), LiveForm.setupHandlers (sets handlers up for inputs, like focus, blur, onkeyup). These methods can be altered to support some JS framework, ie. jQuery.


Milan Felix Šulc


This script is based on work of Robert Pösel, zakrava, Radek Ježdík, MartyIX and David Grudl.

Thank you all!

Robert Pösel


Radek Ježdík

Martin Vseticka

David Grudl

Thank you for testing, reporting and contributing.