javascript - Extjs Form Validation before Submit -

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I have an express form for which some assumptions are required, such that I enter letters rather than numbers, before I . How can I make it before entering a number in the field?

Try this:

  onFormSubmit: function (BTN, event) {Var me = this, form = btn.up ('form'). GetForm (); If (form.isValid ()) {// submit form} other alerts ('invalid form'); }