Question

Usually they make another thing: enable/disable text input field when checkbox checked/unchecked, but i need enable group of checkboxes (weekdays) only when user entering some text in text field (Start date). So checkboxes must still disable while user not type Start date in input field.

I think that I need back action than here: http://jsfiddle.net/H8VPY/11/

Please help me choose right jquery event.

Answer 1

You can use prop() method and keyup event handler. Try the following:

$('input[name=other_name]').keyup(function(){
    if (this.value.length > 0) {
       $('input[name="others"]').prop('disabled', false)
    } else {
       $('input[name="others"]').prop('disabled', true)      
    }
})

DEMO

or as Esailija correctly suggests you can use shorter version:

$('input[name=other_name]').keyup(function(){
     $('input[name="others"]').prop('disabled', !this.value.length)
})