javascript - Check if text field is empty before executing jQuery -

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this might easy question, find confusing.

how run myfunc() if textfield_1 not empty?

excicute .on('click', '#openbutton', myfunc) if ($('#textfield_1').val()!="") ?

check inside handler:

.on('click', '#openbutton', function() {     if( !$('#textfield_1').val().trim().length ) myfunc(); //thanks @mike suggestion on trim , length, see comments })

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