Reply To: CSS transitions don't work on newly appended elements.

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Don’t know if you figured this out yet…

If you want to name the function, define it elsewhere and reference the name:

function phoneCheck(){ 
    /*  stuff here  */ 
}
$(document).on( 'input', '.phone', phoneCheck );

otherwise, make it an anonymous function:

$(document).on( 'input', '.phone', function(){
    /* do phoneCheck stuff  */
} );