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jQuery: How to check if the javascript function exist

To check if the javascript function is exist, we can check using typeof(). See example below:

jQuery(document).ready(function() {
	if(typeof $(".change-password").fancybox == 'function')  {
		$('.change-password').fancybox({
			'width' : '60%',
			'height' : 400,
			'transitionIn' : 'fade',
			'autoScale' : false,
			'transitionOut' : 'fade',
			'scrolling' : 'no',
			'type' : 'iframe',
			'href' : $(this).attr('href')
		});
	}
});
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