js javascript

javascript.js

// load script after end load DOM
 function downloadJSAtOnload() {
				var element = document.createElement("script");
				element.src = "defer.js";
				document.body.appendChild(element);
			/*	
   $("div.container-loader").removeClass('hidden');
				$.get( "./temporal.php", function( data ) {
					$("#myCarousel").carousel("pause").removeData();
					$('[class^="carousel-"]').removeClass('hidden');
					$("div.epe-carousel").html(data);
					$("div.container-loader").addClass('hidden');
					$('#myCarousel').carousel();
				});
   */
 }
	if (window.addEventListener)
	 window.addEventListener("load", downloadJSAtOnload, false);
	else if (window.attachEvent)
	 window.attachEvent("onload", downloadJSAtOnload);
	else 
	 window.onload = downloadJSAtOnload;
	
// delete empty in array
existence.filter(Boolean)
existence = existence.filter(x => !!x);
existence[index] = null;

//convert string to array
var array = JSON.parse("[" + $("input#parameters").val() + "]");


//count the number of element of same class in a div?
$('#main-div .specific-class').length

//otherwise with plain js (from IE8 included) you could simply write
document.querySelectorAll('#main-div .specific-class').length;

// Check #x
$( "#x" ).prop( "checked", true );
 
// Uncheck #x
$( "#x" ).prop( "checked", false );

$('#myCheckbox').attr('checked', true); // Checks it
$('#myCheckbox').attr('checked', false); // Unchecks it

$('div.section.filter:eq(1) input[type="checkbox"]').prop( "checked", true );
$('div.section.filter:eq(1) input[type="checkbox"]').each(function() {
  $(this).prop( "checked", false );
});

/* check if jquery has been loaded, then load it if false */
<script>
if(!window.jQuery)
{
   var script = document.createElement('script');
   script.type = "text/javascript";
   script.src = "path/to/jQuery";
   document.getElementsByTagName('head')[0].appendChild(script);
}
</script>

/* native selector*/
document.querySelector(".example");
var element = document.querySelector("input[name=" + errors[i].name);

/*native selector checkbox*/
 var creditCards = document.querySelectorAll("input[name=creditCard]");
 for (var i = 0; i < creditCards.length; i++) {
  creditCards[i].checked = false;
 }