10 examples of 'document ready without jquery' in JavaScript

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jQuery(function ready() {
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		var node = $("#child"), name;
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		jQuery.each([".zoo", "#zoo", "[data-foo=zoo]", "#nonexistant"], function(i, item) {
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setTimeout(function(){
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				name = "find '" + item + "'";
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	jQuery("#results").append("<li>rooted " + name + "<ul>" +
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					"<li>new: " + benchmarkString("$('body').find('" + item + "')", 250, name) + "</li>" +
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					"<li>old: " + benchmarkString("old('body').find('" + item + "')", 250, name) + "</li>" +
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		"</ul></li>");
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}, 100);
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		});
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	});

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jQuery(function ready() {
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      var node = $("#child"), name;
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      jQuery.each([".zoo", "#zoo", "[data-foo=zoo]", "#nonexistant"], function(i, item) {
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	setTimeout(function(){
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        	name = "filter '" + item + "'";
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		jQuery("#results").append("<li>" + name + "<ul>" +
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        		"<li>new: " + benchmarkString("$('div').filter('" + item + "')", 100, name) + "</li>" +
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        		"<li>old: " + benchmarkString("old('div').filter('" + item + "')", 100, name) + "</li>" +
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			"</ul></li>");
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		jQuery("#results").append("<li>single " + name + "<ul>" +
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        		"<li>new: " + benchmarkString("$('#nonexistant').filter('" + item + "')", 1000, name) + "</li>" +
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        		"<li>old: " + benchmarkString("old('#nonexistant').filter('" + item + "')", 1000, name) + "</li>" +
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			"</ul></li>");
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	}, 100);
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      });
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    });

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jQuery(function ready() {
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		var node = $("#child"), name;
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		jQuery.each([".zoo", "#zoo", "[data-foo=zoo]", "#nonexistant"], function(i, item) {
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setTimeout(function(){
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				name = "closest '" + item + "'";
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	jQuery("#results").append("<li>" + name + "<ul>" +
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					"<li>new: " + benchmarkString("$('#child').closest('" + item + "')", 2500, name) + "</li>" +
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					"<li>old: " + benchmarkString("old('#child').closest('" + item + "')", 2500, name) + "</li>"
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		+ "</ul></li>");
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}, 100);
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		});
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	});

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jQuery(function ready() {
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		var node = $("#child"), dsName;
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		jQuery.each([".zoo", "#zoo", "[data-foo=zoo]", "#nonexistant"], function(i, item) {
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setTimeout(function(){
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				dsName = "find '" + item + "'";
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	jQuery("#results").append("<li>rooted " + dsName + "<ul>" +
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					"<li>new: " + benchmarkString("$('body').find('" + item + "')", 250, dsName) + "</li>" +
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					"<li>old: " + benchmarkString("old('body').find('" + item + "')", 250, dsName) + "</li>" +
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		"</ul></li>");
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}, 100);
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		});
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	});

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jQuery(function ready() {
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		var node = $("#child"), name;
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		jQuery.each([".zoo", "#zoo", "[data-foo=zoo]", "#nonexistant"], function(i, item) {
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setTimeout(function(){
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				name = "filter '" + item + "'";
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	jQuery("#results").append("<li>" + name + "<ul>" +
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					"<li>new: " + benchmarkString("$('div').filter('" + item + "')", 100, name) + "</li>" +
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					"<li>old: " + benchmarkString("old('div').filter('" + item + "')", 100, name) + "</li>" +
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		"</ul></li>");
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	jQuery("#results").append("<li>single " + name + "<ul>" +
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					"<li>new: " + benchmarkString("$('#nonexistant').filter('" + item + "')", 1000, name) + "</li>" +
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					"<li>old: " + benchmarkString("old('#nonexistant').filter('" + item + "')", 1000, name) + "</li>" +
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		"</ul></li>");
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}, 100);
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		});
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	});

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jQuery(function ready() {
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      var node = $("#child"), name;
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      jQuery.each([".zoo", "#zoo", "[data-foo=zoo]", "#nonexistant"], function(i, item) {
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	setTimeout(function(){
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        	name = "closest '" + item + "'";
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		jQuery("#results").append("<li>" + name + "<ul>" +
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        		"<li>new: " + benchmarkString("$('#child').closest('" + item + "')", 2500, name) + "</li>" +
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        		"<li>old: " + benchmarkString("old('#child').closest('" + item + "')", 2500, name) + "</li>"
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			+ "</ul></li>");
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	}, 100);
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      });
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    });

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function domReady(callback){
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	// TODO: support IE7-8
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	if(/e/.test(doc.readyState||'')){
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		// TODO: fix the issues with sync so this can be run immediately
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		setTimeout(callback, 200);
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	}else{
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		doc.addEventListener("DOMContentLoaded", callback);
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	}
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}

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function jqueryLoaded() {
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  django.jQuery(document).ready(function () {
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    if (!django.hasOwnProperty('unitsList')){
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      django.jQuery.ajax({
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        url: '/api/v1/courses/units',
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        success: function (data, status, jqXHR) {
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          django.unitsList = data
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        }
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      });
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    }
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  });
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}

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export function domReady(callback) {
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  readyCallbacks.push(callback)
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}

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function domReady(callback) {
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  const doc = document;
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  const attach = 'addEventListener';
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  if (doc[attach]) {
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    doc[attach]('DOMContentLoaded', callback);
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  } else {
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    window.attachEvent('onload', callback);
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  }
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}