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Basic `script.readyState`/`document.readyState` tests
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <title>Basic `script.readyState`/`document.readyState` tests</title> | |
| <script id="loadFirst"> | |
| window.console && console && console.log && console.log("loadFirst script, evaluating first line"); | |
| function _write(msg) { | |
| var bod = document.body || document.getElementsByTagName("body")[0]; | |
| if (bod && (!("readyState" in document) || document.readyState === "complete")) { | |
| bod.innerHTML += msg; | |
| } | |
| else { | |
| document.write(msg); | |
| } | |
| } | |
| function _log(msg) { | |
| if (typeof console !== "undefined" && console && console.log) { | |
| console.log(msg); | |
| } | |
| } | |
| function getScriptIds(scriptEls) { | |
| var scriptIds = []; | |
| if (scriptEls) { | |
| for (var i = 0, len = scriptEls.length; i < len; i++) { | |
| scriptIds.push(scriptEls[i].id); | |
| } | |
| } | |
| return scriptIds; | |
| } | |
| function getReadyStates(scriptEls) { | |
| var scriptStates = []; | |
| if (scriptEls) { | |
| for (var i = 0, len = scriptEls.length; i < len; i++) { | |
| scriptStates.push(scriptEls[i].readyState); | |
| } | |
| } | |
| return scriptStates; | |
| } | |
| function toArray(nodeList) { | |
| try { | |
| return [].slice.call(nodeList); | |
| } | |
| catch (e) { | |
| var arr = []; | |
| if (nodeList) { | |
| for (var i = 0, len = nodeList.length; i < len; i++) { | |
| arr.push(nodeList[i]); | |
| } | |
| } | |
| return arr; | |
| } | |
| } | |
| function showState(name) { | |
| var scripts = toArray(document.getElementsByTagName("script")); | |
| var scriptCount = scripts.length; | |
| var output = []; | |
| output.push("<div><strong>[" + name + "] document.readyState:</strong> " + document.readyState + "</div>"); | |
| output.push("<div><strong>[" + name + "] scripts (" + scriptCount + ") IDs:</strong> " + getScriptIds(scripts).join(", ") + "</div>"); | |
| if (hasRSSupport) { | |
| output.push("<div><strong>[" + name + "] scripts (" + scriptCount + ") readyStates:</strong> " + getReadyStates(scripts).join(", ") + "</div>"); | |
| } | |
| for (var i = 0, len = output.length; i < len; i++) { | |
| _write(output[i]); | |
| } | |
| } | |
| function appendScriptReadyState(scriptNode) { | |
| return (hasRSSupport ? ", readyState:</strong> " + scriptNode.readyState : "</strong>") + "</div>" | |
| } | |
| function addScriptEventHandlers(scriptNode) { | |
| if (!scriptNode) { | |
| return; | |
| } | |
| var scriptName = scriptNode.id || scriptNode.name || "ADD_A_SCRIPT_ID_PLEASE"; | |
| if ("onactivate" in scriptNode) { | |
| if (scriptNode.addEventListener) { | |
| scriptNode.addEventListener("activate", function() { _write("<div><strong>[added] " + scriptName + " activated" + appendScriptReadyState(scriptNode) + "</div>"); }, false); | |
| scriptNode.addEventListener("deactivate", function() { _write("<div><strong>[added] " + scriptName + " deactivated" + appendScriptReadyState(scriptNode) + "</div>"); }, false); | |
| } | |
| else if (scriptNode.attachEvent) { | |
| scriptNode.attachEvent("onactivate", function() { _write("<div><strong>[attached] " + scriptName + " activated" + appendScriptReadyState(scriptNode) + "</div>"); }); | |
| scriptNode.attachEvent("ondeactivate", function() { _write("<div><strong>[attached] " + scriptName + " deactivated" + appendScriptReadyState(scriptNode) + "</div>"); }); | |
| } | |
| else { | |
| scriptNode.onactivate = function() { _write("<div><strong>[on] " + scriptName + " activated" + appendScriptReadyState(scriptNode) + "</div>"); }; | |
| scriptNode.ondeactivate = function() { _write("<div><strong>[on] " + scriptName + " deactivated" + appendScriptReadyState(scriptNode) + "</div>"); }; | |
| } | |
| } | |
| else if (scriptNode.addEventListener) { | |
| scriptNode.addEventListener("DOMActivate", function() { _write("<div><strong>[added] " + scriptName + " DOMActivated" + appendScriptReadyState(scriptNode) + "</div>"); }, false); | |
| scriptNode.addEventListener("DOMDeactivate", function() { _write("<div><strong>[added] " + scriptName + " DOMDeactivated" + appendScriptReadyState(scriptNode) + "</div>"); }, false); | |
| } | |
| if (scriptNode.addEventListener) { | |
| scriptNode.addEventListener("readystatechange", function() { _write("<div><strong>[added] " + scriptName + " readystatechanged" + appendScriptReadyState(scriptNode) + "</div>"); }, false); | |
| scriptNode.addEventListener("load", function() { _log(scriptName + " script, load complete"); _write("<div><strong>[added] " + scriptName + " loaded" + appendScriptReadyState(scriptNode) + "</div>"); }, false); | |
| scriptNode.addEventListener("error", function() { _write("<div><strong>[added] " + scriptName + " erred" + appendScriptReadyState(scriptNode) + "</div>"); }, false); | |
| } | |
| else if (scriptNode.attachEvent) { | |
| scriptNode.attachEvent("onreadystatechange", function() { _write("<div><strong>[attached] " + scriptName + " readystatechanged" + appendScriptReadyState(scriptNode) + "</div>"); }); | |
| scriptNode.attachEvent("onload", function() { _log(scriptName + " script, load complete"); _write("<div><strong>[attached] " + scriptName + " loaded" + appendScriptReadyState(scriptNode) + "</div>"); }); | |
| scriptNode.attachEvent("onerror", function() { _write("<div><strong>[attached] " + scriptName + " erred" + appendScriptReadyState(scriptNode) + "</div>"); }); | |
| } | |
| else { | |
| scriptNode.onreadystatechange = function() { _write("<div><strong>[on] " + scriptName + " readystatechanged" + appendScriptReadyState(scriptNode) + "</div>"); }; | |
| scriptNode.onload = function() { _log(scriptName + " script, load complete"); _write("<div><strong>[on] " + scriptName + " loaded" + appendScriptReadyState(scriptNode) + "</div>"); }; | |
| scriptNode.onerror = function() { _write("<div><strong>[on] " + scriptName + " erred" + appendScriptReadyState(scriptNode) + "</div>"); }; | |
| } | |
| return scriptNode; | |
| } | |
| var addedIdList = []; | |
| function mutationObservation(mutationRecordsList, mutationObserver) { | |
| mutationRecordsList.forEach(function(mutationRecord) { | |
| if (mutationRecord.type === "childList") { | |
| if (mutationRecord.addedNodes) { | |
| for (var i = 0, len = mutationRecord.addedNodes.length; i < len; i++) { | |
| if (mutationRecord.addedNodes[i].nodeName === "SCRIPT" && addedIdList.indexOf(mutationRecord.addedNodes[i].id) === -1) { | |
| _log("Added script! ID: " + mutationRecord.addedNodes[i].id); | |
| addScriptEventHandlers(mutationRecord.addedNodes[i]); | |
| addedIdList.push(mutationRecord.addedNodes[i].id); | |
| } | |
| } | |
| } | |
| else if (mutationRecord.removedNodes) { | |
| for (var i = 0, len = mutationRecord.removedNodes.length; i < len; i++) { | |
| if (mutationRecord.removedNodes[i].nodeName === "SCRIPT") { | |
| _log("Removed script! ID: " + mutationRecord.removedNodes[i].id); | |
| } | |
| } | |
| } | |
| } | |
| }); | |
| } | |
| var observer = new MutationObserver(mutationObservation); | |
| observer.observe(document, { | |
| attributes: false, | |
| characterData: false, | |
| childList: true, | |
| subtree: true | |
| }); | |
| _write("<div><strong>UserAgent:</strong> " + navigator.userAgent + "</div>"); | |
| var scripts = document.getElementsByTagName("script"); | |
| var current = scripts[0]; | |
| var hasRSSupport = "readyState" in current; | |
| _write("<div><strong>script.readyState supported?</strong> " + hasRSSupport + "</div>"); | |
| var hasCSSupport = "currentScript" in document; | |
| _write("<div><strong>Native currentScript supported?</strong> " + hasCSSupport + "</div>"); | |
| showState('loadFirst'); | |
| _log("loadFirst script, evaluating last line"); | |
| </script> | |
| <script id="inlineScript"> | |
| _log("inlineScript script, evaluating first line"); | |
| showState('inlineScript'); | |
| var head = document.head || document.getElementsByTagName("head")[0]; | |
| var newFirstScript = document.createElement("script"); | |
| newFirstScript.id = "dynamicFirstScript"; | |
| newFirstScript.text = '_log("dynamicFirstScript, evaluating first line"); showState("dynamicFirstScript"); _log("dynamicFirstScript, evaluating last line");'; | |
| newFirstScript.async = false; | |
| //addScriptEventHandlers(newFirstScript); | |
| head.insertBefore(newFirstScript, head.firstChild); | |
| _log("inlineScript script, evaluating last line"); | |
| </script> | |
| <script id="loadLast"> | |
| _log("loadLast script, evaluating first line"); | |
| showState('loadLast'); | |
| var newLastScript = document.createElement("script"); | |
| newLastScript.id = "dynamicLastScript"; | |
| newLastScript.text = '_log("dynamicLastScript, evaluating first line"); showState("dynamicLastScript"); _log("dynamicLastScript, evaluating last line");'; | |
| newLastScript.async = false; | |
| //addScriptEventHandlers(newLastScript); | |
| head = document.head || document.getElementsByTagName("head")[0]; | |
| head.appendChild(newLastScript); | |
| window.onload = function() { | |
| showState("pageLoaded"); | |
| setTimeout(function() { | |
| var lateScript = document.createElement("script"); | |
| lateScript.id = "lateScript"; | |
| lateScript.text = '_log("lateScript, evaluating first line"); showState("lateScript"); _log("lateScript, evaluating last line");'; | |
| lateScript.async = false; | |
| //addScriptEventHandlers(lateScript); | |
| var body = document.body || document.getElementsByTagName("body")[0]; | |
| body.appendChild(lateScript); | |
| }, 500); | |
| }; | |
| _log("loadLast script, evaluating last line"); | |
| </script> | |
| </head> | |
| <body> | |
| </body> | |
| </html> |
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