Created
January 22, 2020 12:13
injectInHead example
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| <!doctype html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script type="text/javascript"> | |
| function injectInHead({ | |
| targetId = "corllete", | |
| src, | |
| type, | |
| loadTimeout = 0, | |
| callbackTimeout = 0, | |
| }, callback) { | |
| var url = src.replace(/^https?:\/\//, ""); | |
| var hash = "owned-by-corllete"; | |
| var targetEl = document.getElementById(targetId); | |
| if (targetEl) { | |
| targetEl.innerHTML = ""; | |
| targetEl.style.cssText = targetEl.style.cssText + | |
| `display: flex;align-items: center;justify-content: center;width: 200px;height: 200px;background: ${targetEl.style.backgroundColor} url(https://thumbs.gfycat.com/UnderstatedFrayedAlabamamapturtle-size_restricted.gif) no-repeat 50% 50% / 100%;` | |
| } | |
| var alreadyExist = document.getElementById(hash); | |
| if (alreadyExist) { | |
| if (callback) { | |
| callback(); | |
| } | |
| return null; | |
| } | |
| var f; | |
| if (type === "js") { | |
| f = document.createElement("script"); | |
| f.setAttribute("type", "text/javascript"); | |
| f.setAttribute("src", `//${url}`); | |
| f.setAttribute("id", hash); | |
| f.setAttribute("defer", true); | |
| } | |
| if (type === "css") { | |
| f = document.createElement("link"); | |
| f.setAttribute("id", hash); | |
| f.setAttribute("rel", "stylesheet"); | |
| f.setAttribute("type", "text/css"); | |
| f.setAttribute("href", `//${url}`); | |
| f.setAttribute("defer", true); | |
| } | |
| if (typeof f !== "undefined") { | |
| var loaded; | |
| setTimeout(() => { | |
| document.getElementsByTagName("head")[0].appendChild(f); | |
| }, loadTimeout); | |
| if (callback) { | |
| f.onload = () => { | |
| if (!loaded) { | |
| setTimeout(() => { | |
| callback(); | |
| }, callbackTimeout); | |
| return null; | |
| } | |
| loaded = true; | |
| }; | |
| } | |
| } | |
| }; | |
| </script> | |
| </head> | |
| <body> | |
| <div id="corllete" style="background: red">placeholder</div> | |
| <script type="text/javascript"> | |
| setInterval(() => { | |
| injectInHead({ | |
| src: "//cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js", | |
| type: "js", | |
| loadTimeout: 3000, | |
| targetId: "corllete", | |
| }, function () { | |
| var today = moment().format('YYYY-MM-DD'); | |
| var html = `<p>today is ${today}</p>`; | |
| var el = document.getElementById("corllete"); | |
| el.style.background = 'none'; | |
| el.innerHTML = html; | |
| }); | |
| }, 3000); | |
| </script> | |
| </body> | |
| </html> |
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