javascript - How to have a script in the <head> add script at the end of the <body>

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javascript - How to have a script in the <head> add script at the end of the <body>

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

javascript - How to have a script in the <head> add script at the end of the <body>

A client is using Sharetribe which allows you add custom JS via admin, but only in the head. I want my script to load after jQuery, but jQuery is loaded at the end of the body. How can I write vanilla JS that adds my main script to the end once the doc loads?

I tried this:

<script>
    var script   = document.createElement("script");
    script.type  = "text/javascript";
    script.src   = "http://cdn...";
    document.body.appendChild(script);

    var script2 = document.createElement("script");
    script2.type  = "text/javascript";
    script2.text  = "$(SOME.CODE.HERE);"
    document.body.appendChild(script2);
</script>

But it gets executed before the document is finished loading (and in particular, before jQuery is available). The only thing I can think of is to set a timer, but that seems buggy.

Any advice?

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1 Answer

深蓝 · Answer 1 · 2021-10-17T03:08:57+0000

Use DOMContentLoaded event:

The DOMContentLoaded event is fired when the document has been completely loaded and parsed, without waiting for stylesheets, images, and subframes to finish loading (the load event can be used to detect a fully-loaded page).

document.addEventListener("DOMContentLoaded", function (event) {
  console.log("DOM fully loaded and parsed");

  // Your code here
});

DOMContentLoaded is same as ready event of jQuery.

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javascript - How to have a script in the <head> add script at the end of the <body>

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