I need to run some jQuery code from Content Script but some website doesn't include jQuery, is there any way to inject it? I tried this but it seem doesn't work at all

var script = document.createElement('script');
script.src = 'https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js';
document.getElementsByTagName('head')[0].appendChild(script);

CodePudding user response：

yes.

If you want to access jquery before body then instead of "document_end" use "document_start" in manifest.json file.

Answer 1.

include it before your content script in manifest.json.

1. download jquery version that you want to use.
2. specify it in manifest.json

manifest.json

{
  "manifest_version": 3,
  "background": {
    "service_worker": "background.js"
  },
  "content_scripts": [
    {
      "matches": ["<tab_url_pattern>"],
      "run_at": "document_end", 
      "js": ["jquery3.5.1.min.js", "contentScript.js"],
      "all_frames": false
    },
  ]
}

Answer 2.

expose jquery file using "Web_accessible_resource" and inject it in required tab using document.body.appendChild()

{
  "manifest_version":3,
  "permissions": ["tabs"],
  "content_scripts":[{
      "matches": ["<url_pattern_1>"],
      "run_at": "document_end",
      "js": ["contentScript.js"],
      "all_frames": false
    }],
    "web_accessible_resources": [
    {
      "resources": ["jquery-1.11.3.min.js", "otherJquery.js"],
      "matches": ["<url_pattern_1>"]
    }
  ]
}

in contentScript.js

const contentScriptLinks = ['jquery-1.11.3.min.js', 'otherJquery.js'];

contentScriptLinks.forEach(src => {
  let el = document.createElement('script');
  el.src = chrome.runtime.getURL(src);
  document.body.appendChild(el);
});