My extension is intended to inject some HTML elements using local JavaScript libraries such PrimeUI, jQueryUI and its correspondent CSS stylesheets.
The best way I have found to do so, is to inject the HTML as follows:
// test.js
$.get(chrome.extension.getURL('/overlay.html'), function(data) {
$($.parseHTML(data)).appendTo('body');
}
// manifest.json
{
"name": "Test",
"version": "1.0",
"manifest_version": 2,
"options_page": "",
"description": "Test",
"browser_action": {
"default_title": "Test",
"default_popup": ""
},
"content_scripts": [
{
"matches": [
"<all_urls>"
],
"js": [
"js/jquery-3.1.1.min.js",
"js/test.js"
]
}
],
"permissions": [
"tabs"
],
"web_accessible_resources": [
"overlay.html",
"css/font-awesome.min.css",
"css/jquery-ui.min.css",
"css/primeui-all.min.css",
"js/jquery-3.1.1.min.js",
"js/jquery-ui.min.js",
"js/primeelements.min.js",
"js/primeui-all.min.js",
"js/main.js"
]
}
I have the required JavaScript libraries inside "js" folder in the root directory, for security reasons I do not retrieve them from a CDN.
My HTML contains CSS and JS on <head> section, but the styles nor the scripts applies in any way.
<html>
<head>
<link rel="stylesheet" href="css/font-awesome.min.css"/>
<link rel="stylesheet" href="css/jquery-ui.min.css"/>
<link rel="stylesheet" href="css/primeui-all.min.css"/>
<script type="text/javascript" src="js/jquery-3.1.1.min.js"></script>
<script type="text/javascript" src="js/jquery-ui.min.js"></script>
<script type="text/javascript" src="js/primeui-all.min.js"></script>
<script type="text/javascript" src="js/x-tag-core.min.js"></script>
<script type="text/javascript" src="js/primeelements.min.js"></script>
</head>
<body>
<button id="btn-show" type="button">Show</button>
<div id="dlg" title="Godfather I">
<p>The story begins as Don Vito Corleone, ...</p>
</div>
</body>
</html>
// main.js
$(function() {
$('#dlg').puidialog({
showEffect: 'fade',
hideEffect: 'fade',
minimizable: true,
maximizable: true,
responsive: true,
minWidth: 200,
modal: true,
buttons: [{
text: 'Yes',
icon: 'fa-check',
click: function() {
$('#dlg').puidialog('hide');
}
},
{
text: 'No',
icon: 'fa-close',
click: function() {
$('#dlg').puidialog('hide');
}
}
]
});
$('#btn-show').puibutton({
icon: 'fa-external-link-square',
click: function() {
$('#dlg').puidialog('show');
}
});
}
The button is successfully displayed but with no events are attached nor styles.
i.e: if I inject this code on StackOverflow my button get the styles from SO and not mine.
I want to avoid as much as possible JavaScript for creating elements, or injecting tags programmatically, to separate the View from the Controller.
How can I manage to use my styles and scripts with my injected HTML as we do ordinarily? I have tried adding them to web_accessible_resources, and other manifest fields unsuccessfully.
Makyen explained:
It is not possible to parse HTML with <head> elements hardcoded such <script> and <link>. Instead it should be injected in other way.
The ways I have chosen to inject the files are:
// Test.js
/** CSS Injection */
var link = document.createElement("link");
link.href = chrome.extension.getURL("css/jquery-ui.min.css");
link.type = "text/css";
link.rel = "stylesheet";
document.getElementsByTagName("head")[0].appendChild(link);
// Test.js
/** JavaScript Injection */
var s = document.createElement('script');
s.src = chrome.extension.getURL('js/jquery-3.1.1.min.js');
// "When an inline script is inserted in the document, it's immediately executed
// and the <script> tag can safely be removed". – Rob W.
s.onload = s.remove;
(document.head || document.documentElement).appendChild(s);
Trying to insert large amounts of code/libraries as into the page context using tags has a significant chance of interfering with the current contents/JavaScript of the page. Is there a reason that you are inserting scripts into the page context? Normally, you would have these inserted scripts (and CSS) as content scripts (manifest.json content_scripts, or chrome.tabs.executeScript()/chrome.tabs.insertCSS(). not in the page context. – Makyen
With the above code I have successfully injected the files, but the styles and functions are applied only sometimes, I will edit when I fix this.