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I am writing a Chrome Extension and I have this page:
<html>
<body>
<button id="changeColor"></button>
<script src="popup.js"></script>
</body>
</html>
With this JS (popup.js):
let changeColor = document.getElementById("changeColor");
chrome.storage.sync.get("color", ({ color }) => {
changeColor.style.backgroundColor = color;
});
changeColor.addEventListener("click", async () => {
let [tab] = await chrome.tabs.query({ active: true, currentWindow: true });
chrome.scripting.executeScript({
target: { tabId: tab.id },
function: setPageBackgroundColor,
});
});
function setPageBackgroundColor() {
chrome.storage.sync.get("color", ({ color }) => {
document.body.style.backgroundColor = color;
});
// Here, it says: Uncaught ReferenceError: getElementByXpath is not defined
console.log(getElementByXpath("xpath").textContent);
}
function getElementByXpath(path) {
return document.evaluate(path, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
}
Why?
454
Solution: put all necessary code and functions inside the function you inject.
In your case getElementByXpath definition should be moved inside setPageBackgroundColor.
The reason is that executeScript injects the function as TEXT:
(function foo() { ... })(),ISOLATED world environment where all content scripts of your extension run by default or the unsafe MAIN world where all page scripts run if you specified it explicitly,The injected function can also use the existing global variables/functions created in the same world by files and functions injected via executeScript/registerContentScript or manifest.json's content_scripts that already ran in this page.
197
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