Content Scripts を使う。
ボタン押下とかショートカットキーとかそういうイベントで操作したいなら、
Background から content script のイベントハンドラを呼ぶことになる。
以下、 選択したテキストを<samp>要素でラップする例。
content.js
chrome.runtime.onMessage.addListener(function (request, sender, sendResponse) {
if (request.text == "code-block") {
const selection = window.getSelection().toString().replace(/\n/g, "<br/>");
const insertContent = `<samp>${selection}</samp>`;
document.execCommand("insertHTML", false, insertContent);
sendResponse({ "text": insertContent });
}
});
background.js
chrome.commands.onCommand.addListener(function (command) {
if (command === 'code-block') {
chrome.tabs.query({ active: true, currentWindow: true }, function (tabs) {
chrome.tabs.sendMessage(tabs[0].id, { text: "code-block" }, function (response) {
console.log(response);
});
});
}
});
manifest.json
{
"name": "Encode",
"version": "0.0.2",
"description": "Make a string to a code block.",
"manifest_version": 2,
"permissions": [
"activeTab"
],
"background": {
"scripts": [
"background.js"
],
"persistent": false
},
"content_scripts": [
{
"matches": [
"http://*/*",
"https://*/*"
],
"js": [
"content.js"
]
}
],
"commands": {
"code-block": {
"suggested_key": {
"default": "Ctrl+Shift+Y",
"mac": "Command+Shift+Y"
},
"description": "Make selected text to a code block."
}
}
}