![](/img/trans.png)
[英]How to bring tab to front using Firefox WebExtensions API
[英]How to restore the state of checkboxes using WebExtensions storage API
我正在構建一個firefox Web擴展,我想為其用戶提供一些可以檢查/取消檢查的選項。 復選框的狀態通過WebExtensions存儲API在本地保存,但是我不太確定如何恢復每個選項的保存狀態。
這是options.html文件:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> </head> <body> <form method="post"> <fieldset> <legend>My favorite veggies</legend> <input type="checkbox" name="eggplant" id="eggplant" />Eggplant<br /> <input type="checkbox" name="zucchini" id="zucchini" />Zucchini<br /> <input type="checkbox" name="tomatoe" id="tomatoe" />Tomatoe<br /> <input type="submit" value="Submit" /> </fieldset> </form> <script src="options.js"></script> </body> </html>
保存/恢復復選框狀態的options.js文件如下:
function onError(error) { console.log(`Error: ${error}`); } function saveOptions(e) { // List of search engines to be used let eggplant = { name: "Eggplant", imageUrl: "https://www.organicfacts.net/wp-content/uploads/2013/06/Eggplant-1020x765.jpg", show: form.eggplant.checked }; let zucchini = { name: "Zucchini", imageUrl: "https://www.organicfacts.net/wp-content/uploads/zucchini.jpg", show: form.zucchini.checked }; let tomatoe = { name: "Tomatoe", imageUrl: "https://www.organicfacts.net/wp-content/uploads/2013/05/Organictomato1-1020x765.jpg", show: form.tomatoe.checked }; let setting = browser.storage.sync.set({ eggplant, zucchini, tomatoe }); setting.then(null,onError); e.preventDefault(); } function restoreOptions() { var gettingItem = browser.storage.sync.get({ 'show' }); gettingItem.then((res) => { document.getElementById("eggplant").checked = eggplant.show; document.getElementById("zucchini").checked = zucchini.show; document.getElementById("tomatoe").checked = tomatoe.show; }); } document.addEventListener('DOMContentLoaded', restoreOptions); document.querySelector("form").addEventListener("submit", saveOptions);
set
操作后的存儲狀態如下:
{
eggplant: {
name: "Eggplant",
imageUrl: "https://www.organicfacts.net/wp-content/uploads/2013/06/Eggplant-1020x765.jpg",
show: true
},
zucchini: { /* ... */ },
tomatoe: { /* ... */ }
}
但是,在restoreOptions
,您使用鍵"show"
-或更具體地說,使用語法錯誤的對象常量{"show"}
查詢存儲。
即使您將其修復為"show"
,也不是這樣的頂級關鍵字(並且這是唯一允許您查詢的類型),所以結果顯示為空。
null
。 以下是使用默認值組織代碼的方法:
const defaults = {
eggplant: {
name: "Eggplant",
imageUrl: "(redacted for brevity)",
show: false
},
zucchini: {
name: "Zucchini",
imageUrl: "(redacted for brevity)",
show: false
},
tomatoe: {
name: "Tomatoe",
imageUrl: "(redacted for brevity)",
show: false
}
};
function saveOptions() {
let settings = {}
for (let setting in defaults) {
settings[setting] = {
...defaults[setting], // spread the default values
show: form[setting].checked // override show with real data
}
}
browser.storage.sync.set(settings).then(null, onError);
}
function restoreOptions() {
browser.storage.sync.get(defaults).then(
(data) => {
document.getElementById("eggplant").checked = data.eggplant.show;
document.getElementById("zucchini").checked = data.zucchini.show;
document.getElementById("tomatoe").checked = data.tomatoe.show;
}
);
}
注意:不要使用submit
和preventDefault
,只需使用type="button"
輸入並click
。
較小的修改:對象傳播( ...defaults[setting]
)仍處於實驗階段(盡管最近的Chrome / FF支持),但與ES6兼容的代碼將是
for (let setting in defaults) {
// shallow copy default settings
settings[setting] = Object.assign({}, defaults[setting]);
// override show property
settings[setting].show = form[setting].checked;
}
不太簡潔,更兼容。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.