网站首页  汉语字词  英语词汇  考试资料  写作素材  旧版资料

请输入您要查询的考试资料：

　

标题 html5桌面通知(Web Notifications)实例解析
内容
    这篇文章主要为大家介绍了html5桌面通知(Web Notifications)实例，对于进行html5网站建设非常有用！需要的朋友可以参考下。
    html5桌面通知(Web Notifications)对于需要实现在新消息入线时，有桌面通知效果的情况下非常有用，在此简单介绍一下这个html5的新属性。
    这里有个不错的demo：html5 web notification demo
    从上面这个demo中 我们就可以获取所需要的基本核心代码，如下：
    代码如下:
    <script>
    var Notification = window.Notification || window.mozNotification || window.webkitNotification;
    Notification.requestPermission(function (permission) {
    // console.log(permission);
    });
    function show() {
    var instance = new Notification(
    "test title", {
    body: " test message"
    }
    );
    instance.onclick = function () {
    // Something to do
    };
    instance.onerror = function () {
    // Something to do
    };
    instance.onshow = function () {
    // Something to do
    };
    instance.onclose = function () {
    // Something to do
    };
    return false;
    }
    </script>
    其中：Notification.requestPermission 这句代码的功能就是向用户请求权限允许。
    通过以上的例子，基本思路我们已经有了，首先加载文档时，就向用户请求权限，获取权限后以后都so easy了。
    代码如下:
    window.addEventListener('load', function () {
    // At first, let's check if we have permission for notification
    if (Notification && Notification.permission !== "granted") {
    Notification.requestPermission(function (status) {
    if (Notification.permission !== status) {
    Notification.permission = status;
    }
    });
    }
    });
    火狐下 验证是通过的，但是在chrome下总是出不来，后来发现这样一段话
    代码如下:
    Not a Bug, Feature.
    Desktop Notifications can only be triggered via a user action. Typing into the
    JavaScript console has the same effect as raw javascript code embedded into the web
    page (no user action). Typing the javascript into the location bar, however,
    represents a user-action (the user is intentionally visiting a javascript link to
    enable notifications, probably for sites that tend to use href="javascript：" instead
    of onclick="".
    I'm pretty sure this is a non-issue.
    原来在chrome下是必须要用户手动触发的，否则，chrome浏览器会无视这段的js
    但是在我们网站里肯定不可能加一个按钮或者超链接来显式的让用户授权吧，好吧， 实际上这也不是个事情，我们可以在用户经常点的按钮上顺便处理下这个授权就好，在chrome下是一次授权终身有用。除非你进入设置把他禁了。
    整合一下，代码如下：
    代码如下:
    function showMsgNotification(title, msg){
    var Notification = window.Notification || window.mozNotification || window.webkitNotification;
    if (Notification && Notification.permission === "granted") {
    var instance = new Notification(
    title, {
    body: msg,
    icon: "image_url"
    }
    );
    instance.onclick = function () {
    // Something to do
    };
    instance.onerror = function () {
    // Something to do
    };
    instance.onshow = function () {
    // Something to do
    // console.log(instance.close);
    setTimeout(instance.close, 3000);
    };
    instance.onclose = function () {
    // Something to do
    };
    }else if (Notification && Notification.permission !== "denied") {
    Notification.requestPermission(function (status) {
    if (Notification.permission !== status) {
    Notification.permission = status;
    }
    // If the user said okay
    if (status === "granted") {
    var instance = new Notification(
    title, {
    body: msg,
    icon: "image_url"
    }
    );
    instance.onclick = function () {
    // Something to do
    };
    instance.onerror = function () {
    // Something to do
    };
    instance.onshow = function () {
    // Something to do
    setTimeout(instance.close, 3000);
    };
    instance.onclose = function () {
    // Something to do
    };
    }else {
    return false
    }
    });
    }else{
    return false;
    }
    }
随便看

　

在线学习网考试资料包含高考、自考、专升本考试、人事考试、公务员考试、大学生村官考试、特岗教师招聘考试、事业单位招聘考试、企业人才招聘、银行招聘、教师招聘、农村信用社招聘、各类资格证书考试等各类考试资料。

　

Copyright © 2002-2024 cuapp.net All Rights Reserved
更新时间：2025/5/16 3:14:12