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增加了2个与页面显示相关的API

HTML5中与页面突显相关的API

2015/05/15 · HTML5 · HTML5

初稿出处: 涂根华的博客   

在HTML5中,扩大了2个与页面呈现相关的API,分别是Page Visibility API与Fullscreen API; 效用分别如下:

Page Visibility API  是指当页面变为最小化状态或许客户将浏览器标签切换成别的标签时会触发。

Fullscreen API 是将页面全部或页面中有些局地区域设为全屏。

Page Visibility API的利用场地如下:

  1. 贰个应用程序中具备多幅图片的幻灯片式的连接播发效果,当页面变为不可知状态(最小化状态大概将客户浏览器标签切换成其余标签时),图片停播,当页面变为可知状态时,图片继续播放。
  2. 在二个实时展现服务器端信息的应用程序中,当页面处于不可知状态(最小化状态可能将客商浏览器标签切换到别的标签时),结束定时向服务器端恳求数据的管理,当页面变为可知状态,继续推行定时向劳动器端央求数据的处理。
  3. 在一个有所播放录制功用的应用程序中,当页面处于不可知状态(最小化状态也许将顾客浏览器标签切换成别的标签时),暂停止播放放录制,当页面变为可知状态时,继续播放录像。

浏览器协助程度:Firefox10 ,chrome14 ,IE10 ;

实现Page Visibility API

在运用Page Visibility API时,我们率先供给看清当前顾客所选择的浏览器以及该浏览器是还是不是协理。代码如下决断:

JavaScript

if(typeof document.hidden !== 'undefined') { hidden = 'hidden'; visibilityChange = 'visibilitychange'; }else if(typeof document.mozHidden !== 'undefined') { hidden = 'mozHidden'; visibilityChange = 'mozvisibilitychange'; }else if(typeof document.msHidden !== 'undefined') { hidden = 'msHidden'; visibilityChange = 'msvisibilitychange'; }else if(typeof document.webkitHidden !== 'undefined') { hidden = 'webkitHidden'; visibilityChange = 'webkitvisibilitychange'; }

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if(typeof document.hidden !== 'undefined') {
    hidden = 'hidden';
    visibilityChange = 'visibilitychange';
}else if(typeof document.mozHidden !== 'undefined') {
    hidden = 'mozHidden';
    visibilityChange = 'mozvisibilitychange';
}else if(typeof document.msHidden !== 'undefined') {
    hidden = 'msHidden';
    visibilityChange = 'msvisibilitychange';
}else if(typeof document.webkitHidden !== 'undefined') {        
    hidden = 'webkitHidden';
    visibilityChange = 'webkitvisibilitychange';
}

如上,在Page Visibility  API中,能够因而document对象的hidden属性值来剖断页面是还是不是处于可知状态,当页面处于可知状态时属性值为false,当页面处于不可知状态时属性值为true。

在Page Visibility中,能够透过document对象的visibilityState属性值来判断页面包车型大巴可知状态。该属性值为二个字符串,其意思如下所示:

    visible: 页面内容部分可见,当前页面位于顾客正在查阅的浏览器标签窗口中,且浏览器窗口未被最小化。

    hidden: 页面内容对客商不可知。当前页面不在客户正在查阅的浏览器标签窗口中,或浏览器窗口已被最小化。

    prerender: 页面内容已被预渲染,不过对顾客不可知。

当今大家来看一个demo,页面中有一个video成分与八个”播放”按钮,客户单击”播放”按键时 按键文字变为 ’暂停”,同期开班播报video成分的摄像,当页面变为最小化状态或客户浏览器标签切换来任何标签时候,摄像被中断播放,当页面复苏平时状态或顾客将浏览器标签切回页面所在标签时,录制持续播放。

HTML代码如下:

JavaScript

<video id="videoElement" controls width=640 height=360 autoplay> <source src="Wildlife/Wildlife.ogv" type='video/ogg; codecs="theora, vorbis"'/> <source src="Wildlife/Wildlife.webm" type='video/webm' > <source src="Wildlife/Wildlife.mp4" type='video/mp4'> </video> <button id="btnPlay" onclick="PlayOrPause()">播放</button> <div style="height:1500px;"></div>

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<video id="videoElement" controls width=640 height=360 autoplay>
    <source src="Wildlife/Wildlife.ogv" type='video/ogg; codecs="theora, vorbis"'/>
    <source src="Wildlife/Wildlife.webm" type='video/webm' >
    <source src="Wildlife/Wildlife.mp4" type='video/mp4'>
</video>
<button id="btnPlay" onclick="PlayOrPause()">播放</button>
<div style="height:1500px;"></div>

JS代码如下:

JavaScript

var hidden, visibilityChange, videoElement; if(typeof document.hidden !== 'undefined') { hidden = 'hidden'; visibilityChange = 'visibilitychange'; }else if(typeof document.mozHidden !== 'undefined') { hidden = 'mozHidden'; visibilityChange = 'mozvisibilitychange'; }else if(typeof document.msHidden !== 'undefined') { hidden = 'msHidden'; visibilityChange = 'msvisibilitychange'; }else if(typeof document.webkitHidden !== 'undefined') { hidden = 'webkitHidden'; visibilityChange = 'webkitvisibilitychange'; } document.add伊芙ntListener(visibilityChange,handle,false); videoElement = document.getElementById("videoElement"); videoElement.addEventListener('ended',videoEnded,false); videoElement.add伊夫ntListener('play',videoPlay,false); videoElement.addEventListener('pause',videoPause,false); // 倘诺页面变为不可知状态 则暂停录制播放 // 若是页面变为可知状态,则再而三录像播放 function handle() { // 通过visibilityState属性值判别页面包车型大巴可知状态 console.log(document.visibilityState); if(document[hidden]) { videoElement.pause(); }else { videoElement.play(); } } // 播放录像function play() { videoElement.play(); } // 暂停止播放放 function pause() { videoElement.pause(); } function PlayOrPause() { if(videoElement.paused) { videoElement.play(); }else { videoElement.pause(); } } function videoEnded(e) { videoElement.currentTime = 0; this.pause(); } function videoPlay(e) { var btnPlay = document.getElementById("btnPlay"); btnPlay.innerHTML = "暂停"; } function videoPause(e) { var btnPlay = document.getElementById("btnPlay"); btnPlay.innerHTML = "播放"; }

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var hidden,
visibilityChange,
videoElement;
if(typeof document.hidden !== 'undefined') {
    hidden = 'hidden';
    visibilityChange = 'visibilitychange';
}else if(typeof document.mozHidden !== 'undefined') {
    hidden = 'mozHidden';
    visibilityChange = 'mozvisibilitychange';
}else if(typeof document.msHidden !== 'undefined') {
    hidden = 'msHidden';
    visibilityChange = 'msvisibilitychange';
}else if(typeof document.webkitHidden !== 'undefined') {
    hidden = 'webkitHidden';
    visibilityChange = 'webkitvisibilitychange';
}
document.addEventListener(visibilityChange,handle,false);
videoElement = document.getElementById("videoElement");
videoElement.addEventListener('ended',videoEnded,false);
videoElement.addEventListener('play',videoPlay,false);
videoElement.addEventListener('pause',videoPause,false);
// 如果页面变为不可见状态 则暂停视频播放
// 如果页面变为可见状态,则继续视频播放
function handle() {
    // 通过visibilityState属性值判断页面的可见状态
    console.log(document.visibilityState);
    if(document[hidden]) {
        videoElement.pause();    
    }else {
        videoElement.play();
    }
}
// 播放视频
function play() {
    videoElement.play();
}
// 暂停播放
function pause() {
    videoElement.pause();
}
function PlayOrPause() {
    if(videoElement.paused) {
        videoElement.play();
    }else {
        videoElement.pause();
    }
}
function videoEnded(e) {
    videoElement.currentTime = 0;
    this.pause();
}
function videoPlay(e) {
    var btnPlay = document.getElementById("btnPlay");
    btnPlay.innerHTML = "暂停";
}
function videoPause(e) {
    var btnPlay = document.getElementById("btnPlay");
    btnPlay.innerHTML = "播放";
}

实现Fullscreen API

在HTML5中,新添了一个Fullscreen API,其效果是将页面全体或页面中某些局地区域设为全屏展现状态。

浏览器扶助程度:Firefox10 ,chrome16 ,Safari5.1

在Fullscreen API中,能够透过DOM对象的根节点指标或有个别成分的requestFullscreen属性值和进行相对应的主意来判断浏览器是或不是辅助Fullscreen API。代码如下:

JavaScript

var docElm = document.documentElement; if(docElm.requestFullscreen) { docElm.requestFullscreen(); }else if(docElm.mozRequestFullScreen) { docElm.mozRequestFullScreen(); }else if(docElm.webkitRequestFullScreen) { docElm.webkitRequestFullScreen(); }

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var docElm = document.documentElement;
if(docElm.requestFullscreen) {
        docElm.requestFullscreen();
}else if(docElm.mozRequestFullScreen) {
        docElm.mozRequestFullScreen();
}else if(docElm.webkitRequestFullScreen) {
        docElm.webkitRequestFullScreen();
}

在Fullscreen API中,也能够经过DOM对象或某些成分的exitFullscreen与CanvelFullScreen属性和艺术将日前页面或有个别成分设定为非全屏呈现状态。

一般来讲代码:

JavaScript

if(document.exitFullscreen) { document.exitFullscreen(); }else if(document.mozCancelFullScreen) { document.mozCancelFullScreen(); }else if(document.webkitCancelFullScreen) { document.webkitCancelFullScreen(); }

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if(document.exitFullscreen) {
    document.exitFullscreen();
}else if(document.mozCancelFullScreen) {
    document.mozCancelFullScreen();
}else if(document.webkitCancelFullScreen) {
    document.webkitCancelFullScreen();
}

在Fullscreen API中,能够透过监听DOM对象或某些成分的fullscreenchange事件(当页面或因素从非全屏突显状态成为全屏展现状态,或从全屏彰显状态造成非全屏显示状态时触发)。代码如下:

JavaScript

document.addEventListener('fullscreenchange',function(){},false); document.addEventListener('mozfullscreenchange',function(){},false); document.addEventListener('webkitfullscreenchange',function(){},false);

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document.addEventListener('fullscreenchange',function(){},false);
document.addEventListener('mozfullscreenchange',function(){},false);
document.addEventListener('webkitfullscreenchange',function(){},false);

在css样式代码中,大家能够行使伪类选拔器来单独内定处于全屏突显状态的页面或因素样式:

JavaScript

html:-moz-full-screen { background:red; } html:-webkit-full-screen { background:red; } html:fullscreen { background:red; }

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html:-moz-full-screen {
    background:red;
}
html:-webkit-full-screen {
    background:red;
}
html:fullscreen {
    background:red;
}

谈到底大家来看八个demo,在页面中有一个按键,点击后,页面会形成全屏状态,再点击后,页面会脱离全屏;

HTML代码如下:

JavaScript

<input type="button" id="btnFullScreen" value="页面全屏展现" onclick="toggleFullScreen();"/> <div style="width:百分之百;" id="fullscreentState">非全屏展现</div>

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<input type="button" id="btnFullScreen" value="页面全屏显示" onclick="toggleFullScreen();"/>
<div style="width:100%;" id="fullscreentState">非全屏显示</div>

Javascript如下:

JavaScript

var docElm = document.documentElement; var fullscreentState = document.getElementById("fullscreentState"); var btnFullScreen = document.getElementById("btnFullScreen"); fullscreentState.style.height = docElm.clientHeight 'px'; document.add伊芙ntListener('fullscreenchange',function(){ fullscreentState.innerHTML = (document.fullscreen) ? "全屏显示" : "非全屏呈现"; },false); document.add伊夫ntListener('mozfullscreenchange',function(){ fullscreentState.innerHTML = (document.mozFullscreen) ? "全屏展现" : "非全屏呈现"; },false); document.add伊夫ntListener('webkitfullscreenchange',function(){ fullscreentState.innerHTML = (document.webkitFullscreen) ? "全屏呈现" : "非全屏显示"; },false); function toggleFullScreen() { if(btnFullScreen.value == '页面全屏突显') { btnFullScreen.value = '页面非全屏展现'; if(docElm.requestFullscreen) { docElm.requestFullscreen(); }else if(docElm.mozRequestFullScreen) { docElm.mozRequestFullScreen(); }else if(docElm.webkitRequestFullScreen) { docElm.webkitRequestFullScreen(); } }else { if(document.exitFullscreen) { document.exitFullscreen(); }else if(document.mozCancelFullScreen) { document.mozCancelFullScreen(); }else if(document.webkitCancelFullScreen) { document.webkitCancelFullScreen(); } btnFullScreen.value = "页面全屏展现"; } }

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var docElm = document.documentElement;
var fullscreentState = document.getElementById("fullscreentState");
var btnFullScreen = document.getElementById("btnFullScreen");
fullscreentState.style.height = docElm.clientHeight 'px';
document.addEventListener('fullscreenchange',function(){
    fullscreentState.innerHTML = (document.fullscreen) ? "全屏显示" : "非全屏显示";
},false);
document.addEventListener('mozfullscreenchange',function(){
    fullscreentState.innerHTML = (document.mozFullscreen) ? "全屏显示" : "非全屏显示";
},false);
document.addEventListener('webkitfullscreenchange',function(){
    fullscreentState.innerHTML = (document.webkitFullscreen) ? "全屏显示" : "非全屏显示";
},false);
function toggleFullScreen() {
    if(btnFullScreen.value == '页面全屏显示') {
        btnFullScreen.value = '页面非全屏显示';
        if(docElm.requestFullscreen) {
            docElm.requestFullscreen();
        }else if(docElm.mozRequestFullScreen) {
            docElm.mozRequestFullScreen();
        }else if(docElm.webkitRequestFullScreen) {
            docElm.webkitRequestFullScreen();
        }
    }else {
        if(document.exitFullscreen) {
            document.exitFullscreen();
        }else if(document.mozCancelFullScreen) {
            document.mozCancelFullScreen();
        }else if(document.webkitCancelFullScreen) {
            document.webkitCancelFullScreen();
        }
        btnFullScreen.value = "页面全屏显示";
    }
}

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