三天学会HTML5 ——多媒体元素的使用-H5 Tutorial-php.cn

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三天学会HTML5 ——多媒体元素的使用

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May 17, 2016 am 09:06 AM

　　1. HTML5 Media-Video

　　2. HTML5 Media-Audio

　　3. 拖拽操作

　　4. 获取位置信息

　　5. 使用Google 地图获取位置信息

　　多媒体是互联网中的最重要的一部分，无论访问的是哪种类型的网页，视频或音频触手可及，在之前实现这些功能对开发人员来说可能非常痛苦，必须依赖Object 标签，调用第三方软件来加载，如Flash等，如果有些设备不支持Flash，我们对此就束手无策了。但是HTML5的出现让多媒体网页开发变得异常简单，也形成了新的标准。

　　1. 使用Video 元素。

　　在本节中学习如何在HTML5中使用Video 元素

　　1.准备视频资源

　　2. 创建HTML 页面

　　新建HTML ，并命名为“Media.html”,输入以下内容：

<font size="3"><video controls width="500px" id="vid">
<source src="vid.mp4" />
</video></font>

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　　可以观察到的是video 标签中包含“Controls”,添加该标签可以使得播放器工具栏可见。Control bar 和我们平常所见到的一样，非常简单，包含暂停，播放，停止等按钮。

　　注意：

　　要确保video 和html 文件存放到同一目录下。如果想放置在不同的目录下，需要设置src 属性。

　　HTML5 Video 元素只支持MP4，webm,3gpp,m4v mpeg,ogg ，quicktime,x-ms-wmvright格式。

　　输出：

　　2. 使用脚本控制Video 元素

　　1. 创建HTML 页面

　　新建HTML 页面“Media01.html”设置Video 资源 src属性。在本节中不使用Controls 属性来设置，使用JS代码来实现。

<video width="500px" id="vid">
<source src="vid.mp4" />
</video>

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　　2. 添加播放，暂停，和声音调节按钮。

<input type="button" name="name" value="Play" id="BtnPlay" />
<input type="button" name="name" value="Stop" id="btnStop" />
<input type="button" name="name" value="End" id="btnEnd" />
<input type="range" name="name" value="0.1" min="0" max="1" step="0.1" id="slideVolume" />

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　　3. 创建JS 函数来控制Video播放。

function PlayOrPause()
{
var v = document.getElementById('vid');
if (v.paused || v.ended)
{
v.play();
document.getElementById('BtnPlay').value = "Pause";
}
else
{
v.pause();
document.getElementById('BtnPlay').value = "Play";
}
}

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　　设置CurrentTime为6,则表示在第六秒时视频停止播放。

function Stop()
{
var v = document.getElementById('vid');
v.pause();
v.currentTime = 6;
document.getElementById('BtnPlay').value = "Play";
}

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　　如下是设置当视频播放完成之后停止播放：

function End()
{
var v = document.getElementById('vid');
v.pause();
v.currentTime = v.duration;
document.getElementById('BtnPlay').value = "Play";
}

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　　以下代码是将声音调节控制到0-1之间：

function ChangeVolume(element)
{
var v = document.getElementById('vid');
v.volume = element.value;//For mute set it to 0
}

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　　输出：

　　3. Audio 元素

　　HTML5使得在页面中加载音频元素变得非常简单。

　　1. 准备音频资源

　　2. 新建HTML页面，输入以下内容：

<audio id="audctrl" controls>
<source src="aud.mp3" type="audio/mp3" />
</audio>

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　　3. 输出：

　　4. 使用脚本添加音频元素

　　1.新建HTML页面

<audio id="audctrl">
<source src="aud.mp3" type="audio/mp3" />
</audio>

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　　2. 添加播放，暂停及音量键

<innput type="button" name="name" value="Play" id="BtnPlay" />
<input type="button" name="name" value="Stop" id="btnStop" />
<input type="button" name="name" value="End" id="btnEnd" />
<input type="range" name="name" value="0.1" min="0" max="1" step="0.1" id="slideVolume" />

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　　3. 创建JS 函数来控制音频播放。代码如下：

function PlayOrPause()
{
var v = document.getElementById('audctrl');
if (v.paused || v.ended)
{
v.play();
document.getElementById('BtnPlay').value = "Pause";
}
else
{
v.pause();
document.getElementById('BtnPlay').value = "Play";
}
}
同上，设置在第6秒停止播放：
function Stop()
{
var v = document.getElementById('audctrl');
v.pause();
v.currentTime = 6;
document.getElementById('BtnPlay').value = "Play";
}

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　　5. 拖拽操作的实现

　　在之前，实现拖拽操作都是开发人员自定义逻辑来实现，但是HTML5提供了拖拽API ，使得拖拽操作的实现变得如此简单。

　　1. 准备资源(图片资源)

　　2. 设置draggable 属性

<img  src="/static/imghw/default1.png"  data-src="fish.png"  class="lazy"   style="max-width:90%" draggable="true" id="img11" ondragstart="drag(event)" / alt="三天学会HTML5 ——多媒体元素的使用" >

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　　3. 输出

　　4. 实现drag 事件

function drag(ev) {
ev.dataTransfer.setData("text", ev.target.id);
}

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　　5. drog 操作

<div id="div1" class="bowl" ondrop="drop(event)" ondragover="allowDrop(event)">
</div>

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　　输出：

　　ondragover 事件制定被拖拽的数据。

function allowDrop(ev) {
ev.preventDefault();
}

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　　当拖拽的元素被鼠标释放时，自动调用ondrop 事件

function drop(ev) {
ev.preventDefault();
var data = ev.dataTransfer.getData("text");
ev.target.appendChild(document.getElementById(data));
}

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　　输出：

　　6. 复杂的拖拽操作实现

　　新建HTML页面，HTML & Css 代码如下：

<style>
body {
cursor: pointer;
text-align: center;
}
.divdrag {
position: relative;
border: 0px solid rgba(0, 0, 0, .25);
width: 300px;
height: 300px;
padding: 10px 10px10px10px;
float: left;
}
.face {
background-image: url('face.jpg');
background-repeat: no-repeat;
width: 424px;
height: 510px;
border: 1px dotted grey;
padding: 0 0 0 0;
}
.facetr td {
text-align: center;
border: 1px dotted #f7ecec;
}
</style>
<h2 id="Create-the-face">Create the face</h2>
<div class="divdrag">
<img src="/static/imghw/default1.png"  data-src="eye1.png"  class="lazy" alt="eye" draggable="true" id="eye1" ondragstart="drag(event)" />
<img src="/static/imghw/default1.png"  data-src="eye2.png"  class="lazy" alt="eye" draggable="true" id="eye2" ondragstart="drag(event)" />
<img src="/static/imghw/default1.png"  data-src="nose2.png"  class="lazy" alt="nose" draggable="true" id="nose2" ondragstart="drag(event)" />
<img src="/static/imghw/default1.png"  data-src="eye4.png"  class="lazy" alt="eye" draggable="true" id="eye4" ondragstart="drag(event)" />
<img src="/static/imghw/default1.png"  data-src="nose1.png"  class="lazy" alt="nose" draggable="true" id="nose1" ondragstart="drag(event)" />
<img src="/static/imghw/default1.png"  data-src="eye3.png"  class="lazy" alt="eye" draggable="true" id="eye3" ondragstart="drag(event)" />
<img src="/static/imghw/default1.png"  data-src="smile1.png"  class="lazy" alt="smile" draggable="true" id="smile1" ondragstart="drag(event)" />
<img src="/static/imghw/default1.png"  data-src="smile3.png"  class="lazy" alt="smile" draggable="true" id="smile2" ondragstart="drag(event)" />
<img src="/static/imghw/default1.png"  data-src="smile2.png"  class="lazy" alt="smile" draggable="true" id="smile3" ondragstart="drag(event)" />
</div>
<div style="float:left;">
<a href="DragnDrop.html" title="Click here to reset" style="text-decoration:none;">
<img  src="/static/imghw/default1.png"  data-src="direction.png"  class="lazy"    style="max-width:90%"  style="max-width:90%" onclick="" / alt="三天学会HTML5 ——多媒体元素的使用" >
</a>
</div>
<div id="div1" style="width:300px;height:300px;float:left;">
<table class="face">
<tr>
<td colspan="2" style="width:100%;"> </td>
</tr>
<tr>
<td colspan="2" style="width:100%;"> </td>
</tr>
<tr>
<td id="eye" style="width:50%" ondrop="drop(event)" ondragover="allowDrop(event)"></td>
<td id="eye" style="width:50%" ondrop="drop(event)" ondragover="allowDrop(event)"></td>
</tr>
<tr>
<td id="nose" ondrop="drop(event)" ondragover="allowDrop(event)" colspan="2"></td>
</tr>
<tr>
<td id="smile" ondrop="drop(event)" ondragover="allowDrop(event)" colspan="2"></td>
</tr>
</table>
</div>

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　　输出：

　　JS 代码：

function allowDrop(ev) {
ev.preventDefault();
}
function drag(ev) {
ev.dataTransfer.effectAllowed = 'copy';
ev.dataTransfer.setData("text", ev.target.id);
}
function drop(ev) {
ev.preventDefault();
var data = ev.dataTransfer.getData("text");
if (data.indexOf(ev.target.id) == -1) {
ev.dataTransfer.clearData();
}
else {
ev.target.appendChild(document.getElementById(data));
}
}

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　　运行：

　　7. 地理位置信息的获取

　　HTML5 可以共享位置信息，精度和维度都可以通过JS事件来捕捉并返回给服务器来在google 地图中定位。

　　初始化：

　　1. 创建html 页面 Geolocation.html;

　　2. 添加页面元素：

　　JS 代码：

<script type=”text/Javascript”>
var x = document.getElementById("lblDisplay");
function getLocation() {
document.getElementById("header").value = "Static Location";
if (navigator.geolocation) {
var opt = {
timeout: 6000,
maximumAge: 60000,
enableHighAccuracy: true
};
navigator.geolocation.getCurrentPosition(showPosition, errorCallBack, opt);
}
else {
alert('No support for geolocation');
}
}
function showPosition(position) {
x.innerHTML = "Latitude: " + position.coords.latitude +
"Longitude: " + position.coords.longitude;
}
function errorCallBack(e) {
switch (e)
{
case e.PERMISSION_DENIED:
x.innerHTML = "User denied geolocation request";
break;
case e.POSITION_UNAVAILABLE:
x.innerHTML = "No position information available";
break;
case e.TIMEOUT:
x.innerHTML = "Timeout occured";
break;
case e.UNKNOWN_ERROR:
x.innerHTML = "Unknown error";
break;
}
}
</script>

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　　执行：

　　如何实现自定更新位置信息呢?

　　1. 初始化

<input type="button" value="Get My Location Updated" />

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　　2. JS代码

varwatchid;
function getUpdatedLocation() {
document.getElementById("header").value = "Dynamic Location";
if (navigator.geolocation) {
var opt = {
timeout: 500,
maximumAge: 1000,
enableHighAccuracy: true
};
watchid = navigator.geolocation.watchPosition(showPosition, errorCallBack, opt);
}
else {
// no native support; maybe try a fallback?
}
}

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　持续更新位置信息

　　JS代码：

function stopUpdatingLocation() {
if (navigator.geolocation) {
navigator.geolocation.clearWatch(watchid);
}
}

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　　输出：

　　7. 使用Google地图

　　1. 创建HTML 页面

　　2. 添加GOOGLE 地图的引用

　　3. 添加div 元素，并加载地图

　　4. 添加点击按钮来加载地图并输入目的地

　　5. js 代码：

<script type="text/javascript">
function GetMyDirection() {
if (navigator.geolocation) {
var opt = {
timeout: 500,
maximumAge: 1000,
enableHighAccuracy: true
};
navigator.geolocation.getCurrentPosition(showPosition, errorCallBack, opt);
}
else {
alert('No support for geolocation');
}
}
function showPosition(position) {
showInMap(position.coords.latitude, position.coords.longitude);
}
function showInMap(lat, lang) {
vardirectionsService = new google.maps.DirectionsService();
vardirectionsRenderer = new google.maps.DirectionsRenderer();
var route = {
origin: new google.maps.LatLng(lat, lang),
destination: document.getElementById('txtDestination').value, travelMode: google.maps.DirectionsTravelMode.DRIVING
};
varmapOptions = {
zoom: 10,
center: new google.maps.LatLng(50.8504500, 4.3487800),mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("divmap"), mapOptions);
directionsRenderer.setMap(map);
directionsRenderer.setPanel(document.getElementById("divDriveDirection"));
directionsService.route(route, function (result, status) {
if (status === google.maps.DirectionsStatus.OK) {
directionsRenderer.setDirections(result);
}
});
}
function errorCallBack(e) {
switch (e) {
case e.PERMISSION_DENIED:
x.innerHTML = "User denied geolocation request";
break;
case e.POSITION_UNAVAILABLE:
x.innerHTML = "No position information available";
break;
case e.TIMEOUT:
x.innerHTML = "Timeout occured";
break;
case e.UNKNOWN_ERROR:
x.innerHTML = "Unknown error";
break;
}
}
</script>

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　　运行：

来源：http://www.cnblogs.com/powertoolsteam/p/5207818.html?utm_source=tuicool&utm_medium=referral

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