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Javascript復(fù)制實(shí)例詳解

更新時(shí)間：2016年01月28日 14:05:42 作者：chenpingzhao

最近接了個(gè)項(xiàng)目，其中有項(xiàng)目需求是這樣的，需要復(fù)制內(nèi)容到剪切板，因?yàn)橛斜姸酁g覽器，所以兼容性很重要，下面通過本文給大家介紹Javascript復(fù)制實(shí)例詳解，對(duì)js復(fù)制相關(guān)知識(shí)感興趣的朋友一起學(xué)習(xí)吧

在做項(xiàng)目時(shí)有一個(gè)需求，是需要復(fù)制內(nèi)容到剪切板，因?yàn)橛斜姸酁g覽器，所以要兼容性很重要。

1、最簡(jiǎn)單的copy，只能在IE下使用

使用clipboardData方法

<script type="text/javascript">
function copy(){
window.clipboardData.setData("text",document.getElementById("name").value);
alert("The text is on the clipboard, try to paste it!");
}
</script>

2、跨瀏覽器的，但是Firefox無法復(fù)制

<head>
<script type="text/javascript">
function CopyToClipboard () {
var input = document.getElementById ("toClipboard");
var textToClipboard = input.value;
var success = true;
if (window.clipboardData) { // Internet Explorer
window.clipboardData.setData ("Text", textToClipboard);
}
else {
// create a temporary element for the execCommand method
var forExecElement = CreateElementForExecCommand (textToClipboard);
/* Select the contents of the element 
(the execCommand for 'copy' method works on the selection) */
SelectContent (forExecElement);
var supported = true;
// UniversalXPConnect privilege is required for clipboard access in Firefox
try {
if (window.netscape && netscape.security) {
netscape.security.PrivilegeManager.enablePrivilege ("UniversalXPConnect");
}
// Copy the selected content to the clipboard
// Works in Firefox and in Safari before version 5
success = document.execCommand ("copy", false, null);
}
catch (e) {
success = false;
}
// remove the temporary element
document.body.removeChild (forExecElement);
}
if (success) {
alert ("The text is on the clipboard, try to paste it!");
}
else {
alert ("Your browser doesn't allow clipboard access!");
}
}
function CreateElementForExecCommand (textToClipboard) {
var forExecElement = document.createElement ("div");
// place outside the visible area
forExecElement.style.position = "absolute";
forExecElement.style.left = "-10000px";
forExecElement.style.top = "-10000px";
// write the necessary text into the element and append to the document
forExecElement.textContent = textToClipboard;
document.body.appendChild (forExecElement);
// the contentEditable mode is necessary for the execCommand method in Firefox
forExecElement.contentEditable = true;
return forExecElement;
}
function SelectContent (element) {
// first create a range
var rangeToSelect = document.createRange ();
rangeToSelect.selectNodeContents (element);
// select the contents
var selection = window.getSelection ();
selection.removeAllRanges ();
selection.addRange (rangeToSelect);
}
</script>
</head>
<body>
<input id="toClipboard" value="text to clipboard"/>
<button onclick='CopyToClipboard ()'>Copy text to clipboard</button>
</body>

測(cè)試后，F(xiàn)irefox訪問失敗

3、萬能的flash

不要重復(fù)造輪子了，有一個(gè)使用廣泛的類庫(kù)ZeroClipboard

Zero Clipboard 的實(shí)現(xiàn)原理

Zero Clipboard 利用 Flash 進(jìn)行復(fù)制，之前有 Clipboard Copy 解決方案，其利用的是一個(gè)隱藏的 Flash。但最新的 Flash Player 10 只允許在 Flash 上進(jìn)行操作才能啟動(dòng)剪貼板。所以 Zero Clipboard 對(duì)此進(jìn)行了改進(jìn)，用了一個(gè)透明的 Flash ，讓其漂浮在按鈕之上，這樣其實(shí)點(diǎn)擊的不是按鈕而是 Flash ，也就可以使用 Flash 的復(fù)制功能了。

創(chuàng)建一個(gè)透明的flash

將這個(gè)flash浮在按鈕上層

確定要復(fù)制的文本是什么

監(jiān)聽這個(gè)透明flash的鼠標(biāo)點(diǎn)擊事件

該flash被點(diǎn)擊之后，完成剪切板處理

對(duì)于這幾件事，ZeroClipboard分別提供了不同的api，來完成整個(gè)需求

如何使用 Zero Clipboard

git clone https://github.com/chenpingzhao/easycopy.git

關(guān)于ZeroClipboard.js

var ZeroClipboard = {
version: "1.0.7",
clients: {},
moviePath: "zeroclipboard.swf",
nextId: 1,
$: function(A) {
if (typeof(A) == "string") {
A = document.getElementById(A)
}
if (!A.addClass) {
A.hide = function() {
this.style.display = "none"
};
A.show = function() {
this.style.display = ""
};
A.addClass = function(B) {
this.removeClass(B);
this.className += " " + B
};
A.removeClass = function(D) {
var E = this.className.split(/\s+/);
var B = -1;
for (var C = 0; C < E.length; C++) {
if (E[C] == D) {
B = C;
C = E.length
}
}
if (B > -1) {
E.splice(B, 1);
this.className = E.join(" ")
}
return this
};
A.hasClass = function(B) {
return !!this.className.match(new RegExp("\\s*" + B + "\\s*"))
}
}
return A
},
setMoviePath: function(A) {
this.moviePath = A
},
dispatch: function(D, B, C) {
var A = this.clients[D];
if (A) {
A.receiveEvent(B, C)
}
},
register: function(B, A) {
this.clients[B] = A
},
getDOMObjectPosition: function(C, A) {
var B = {
left: 0,
top: 0,
width: C.width ? C.width : C.offsetWidth,
height: C.height ? C.height : C.offsetHeight
};
while (C && (C != A)) {
B.left += C.offsetLeft;
B.top += C.offsetTop;
C = C.offsetParent
}
return B
},
Client: function(A) {
this.handlers = {};
this.id = ZeroClipboard.nextId++;
this.movieId = "ZeroClipboardMovie_" + this.id;
ZeroClipboard.register(this.id, this);
if (A) {
this.glue(A)
}
}
};
ZeroClipboard.Client.prototype = {
id: 0,
ready: false,
movie: null,
clipText: "",
handCursorEnabled: true,
cssEffects: true,
handlers: null,
//我們可以通過下面這個(gè)api，將flash和按鈕重疊，且浮在按鈕之上
glue: function(D, B, E) {
this.domElement = ZeroClipboard.$(D);
var F = 99;
if (this.domElement.style.zIndex) {
F = parseInt(this.domElement.style.zIndex, 10) + 1
}
if (typeof(B) == "string") {
B = ZeroClipboard.$(B)
} else {
if (typeof(B) == "undefined") {
B = document.getElementsByTagName("body")[0]
}
}
var C = ZeroClipboard.getDOMObjectPosition(this.domElement, B);
this.div = document.createElement("div");
var A = this.div.style;
A.position = "absolute";
A.left = "" + C.left + "px";
A.top = "" + C.top + "px";
A.width = "" + C.width + "px";
A.height = "" + C.height + "px";
A.zIndex = F;
if (typeof(E) == "object") {
for (addedStyle in E) {
A[addedStyle] = E[addedStyle]
}
}
B.appendChild(this.div);
this.div.innerHTML = this.getHTML(C.width, C.height)
},
/*IE 的 Flash JavaScript 通信接口上有一個(gè) bug 。
你必須插入一個(gè) object 標(biāo)簽到一個(gè)已存在的 DOM 元素中。并且在寫入 innerHTML 之前請(qǐng)確保該元素已經(jīng) appendChild 方法插入到 DOM 中*/
getHTML: function(D, A) {
var C = "";
var B = "id=" + this.id + "&width=" + D + "&height=" + A;
if (navigator.userAgent.match(/MSIE/)) {
var E = location.href.match(/^https/i) ? "https://" : "http://";
C += '<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="' + E + 'download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,0,0" width="' + D + '" height="' + A + '" id="' + this.movieId + '" align="middle"><param name="allowScriptAccess" value="always" /><param name="allowFullScreen" value="false" /><param name="movie" value="' + ZeroClipboard.moviePath + '" /><param name="loop" value="false" /><param name="menu" value="false" /><param name="quality" value="best" /><param name="bgcolor" value="#ffffff" /><param name="flashvars" value="' + B + '"/><param name="wmode" value="transparent"/></object>'
} else {
C += '<embed id="' + this.movieId + '" src="' + ZeroClipboard.moviePath + '" loop="false" menu="false" quality="best" bgcolor="#ffffff" width="' + D + '" height="' + A + '" name="' + this.movieId + '" align="middle" allowScriptAccess="always" allowFullScreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" flashvars="' + B + '" wmode="transparent" />'
}
return C
},
hide: function() {
if (this.div) {
this.div.style.left = "-2000px"
}
},
show: function() {
this.reposition()
},
destroy: function() {
if (this.domElement && this.div) {
this.hide();
this.div.innerHTML = "";
var A = document.getElementsByTagName("body")[0];
try {
A.removeChild(this.div)
} catch (B) {}
this.domElement = null;
this.div = null
}
},
/* 因?yàn)榘粹o上漂浮有一個(gè) Flash 按鈕，所以當(dāng)頁面大小發(fā)生變化時(shí)，F(xiàn)lash 按鈕可能會(huì)錯(cuò)位，就點(diǎn)不著了
Zero Clipboard 提供了一個(gè) reposition() 方法，可以重新計(jì)算 Flash 按鈕的位置。我們可以將它綁定到 resize 事件上
bind(window, "resize", function(){ clip.reposition(); }); 
function bind(obj, type, fn) {
if (obj.attachEvent) {
obj['e' + type + fn] = fn;
obj[type + fn] = function() {
obj['e' + type + fn](window.event);
}
obj.attachEvent('on' + type, obj[type + fn]);
} else
obj.addEventListener(type, fn, false);
}*/
reposition: function(C) {
if (C) {
this.domElement = ZeroClipboard.$(C);
if (!this.domElement) {
this.hide()
}
}
if (this.domElement && this.div) {
var B = ZeroClipboard.getDOMObjectPosition(this.domElement);
var A = this.div.style;
A.left = "" + B.left + "px";
A.top = "" + B.top + "px"
}
},
setText: function(A) {
this.clipText = A;
if (this.ready) {
this.movie.setText(A)
}
},
addEventListener: function(A, B) {
A = A.toString().toLowerCase().replace(/^on/, "");
if (!this.handlers[A]) {
this.handlers[A] = []
}
this.handlers[A].push(B)
},
setHandCursor: function(A) {
this.handCursorEnabled = A;
if (this.ready) {
this.movie.setHandCursor(A)
}
},
/*鼠標(biāo)移到按鈕上或點(diǎn)擊時(shí)，由于有 Flash 按鈕的遮擋，所以像 css ":hover", ":active" 等偽類可能會(huì)失效。
setCSSEffects() 方法就是解決這個(gè)問題。首先我們需要將偽類改成類
copy - botton: hover {
border - color: #FF6633;
}

可以改成下面的 ":hover" 改成 ".hover"

copy - botton.hover {
border - color: #FF6633;
}

我們可以調(diào)用 clip.setCSSEffects( true ); 這樣 Zero Clipboard 會(huì)自動(dòng)為我們處理：將類 .hover 當(dāng)成偽類 :hover*/

setCSSEffects: function(A) {
this.cssEffects = !! A
},
/*Zero Clipboard 提供了一些事件，你可以自定義函數(shù)處理這些事件。
Zero Clipboard 事件處理函數(shù)為 addEventListener(); 例如當(dāng) Flash 完全載入后會(huì)觸發(fā)一個(gè)事件 "load" 
clip.addEventListener( "load", function(client) { 
alert("Flash 加載完畢！"); 
});*/
receiveEvent: function(D, E) {
D = D.toString().toLowerCase().replace(/^on/, "");
switch (D) {
case "load":
this.movie = document.getElementById(this.movieId);
if (!this.movie) {
var C = this;
setTimeout(function() {
C.receiveEvent("load", null)
}, 1);
return
}
if (!this.ready && navigator.userAgent.match(/Firefox/) && navigator.userAgent.match(/Windows/)) {
var C = this;
setTimeout(function() {
C.receiveEvent("load", null)
}, 100);
this.ready = true;
return
}
this.ready = true;
this.movie.setText(this.clipText);
this.movie.setHandCursor(this.handCursorEnabled);
break;
case "mouseover":
if (this.domElement && this.cssEffects) {
this.domElement.addClass("hover");
if (this.recoverActive) {
this.domElement.addClass("active")
}
}
break;
case "mouseout":
if (this.domElement && this.cssEffects) {
this.recoverActive = false;
if (this.domElement.hasClass("active")) {
this.domElement.removeClass("active");
this.recoverActive = true
}
this.domElement.removeClass("hover")
}
break;
case "mousedown":
if (this.domElement && this.cssEffects) {
this.domElement.addClass("active")
}
break;
case "mouseup":
if (this.domElement && this.cssEffects) {
this.domElement.removeClass("active");
this.recoverActive = false
}
break
}
if (this.handlers[D]) {
for (var B = 0, A = this.handlers[D].length; B < A; B++) {
var F = this.handlers[D][B];
if (typeof(F) == "function") {
F(this, E)
} else {
if ((typeof(F) == "object") && (F.length == 2)) {
F[0][F[1]](this, E)
} else {
if (typeof(F) == "string") {
window[F](this, E)
}
}
}
}
}
}
};

以上所述是小編給大家介紹的Javascript復(fù)制實(shí)例詳解，希望對(duì)大家有所幫助。

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