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通过如何通过js实现复制粘贴功能

2017-06-15 13:44 507 查看

在ie中window.clipboardData（剪切板对象）是可以被获取，所以利用这个方法我们可以实现在IE当中复制粘贴的功能，demo如下！

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>clipboard</title>
<SCRIPT language=JavaScript>
function copy()
{
var obj=document.getElementById("txarea");
window.clipboardData.setData("Text",obj.value);//设置数据
alert("复制成功");
}
function paste() {
var obj=document.getElementById("txarea");
var clipboard = window.clipboardData.getData('Text');
clipboard == null ? alert('no data') : obj.value = clipboard;
}
</SCRIPT>
<INPUT name=Button onClick="txarea.value=''" type=button value='clear'>
<INPUT name=Button onClick="copy('textarea')" type=button value='copy'>
<INPUT name=Button onClick="paste('textarea')"; type=button value='paste'><br>
<textarea name="txarea" id="txarea" cols="105" rows="11" class="transform"></textarea></p>
</body>
</html>

上述代码在IE中访问是可以实现复制粘贴的！但是其他浏览器并不被支持！于是找了下资料，由于现在浏览器种类也越来越多，诸如 IE、Firefox、Chrome、Safari等等，因此现在要实现一个js复制内容到剪贴板的小功能就不是一件那么容易的事了。在FLASH 9 时代，有一个通杀所有浏览器的js复制内容到剪贴板的方案：这个方案是一个最流行的方法: 著名的Clipboard Copy解决方案利用一个clipboard.swf作为桥梁，复制内容到剪贴板。原理是：创建一个隐藏的flash文件，同时给给flash的变量FlashVars
赋“clipboard=..”，通过这个赋值flash就会把复制的内容放到剪贴板。这个方法兼容IE、Firefox、Opera、chrome、 Safari，真可谓“万能”的解决方案。浏览器Flash的安装率非常高，这几乎是一个完美的解决方案。

demo如下所示：

<!DOCTYPE HTML>
<html lang="en">
<head>
<meta charset="utf-8"/>
<meta name="copyright" content=""/>
<title>复制粘贴</title>
<body>
<div class="one">
<input type="text" class="gift_num fl" value="XXXXXXXXXXXXXXXXXXXXXX" disabled="disabled" readonly="true"/>
<a href="javascript:;" hidefocus="none" class="btn_copy block fl" id="btnCopy">复制</a>
</div>
</body>
</html>
<script type="text/javascript" src="jquery.min.js"></script>
<script type="text/javascript" src="ZeroClipboard.js"></script>
<script type="text/javascript">
//这里的参数说明一下，text是要复制的文本内容，button是点击触发复制的dom对象,msg是复制成功后的提示信息，parent是包含flash的父元素
function clipboard(text, button, msg, parent) {
if (window.clipboardData) {//如果是IE浏览器
var copyBtn = document.getElementById(button);
copyBtn.onclick = function() {
window.clipboardData.setData('text', text);
alert(msg);
}
} else {//非IE浏览器
var clip = new ZeroClipboard.Client();//初始化一个剪切板对象
clip.setHandCursor(true);//设置手型游标
clip.setText(text);//设置待复制的文本内容
clip.addEventListener("mouseUp", function(client) {//绑定mouseUp事件触发复制
alert(msg);
});
clip.glue(button,parent);//调用ZeroClipboard.js的内置方法处理flash的位置的问题
}
return false;
}
$(function(){
clipboard($(".gift_num").val(),"btnCopy","复制成功",'btnCopy');//调用方式
})
</script>

针对上面的demo，我修改了下ZeroClipboard.js插件里面的代码，以便能在不确定复制按钮在什么位置的情况下可以使用！代码如下：红色是修改过的代码

var ZeroClipboard = {
version: "1.0.7",
clients: {},
moviePath: '/js/ZeroClipboard.swf',
nextId: 1,
$: function(thingy) {
if (typeof(thingy) == 'string') thingy = document.getElementById(thingy);
if (!thingy.addClass) {
thingy.hide = function() {
this.style.display = 'none';
};
thingy.show = function() {
this.style.display = '';
};
thingy.addClass = function(name) {
this.removeClass(name);
this.className += ' ' + name;
};
thingy.removeClass = function(name) {
var classes = this.className.split(/\s+/);
var idx = -1;
for (var k = 0; k < classes.length; k++) {
if (classes[k] == name) {
idx = k;
k = classes.length;
}
}
if (idx > -1) {
classes.splice(idx, 1);
this.className = classes.join(' ');
}
return this;
};
thingy.hasClass = function(name) {
return !!this.className.match(new RegExp("\\s*" + name + "\\s*"));
};
}
return thingy;
},
setMoviePath: function(path) {
this.moviePath = path;
},
dispatch: function(id, eventName, args) {
var client = this.clients[id];
if (client) {
client.receiveEvent(eventName, args);
}
},
register: function(id, client) {
this.clients[id] = client;
},
getDOMObjectPosition: function(obj, stopObj) {
var info = {
left: 0,
top: 0,
width: obj.width ? obj.width : obj.offsetWidth,
height: obj.height ? obj.height : obj.offsetHeight
};
while (obj && (obj != stopObj)) {
info.left += obj.offsetLeft;
info.top += obj.offsetTop;
obj = obj.offsetParent;
console.log(obj);
console.log(stopObj);
}
return info;
},
Client: function(elem) {
this.handlers = {};
this.id = ZeroClipboard.nextId++;
this.movieId = 'ZeroClipboardMovie_' + this.id;
ZeroClipboard.register(this.id, this);
if (elem) this.glue(elem);
}
};
ZeroClipboard.Client.prototype = {
id: 0,
ready: false,
movie: null,
clipText: '',
handCursorEnabled: true,
cssEffects: true,
handlers: null,
glue: function(elem, appendElem, stylesToAdd) {
this.domElement = ZeroClipboard.$(elem);
var zIndex = 9999;
if (this.domElement.style.zIndex) {
zIndex = parseInt(this.domElement.style.zIndex, 10) + 1;
}
if (typeof(appendElem) == 'string') {
if(!($('#'+ appendElem).css("position") == 'relative' || $('#'+ appendElem).css("position") == 'absolute')){
$('#'+ appendElem).css("position","relative");//如果指定的父元素不是相对和决定定位就设置父元素为相对定位
}
appendElem = ZeroClipboard.$(appendElem);
} else if (typeof(appendElem) == 'undefined') {
appendElem = document.getElementsByTagName('body')[0];
}
var box = ZeroClipboard.getDOMObjectPosition(this.domElement, appendElem);
this.div = document.createElement('div');
var style = this.div.style;
style.position = 'absolute';
style.left = '' + box.left + 'px';
style.top = '' + box.top + 'px';
style.width = '' + box.width + 'px';
style.height = '' + box.height + 'px';
style.zIndex = zIndex;
if (typeof(stylesToAdd) == 'object') {
for (addedStyle in stylesToAdd) {
style[addedStyle] = stylesToAdd[addedStyle];
}
}
appendElem.appendChild(this.div);
this.div.innerHTML = this.getHTML(box.width, box.height);
},
getHTML: function(width, height) {
var html = '';
var flashvars = 'id=' + this.id + '&width=' + width + '&height=' + height;
if (navigator.userAgent.match(/MSIE/)) {
var protocol = location.href.match(/^https/i) ? 'https://' : 'http://';
html += '<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="' + protocol + 'download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,0,0" width="' + width + '" height="' + height + '" 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="' + flashvars + '"/><param name="wmode" value="transparent"/></object>';
} else {
html += '<embed id="' + this.movieId + '" src="' + ZeroClipboard.moviePath + '" loop="false" menu="false" quality="best" bgcolor="#ffffff" width="' + width + '" height="' + height + '" name="' + this.movieId + '" align="middle" allowScriptAccess="always" allowFullScreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" flashvars="' + flashvars + '" wmode="transparent" />';
}
return html;
},
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 body = document.getElementsByTagName('body')[0];
try {
body.removeChild(this.div);
} catch (e) {;
}
this.domElement = null;
this.div = null;
}
},
reposition: function(elem) {
if (elem) {
this.domElement = ZeroClipboard.$(elem);
if (!this.domElement) this.hide();
}
if (this.domElement && this.div) {
var box = ZeroClipboard.getDOMObjectPosition(this.domElement);
var style = this.div.style;
style.left = '' + box.left + 'px';
style.top = '' + box.top + 'px';
}
},
setText: function(newText) {
this.clipText = newText;
if (this.ready) this.movie.setText(newText);
},
addEventListener: function(eventName, func) {
eventName = eventName.toString().toLowerCase().replace(/^on/, '');
if (!this.handlers[eventName]) this.handlers[eventName] = [];
this.handlers[eventName].push(func);
},
setHandCursor: function(enabled) {
this.handCursorEnabled = enabled;
if (this.ready) this.movie.setHandCursor(enabled);
},
setCSSEffects: function(enabled) {
this.cssEffects = !!enabled;
},
receiveEvent: function(eventName, args) {
eventName = eventName.toString().toLowerCase().replace(/^on/, '');
switch (eventName) {
case 'load':
this.movie = document.getElementById(this.movieId);
if (!this.movie) {
var self = this;
setTimeout(function() {
self.receiveEvent('load', null);
}, 1);
return;
}
if (!this.ready && navigator.userAgent.match(/Firefox/) && navigator.userAgent.match(/Windows/)) {
var self = this;
setTimeout(function() {
self.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[eventName]) {
for (var idx = 0, len = this.handlers[eventName].length; idx < len; idx++) {
var func = this.handlers[eventName][idx];
if (typeof(func) == 'function') {
func(this, args);
} else if ((typeof(func) == 'object') && (func.length == 2)) {
func[0][func[1]](this, args);
} else if (typeof(func) == 'string') {
window[func](this, args);
}
}
}
}
};

说明：父元素的设置一般情况下就是点击复制的按钮，如有其它的情况下可以修改相应的代码来适合自己的需求！

上述是在前辈已经成熟的代码的基础上做了相应的修改

此方法的要在服务器环境下才可以看到效果！

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