通過如何通過js實現複製貼上功能
阿新 • • 發佈：2019-01-27
在ie中window.clipboardData（剪下板物件）是可以被獲取，所以利用這個方法我們可以實現在IE當中複製貼上的功能，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);//設定資料 alert("複製成功"); } 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>
上述程式碼在IE中訪問是可以實現複製貼上的！但是其他瀏覽器並不被支援！於是找了下資料，由於現在瀏覽器種類也越來越多，諸如 IE、Firefox、Chrome、Safari等等，因此現在要實現一個js複製內容到剪貼簿的小功能就不是一件那麼容易的事了。 在FLASH 9 時代，有一個通殺所有瀏覽器的js複製內容到剪貼簿的方案：這個方案是一個最流行的方法: 著名的Clipboard Copy解決方案 利用一個clipboard.swf作為橋樑，複製內容到剪貼簿。原理是：建立一個隱藏的flash檔案，同時給給flash的變數FlashVars 賦“clipboard=..”，通過這個賦值flash就會把複製的內容放到剪貼簿。這個方法相容IE、Firefox、Opera、chrome、 Safari，真可謂“萬能”的解決方案。瀏覽器Flash的安裝率非常高，這幾乎是一個完美的解決方案。
demo如下所示：
<!DOCTYPE HTML> <html lang="en"> <head> <meta charset="utf-8"/> <meta name="copyright" content=""/> <title>複製貼上</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">複製</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"> //這裡的引數說明一下，text是要複製的文字內容，button是點選觸發複製的dom物件,msg是複製成功後的提示資訊，parent是包含flash的父元素 function clipboard(text, button, msg, parent) { if (window.clipboardData) {//如果是IE瀏覽器 var copyBtn = document.getElementById(button); copyBtn.onclick = function() { window.clipboardData.setData('text', text); alert(msg); } } else {//非IE瀏覽器 var clip = new ZeroClipboard.Client();//初始化一個剪下板物件 clip.setHandCursor(true);//設定手型遊標 clip.setText(text);//設定待複製的文字內容 clip.addEventListener("mouseUp", function(client) {//繫結mouseUp事件觸發複製 alert(msg); }); clip.glue(button,parent);//呼叫ZeroClipboard.js的內建方法處理flash的位置的問題 } return false; } $(function(){ clipboard($(".gift_num").val(),"btnCopy","複製成功",'btnCopy');//呼叫方式 }) </script>
針對上面的demo，我修改了下ZeroClipboard.js外掛裡面的程式碼，以便能在不確定複製按鈕在什麼位置的情況下可以使用！程式碼如下：紅色是修改過的程式碼
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')){ $('#'+ appendElem).css("position","relative");//如果指定的父元素不是相對和決定定位就設定父元素為相對定位 } appendElem = ZeroClipboard.$(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); } } } } };
說明：父元素的設定一般情況下就是點選複製的按鈕，如有其它的情況下可以修改相應的程式碼來適合自己的需求！
上述是在前輩已經成熟的程式碼的基礎上做了相應的修改
此方法的要在伺服器環境下才可以看到效果！