来源:自学PHP网 时间:2014-12-14 21:28 作者: 阅读:次
[导读] 前段时间有个需求是开发富文本编辑器,这个之前随做过,但看了需求,发现有些地方还需google...
就把遇到的问题记录一下。写这篇文章时用的TinyMCE编辑器就很强大,但毕竟是第三方的,项目也考虑了这些,如果做些自定义的东西不太方便。
1. 判断光标位置的元素(或者选中的部分)的样式。光标位置改变的时候更新工具栏对应按钮的样式。什么情况下光标的位置会改变呢?是键盘方向键和鼠标点击,于是就判断键盘事件和鼠标事件来执行光标移动的处理。 a. 获得光标位置或选中元素:首先getSelection,创建range。然后获得元素,获取到元素之后就可以或得样式、tagName等等,做更多的操作,运行代码: 复制代码 代码如下: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <style type="text/css"> p{width:600px;text-align: left;text-indent:2em;line-height:20px;font-size:12px} textarea{width:600px;height:100px;font-size:12px;overflow:auto} </style> </head> <body> <span style="display:block;height:150px; font-size:12px;line-height:150%">信息</span> <script type="text/javascript"> function createEditor(){ var iframe = document.createElement('iframe'); iframe.id = 'iframe'; iframe.frameBorder = 1; iframe.width = 400; iframe.height = 200; document.body.appendChild(iframe); return iframe; } var bind = function(element,eventType,fn,useCapture){ useCapture = useCapture || false; if(arguments.length < 3){ return true }; if(window.addEventListener){ element.addEventListener(eventType, fn, useCapture); }else{ element.attachEvent('on'+eventType,fn, useCapture); } } //from 司徒正美 var css = document.defaultView ? function(el,style){ return document.defaultView.getComputedStyle(el, null).getPropertyValue(style) } : function(el,style){ style = style.replace(/\-(\w)/g, function($, $1){ return $1.toUpperCase(); }); return el.currentStyle[style]; } function bindEditor(){ var iframe = createEditor(); var ifr_win = iframe.contentWindow; var ifr_doc = ifr_win.document; var editorContent = '<span style="font-family: 黑体; font-weight: bold;">阿四大四大四</span>大<span style="font-style: italic; text-decoration: underline;">四大四大打算</span>打打<span style="font-style: italic; color: #ff0000;">双打萨斯</span>大师'; ifr_doc.designMode='On';//可编辑 ifr_doc.contentEditable = true; ifr_doc.open(); ifr_doc.writeln('<html><head><style type="text/css">body{padding:10px;margin:0;font-size:13px;font-family:宋体;text-align:left;overflow:auto;word-wrap: break-word;cursor:text;background-color: transparent; }body,p,font,div,ul,li {line-height: 1.5;}p,font,div,ul,li {line-height: 1.5;margin:0;padding:0}a{color:#548DD4}</style></head><body>'+ editorContent +'</body></html>'); ifr_doc.close(); var getRange = function(){ var range = window.getSelection ? ifr_win.getSelection() : ifr_win.document.selection; if (!range) { return { node : null, range : null, text : null }; } range = range.createRange ? range.createRange() : range.getRangeAt(0); var text = window.getSelection ? range : range.text; var rangeNode = null; if (range.commonAncestorContainer) { rangeNode = range.commonAncestorContainer; } else { if (range.parentElement) rangeNode = range.parentElement(); } return { node : rangeNode, range : range, text : text } } var info = document.getElementsByTagName('span')[0]; var getStyle = function(node){ //console.log(node) var html = ''; html+= '<span style="font-family:'+ css(node,'font-family') +'">字体:'+ css(node,'font-family') + '</span><br />'; html+= '<span style="color:'+ css(node,'color') +'">颜色:'+ css(node,'color') + '</span><br />'; html+= '<span style="font-style:'+ css(node,'font-style') +'">斜体:'+ css(node,'font-style') + '</span><br />'; html+= '<span style="font-weight:'+ css(node,'font-weight') +'">粗体:'+ css(node,'font-weight') + '</span><br />'; html+= '<span style="text-decoration:'+ css(node,'text-decoration') +'">下划线:'+ css(node,'text-decoration') + '</span><br />'; html+= 'tagName:'+ node.tagName + ',style:'+ node.getAttribute('style') +'<br />'; info.innerHTML = html; } //当光标位置改变时候执行 var onselectionchange = function(event){ var e = event || window.event; if(!e.keyCode)e.keyCode = e.which; //方向键移动光标,获取光标位置的dom if((e.keyCode >= 37 && e.keyCode <= 40 )|| e.type == "click"){ var node = getRange().node;//获取光标位置元素 if(node !== null){ while(node.nodeType != 1){ node = node.parentNode; } getStyle(node); } } } bind(ifr_doc,'click',onselectionchange,false); bind(ifr_doc,'keydown',onselectionchange,false); } window.onload = function(){ bindEditor(); } </script> </body> </html> 2. ie不能保持光标位置,这个是在添加超链接时候出现的问题,当不使用浏览器内置的输入框,光标移动其他的文本域里,ie会失去所选中的部分,无法对选中的部分加链接了,解决办法就是:利用range的getBookmark和moveToBookmark,然后给iframe的document绑定onbeforedeactivate(getBookmark)、onactivate(moveTo),这2个事件的大致意思就是,当被激活和失去激活状态。增加事件之后,就不必保存lastRang或者再其他地方设置bookmark了,可以让ie像其他浏览器一样自动保持光标位置了 复制代码 代码如下: if(Util.browser.msie){ Util.bind(this.E.ifr_win.document, "beforedeactivate", function(){ var Rng = _self.getRange().range; _self.rangeBookMark= Rng.getBookmark(); }); Util.bind(this.E.ifr_win.document, "activate", function(){ var Rng = _self.getRange().range; Rng.moveToBookmark(_self.rangeBookMark); Rng.select(); _self.rangeBookMark = null; }); } 3. ie中的撤销与重做 。 当iframe外部有弹出窗口、或者修改html撤销、重做功能将失效。只能归为ie的bug了。。。。也许ie没分清iframe和页面的document,把他们的撤销、重做混道义了。 如下: 复制代码 代码如下: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <style type="text/css"> p{width:600px;text-align: left;text-indent:2em;line-height:20px;font-size:12px} textarea{width:600px;height:100px;font-size:12px;overflow:auto} </style> </head> <body> <span style="display:block;height:150px; font-size:12px;line-height:150%">信息</span> <div id="J_tool"> <input type="button" command="Undo" value="撤销" unselectable="on" /> <input type="button" command="Redo" value="重做" unselectable="on" /> <input type="button" command="Bold" value="粗体" unselectable="on" /> <input type="button" command="Italic" value="斜体" unselectable="on" /> </div> <br /> <input type="button" onclick="changeLayout()" value="点击下,ie将无法撤销、重做" /> <br /> <script type="text/javascript"> function changeLayout(){ var popwin = document.getElementById('popwin'); if(!popwin){ popwin = document.createElement('div'); popwin.id = 'popwin'; popwin.style.cssText = 'display:none;width:300px;height:150px;background-color:#ccc;position:absolute;left:0;top:0px;text-align:center;line-height:150px;'; popwin.innerHTML = '改变了layoud渲染,ie将无法撤销、重做'; document.body.appendChild(popwin); popwin.onclick= function(){this.style.display = 'none'}; } popwin.style.display = popwin.style.display == 'none' ? 'block' : 'none'; } function createEditor(){ var iframe = document.createElement('iframe'); iframe.id = 'iframe'; iframe.frameBorder = 1; iframe.width = 400; iframe.height = 200; document.body.appendChild(iframe); return iframe; } var bind = function(element,eventType,fn,useCapture){ useCapture = useCapture || false; if(arguments.length < 3){ return true }; if(window.addEventListener){ element.addEventListener(eventType, fn, useCapture); }else{ element.attachEvent('on'+eventType,fn, useCapture); } } //from 司徒正美 var css = document.defaultView ? function(el,style){ return document.defaultView.getComputedStyle(el, null).getPropertyValue(style) } : function(el,style){ style = style.replace(/\-(\w)/g, function($, $1){ return $1.toUpperCase(); }); return el.currentStyle[style]; } function bindEditor(){ var iframe = createEditor(); var ifr_win = iframe.contentWindow; var ifr_doc = ifr_win.document; var editorContent = '<span style="font-family: 黑体; font-weight: bold;">阿四大四大四</span>大<span style="font-style: italic; text-decoration: underline;">四大四大打算</span>打打<span style="font-style: italic; color: #ff0000;">双打萨斯</span>大师'; ifr_doc.designMode='On';//可编辑 ifr_doc.contentEditable = true; ifr_doc.open(); ifr_doc.writeln('<html><head><style type="text/css">body{padding:10px;margin:0;font-size:13px;font-family:宋体;text-align:left;overflow:auto;word-wrap: break-word;cursor:text;background-color: transparent; }body,p,font,div,ul,li {line-height: 1.5;}p,font,div,ul,li {line-height: 1.5;margin:0;padding:0}a{color:#548DD4}</style></head><body>'+ editorContent +'</body></html>'); ifr_doc.close(); var getRange = function(){ var range = window.getSelection ? ifr_win.getSelection() : ifr_win.document.selection; if (!range) { return { node : null, range : null, text : null }; } range = range.createRange ? range.createRange() : range.getRangeAt(0); var text = window.getSelection ? range : range.text; var rangeNode = null; if (range.commonAncestorContainer) { rangeNode = range.commonAncestorContainer; } else { if (range.parentElement) rangeNode = range.parentElement(); } return { node : rangeNode, range : range, text : text } } var info = document.getElementsByTagName('span')[0]; var getStyle = function(node){ //console.log(node) var html = ''; html+= '<span style="font-family:'+ css(node,'font-family') +'">字体:'+ css(node,'font-family') + '</span><br />'; html+= '<span style="color:'+ css(node,'color') +'">颜色:'+ css(node,'color') + '</span><br />'; html+= '<span style="font-style:'+ css(node,'font-style') +'">斜体:'+ css(node,'font-style') + '</span><br />'; html+= '<span style="font-weight:'+ css(node,'font-weight') +'">粗体:'+ css(node,'font-weight') + '</span><br />'; html+= '<span style="text-decoration:'+ css(node,'text-decoration') +'">下划线:'+ css(node,'text-decoration') + '</span><br />'; html+= 'tagName:'+ node.tagName + ',style:'+ node.getAttribute('style') +'<br />'; info.innerHTML = html; } //当光标位置改变时候执行 var onselectionchange = function(event){ var e = event || window.event; if(!e.keyCode)e.keyCode = e.which; //方向键移动光标,获取光标位置的dom if((e.keyCode >= 37 && e.keyCode <= 40 )|| e.type == "click"){ var node = getRange().node;//获取光标位置元素 if(node !== null){ while(node.nodeType != 1){ node = node.parentNode; } getStyle(node); } } } bind(ifr_doc,'click',onselectionchange,false); bind(ifr_doc,'keydown',onselectionchange,false); bind(document.getElementById('J_tool'),'click',function(event){ event = event || window.event; var target = event.srcElement || event.target; var command = target.getAttribute('command'); var param = target.getAttribute('param') || ''; ifr_doc.execCommand(command,false,param); return false; }) } window.onload = function(){ bindEditor(); } </script> </body> </html> 如何解决呢? 只能依靠javascript模拟撤销与重做了。网络这方面的资源还是不少的,就不在此详细说明了 |
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