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使用html5的拖放对图片进行拖拽遇到了问题，求大神帮忙_html/css_WEB-ITnose
<!DOCTYPE html> <html> <head> <title>审批流实现(Flex转向Html5)第一版</title> <link rel="stylesheet" type="text/css" href="style.css"> <!--定义本html的样式--> <style type="text/css"> </style> <!--定义本html的js--> <script type="text/javascript"> /* function changeTabList1(element){ var theTab=element.parentNode; var _tabList=document.getElementById("tablist1"); var DIVs=_tabList.getElementsByTagName("DIV"); for(i=0;i<DIVs.length;i++){ DIVs[i].className="tab_normal"; } theTab.className="tab_nonce"; } function changeTabList2(element){ var theTab=element.parentNode; var _tabList=document.getElementById("tablist2"); var DIVs=_tabList.getElementsByTagName("DIV"); for(i=0;i<DIVs.length;i++){ DIVs[i].className="tab_normal"; } theTab.className="tab_nonce"; } */ <!--控制拖放的事件--> //这个数组用来保存图像的信息 var images=[]; //对放置目标canvas_liuchengtu的引用 var imagesDropTarget; function loadDemo(){ imagesDropTarget=document.getElementById("canvas_liuchengtu"); //放置目标注册了dragenter、dragover、dragleave和drop事件处理器 imagesDropTarget.addEventListener("dragenter",handleDragEnter,false); imagesDropTarget.addEventListener("dragover",handleDragOver,false); imagesDropTarget.addEventListener("dragleave",handleDragLeave,false); imagesDropTarget.addEventListener("drop",handleDrop,false); var table_liuchengtu=document.getElementById("table_liuchengtu"); table_liuchengtu.addEventListener("dragover",handleDragOverOuter,false); //每个可拖动的成员都有拖动开始和结束事件处理器 var members=document.querySelectorAll("img"); [].forEach.call(members,function(member){ member.addEventListener("dragstart",handleDragStart,false); member.addEventListener("dragend",handleDragEnd,false); }); } window.addEventListener("load",loadDemo,false); //开始拖动时调用 function handleDragStart(evt){ //拖动只支持copy操作 evt.effectAllowed="copy"; //高亮潜在的放置目标 imagesDropTarget.className="validtarget"; //拖动起始目标是成员之一 //成员的数据是png图像 evt.dataTransfer.setData("image/png",evt.target.textContent);//////////////////////////////////// return true; } //停止传播，阻止默认的拖动动作将我们的目标列表显示为有效的放置目标 function handleDragEnter(evt){ evt.stopPropagation(); evt.preventDefault(); return false; } function handleDragOverOuter(evt){ if(evt.target.id=="table_liuchengtu") imagesDropTarget.className="validtarget"; evt.stopPropagation(); evt.preventDefault(); return false; } function handleDragLeave(evt){ return false; } //如果用户鼠标悬停在canvas上 //会显示为允许复制，同时为了提供更好的反馈效果，目标列表被高亮显示 function handleDragOver(evt){ evt.dataTransfer.dropEffect="copy"; evt.stopPropagation(); evt.preventDefault(); imagesDropTarget.className="highlighted"; return false; } function handleDrop(evt){ evt.preventDefault(); evt.stopPropagation(); } //确保清空所有的拖放操作 function handleDragEnd(evt){ //恢复潜在放置目标样式 imagesList.className=null; return false; } </script> </head> <body> <div id="main" height="500" width="800"> <div id="main_head_button" height="45" width="100%" style="border:1px solid #A3C0E8"> <input id="new" class="button_new" type="button" value="新建"> <input id="save" class="button_save" type="button" value="保存"> <input id="close" class="button_close" type="button" value="关闭"> </div> <table id="main_body_table" width="100%" height="90%" border="0" cellspacing="0" cellpadding="0"> <tr height="100%"> <td width="40%" height="100%"> <table style="border:1px solid #00FF00"> <!--tab切换的位置--> <tr> <td id="tablist1" style="border:1px solid #FFFF00"> <div class="tab_nonce"><a href="#" onClick="changeTabList1(this)">流程控件</a></div> <div class="tab_normal"><a href="#" onClick="changeTabList1(this)">人力资源</a></div> </td> </tr> <!--accordiond的位置--> <tr> <td> <div id="div_components"> <div id="bar_liucheng"> <label>流程监控</label> </div> <div id="div_image" valign="bottom" align="left"> <table id="div_image_table" border="1" cellspacing="0" cellpadding="0"> <tr> <td width="80px" height="55px" align="center"> <span draggable="true"> <img src="/static/imghw/default1.png" data-src="image/4.png" class="lazy" alt="使用html5的拖放对图片进行拖拽遇到了问题，求大神帮忙_html/css_WEB-ITnose" > </span> <div> <label>选择</label> </div> </td> <td width="80px" height="55px" align="center"> <span draggable="true"> <img src="/static/imghw/default1.png" data-src="image/2.png" class="lazy" alt="使用html5的拖放对图片进行拖拽遇到了问题，求大神帮忙_html/css_WEB-ITnose" > </span> <div> <label>连线</label> </div> </td> <td width="80px" height="55px" align="center"> <span draggable="true"> <img src="/static/imghw/default1.png" data-src="image/9.png" class="lazy" alt="使用html5的拖放对图片进行拖拽遇到了问题，求大神帮忙_html/css_WEB-ITnose" > </span> <div> <label>开始</label> </div> </td> </tr> <tr> <td width="80px" height="55px" align="center"> <span draggable="true"> <img src="/static/imghw/default1.png" data-src="image/10.png" class="lazy" alt="使用html5的拖放对图片进行拖拽遇到了问题，求大神帮忙_html/css_WEB-ITnose" > </span> <div> <label>结束</label> </div> </td> <td width="80px" height="55px" align="center"> <span draggable="true"> <img src="/static/imghw/default1.png" data-src="image/7.png" class="lazy" alt="使用html5的拖放对图片进行拖拽遇到了问题，求大神帮忙_html/css_WEB-ITnose" > </span> <div> <label>异步分支</label> </div> </td> <td width="80px" height="55px" align="center"> <span draggable="true"> <img src="/static/imghw/default1.png" data-src="image/7.png" class="lazy" alt="使用html5的拖放对图片进行拖拽遇到了问题，求大神帮忙_html/css_WEB-ITnose" > </span> <div> <label>同步分支</label> </div> </td> </tr> </table> </div> </div> </div> </td> </tr> <!--一个div和table的位置--> <tr> <td> <div id="div_shuxingkuang"> <div id="bar_shuxingkuang"><label>属性对话框</label></div> <table id="table_shuxingkuang" border="1" cellspacing="0" cellpadding="0"> <tr> <th width="150px">名称</th> <th width="150px">值</th> </tr> <tr> <td width="150px">fdsf</td> <td width="150px">fsdf</td> </tr> <tr> <td width="150px">fdsf</td> <td width="150px">fsdf</td> </tr> <tr> <td width="150px">fsdf</td> <td width="150px">fasdf</td> </tr> <tr> <td width="150px">fsdf</td> <td width="150px">fsad</td> </tr> </table> </div> </td> </tr> </table> </td> <td width="60%" style="max-width:90%"> <!--canvas--> <table id="table_liuchengtu" style="border:1px solid #00FF00"> <!--tab切换的位置--> <tr> <td id="tablist2" style="border:1px solid #FFFF00"> <div class="tab_nonce"><a href="#" onClick="changeTabList2(this)">流程图</a></div> <div class="tab_normal"><a href="#" onClick="changeTabList2(this)">html</a></div> </td> <!--accordiond的位置--> <tr> <td> <div id="canvas_liuchengtu"> <!--拖动放置目标区域--> </div> </td> </tr> </tr> </table> </td> </tr> </table> </div> </body> </html> Copy after login
问题补充：目标功能：我想把那几个png的图片拖放到下面的canvas（刚才修改成了div，发布问题时忘了改了）中，我注册了事件处理器和编写了dragstart、dragend、dragenter、dragleave、dragover、drop。
我昨天研究了一下午了，今天也弄了一上午了，还是不行，求大家帮忙看看：
1.在handleDragStart中的这句话evt.dataTransfer.setData("image/png",evt.target.textContent);中第二个参数怎么写，现在写的是处理文本的，而卧要处理图像
2.我以前看书写过处理文本的，但按照我的理解去处理图像时那个handleDrop不对，所以我把函数里面的内容删了，求您帮我看看怎么写，最好帮我写出来，我知道这样很不好，但我是真的不会了，我已经按照《html5程序设计 第二版》中的例子琢磨快一天了，求帮忙啊
回复讨论(解决方案)
你太笨了，看下面：
<!DOCTYPE html><html><head> <title>审批流实现(Flex转向Html5)第一版</title> <link rel="stylesheet" type="text/css" href="style.css"> <!--定义本html的样式--> <style type="text/css"> .highlighted { background-color: yellow; } .validtarget { background-color: lightblue; } </style> <!--定义本html的js--> <script type="text/javascript"> <!--控制拖放的事件--> //对放置目标canvas_liuchengtu的引用 var imagesDropTarget; function loadDemo(){ imagesDropTarget=document.getElementById("div_liuchengtu"); //放置目标注册了dragenter、dragover、dragleave和drop事件处理器 imagesDropTarget.addEventListener("dragenter",handleDragEnter,false); imagesDropTarget.addEventListener("dragover",handleDragOver,false); imagesDropTarget.addEventListener("dragleave",handleDragLeave,false); imagesDropTarget.addEventListener("drop",handleDrop,false); //放置目标div_liuchengtu外围的td起到缓冲作用，用来重置放置目标区域的样式 var td_liuchengtu=document.getElementById("td_liuchengtu"); td_liuchengtu.addEventListener("dragover",handleDragOverOuter,false); //每个可拖动的成员都有拖动开始和结束事件处理器 var members=document.querySelectorAll("img"); [].forEach.call(members,function(member){ member.addEventListener("dragstart",handleDragStart,false); member.addEventListener("dragend",handleDragEnd,false); }); } window.addEventListener("load",loadDemo,false); //"dragstart" 开始拖动时调用 function handleDragStart(evt){ //拖动只支持copy操作 evt.effectAllowed="copy"; //高亮潜在的放置目标 imagesDropTarget.className="validtarget"; //拖动起始目标是成员之一 //成员的数据是png图像 evt.dataTransfer.setData("image/png",evt.target.id); //alert(evt.target.id); return true; } //"dragenter" 停止传播，阻止默认的拖动动作将我们的目标列表显示为有效的放置目标 function handleDragEnter(evt){ evt.stopPropagation(); evt.preventDefault(); return false; } //"dragover" 如果用户鼠标悬停在canvas上会显示为允许复制，同时为了提供更好的反馈效果，目标列表被高亮显示 function handleDragOver(evt){ evt.dataTransfer.dropEffect="copy"; evt.stopPropagation(); evt.preventDefault(); imagesDropTarget.className="highlighted"; return false; } //"dragleave" function handleDragLeave(evt){ return false; } //"drop" function handleDrop(evt){ evt.preventDefault(); evt.stopPropagation(); //使用image类型获取拖动项中的图像 var image=evt.dataTransfer.getData("image/png"); evt.dataTransfer.dropEffect="copy"; var dsa=document.getElementById(image); imagesDropTarget.innerHTML+="<img src="/static/imghw/default1.png" data-src="image/4.png" class="lazy" +dsa.src+"'/ alt="使用html5的拖放对图片进行拖拽遇到了问题，求大神帮忙_html/css_WEB-ITnose" >"; } //为了实现更好的放置反馈效果，我们将td元素上的dragover事件作为关闭目标区域高亮效果的标记 function handleDragOverOuter(evt){ if(evt.target.id=="td_liuchengtu") imagesDropTarget.className="validtarget"; evt.stopPropagation(); return false; } //"dragend" 确保清空所有的拖放操作 function handleDragEnd(evt){ //恢复潜在放置目标样式 imagesDropTarget.className=null; return false; } </script></head><body> <div id="main" style="max-width:90%" width="800"> <div id="main_head_button" height="45" width="100%" style="border:1px solid #A3C0E8"> <input id="new" class="button_new" type="button" value="新建"> <input id="save" class="button_save" type="button" value="保存"> <input id="close" class="button_close" type="button" value="关闭"> </div> <table id="main_body_table" width="100%" height="90%" border="0" cellspacing="0" cellpadding="0"> <tr height="100%"> <td width="40%" height="100%"> <table style="border:1px solid #00FF00"> <!--tab切换的位置--> <tr> <td id="tablist1" style="border:1px solid #FFFF00"> <div class="tab_nonce"><a href="#" onClick="changeTabList1(this)">流程控件</a></div> <div class="tab_normal"><a href="#" onClick="changeTabList1(this)">人力资源</a></div> </td> </tr> <!--accordiond的位置--> <tr> <td> <div id="div_components"> <div id="bar_liucheng"> <label>流程监控</label> </div> <div id="div_image" valign="bottom" align="left"> <table id="div_image_table" border="1" cellspacing="0" cellpadding="0"> <tr> <td width="80px" height="55px" align="center"> <span draggable="true"> <img src="/static/imghw/default1.png" data-src="image/4.png" class="lazy" id="a" alt="使用html5的拖放对图片进行拖拽遇到了问题，求大神帮忙_html/css_WEB-ITnose" > </span> <div> <label>选择</label> </div> </td> <td width="80px" height="55px" align="center"> <span draggable="true"> <img src="/static/imghw/default1.png" data-src="image/2.png" class="lazy" id="b" alt="使用html5的拖放对图片进行拖拽遇到了问题，求大神帮忙_html/css_WEB-ITnose" > </span> <div> <label>连线</label> </div> </td> <td width="80px" height="55px" align="center"> <span draggable="true"> <img src="/static/imghw/default1.png" data-src="image/9.png" class="lazy" id="c" alt="使用html5的拖放对图片进行拖拽遇到了问题，求大神帮忙_html/css_WEB-ITnose" > </span> <div> <label>开始</label> </div> </td> </tr> <tr> <td width="80px" height="55px" align="center"> <span draggable="true"> <img src="/static/imghw/default1.png" data-src="image/10.png" class="lazy" id="d" alt="使用html5的拖放对图片进行拖拽遇到了问题，求大神帮忙_html/css_WEB-ITnose" > </span> <div> <label>结束</label> </div> </td> <td width="80px" height="55px" align="center"> <span draggable="true"> <img src="/static/imghw/default1.png" data-src="image/7.png" class="lazy" id="e" alt="使用html5的拖放对图片进行拖拽遇到了问题，求大神帮忙_html/css_WEB-ITnose" > </span> <div> <label>异步分支</label> </div> </td> <td width="80px" height="55px" align="center"> <span draggable="true"> <img src="/static/imghw/default1.png" data-src="image/7.png" class="lazy" id="f" alt="使用html5的拖放对图片进行拖拽遇到了问题，求大神帮忙_html/css_WEB-ITnose" > </span> <div> <label>同步分支</label> </div> </td> </tr> </table> </div> </div> </div> </td> </tr> <!--一个div和table的位置--> <tr> <td> <div id="div_shuxingkuang"> <div id="bar_shuxingkuang"><label>属性对话框</label></div> <table id="table_shuxingkuang" border="1" cellspacing="0" cellpadding="0"> <tr> <th width="150px">名称</th> <th width="150px">值</th> </tr> <tr> <td width="150px">fdsf</td> <td width="150px">fsdf</td> </tr> <tr> <td width="150px">fdsf</td> <td width="150px">fsdf</td> </tr> <tr> <td width="150px">fsdf</td> <td width="150px">fasdf</td> </tr> <tr> <td width="150px">fsdf</td> <td width="150px">fsad</td> </tr> </table> </div> </td> </tr> </table> </td> <td width="60%" style="max-width:90%"> <!--canvas--> <table id="table_liuchengtu_html" style="border:1px solid #00FF00"> <!--tab切换的位置--> <tr> <td id="tablist2" style="border:1px solid #FFFF00"> <div class="tab_nonce"><a href="#" onClick="changeTabList2(this)">流程图</a></div> <div class="tab_normal"><a href="#" onClick="changeTabList2(this)">html</a></div> </td> <!--accordiond的位置--> <tr> <td id="td_liuchengtu"> <div id="div_liuchengtu"> <!--拖动放置目标区域--> </div> </td> </tr> </tr> </table> </td> </tr> </table> </div></body></html>Copy after login
用C#思想理解HTML5拖、放:http://www.deepleo.com/archives/1386
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