標籤：ems 類型 doc selector one art tar stat request
1)建立來源項目
1.1)draggable屬性的值：
true——此元素能被拖動；
false——此元素不能被拖動；
auto——瀏覽器能夠自主決定某個元素能否被拖動；
1.2）被拖動元素的事件：
dragstart——在元素開始被拖動時觸發；
drag——在元素被拖動時重複觸發。
dragend——在拖動操作完畢時觸發；
2）建立釋放區
2.1）釋放區事件：
dragenter——當被拖動元素進入釋放區所佔領的螢幕空間時觸發；
dragover——當被拖動元素在釋放區內觸發時移動觸發；
dragleave——當被拖動元素沒有放入就離開釋放區時觸發；
drop——當被拖動元素在釋放區放下時觸發。
<!DOCTYPE HTML><html> <head> <title>Example</title> <style> #src > * {float:left;} #src > img {border: thin solid black; padding: 2px; margin:4px;} #target {border: thin solid black; margin:4px;} #target { height: 81px; width: 81px; text-align: center; display: table;} #target > p {display: table-cell; vertical-align: middle;} img.dragged {background-color: lightgrey;} </style> </head> <body> <div id="src"> <img draggable="true" id="banana" src="banana100.png" alt="banana"/> <img draggable="true" id="apple" src="apple100.png" alt="apple"/> <img draggable="true" id="cherries" src="cherries100.png" alt="cherry"/> <div id="target"> <p id="msg">Drop Here</p> </div> </div> <script> var src = document.getElementById("src"); var target = document.getElementById("target"); var msg = document.getElementById("msg"); var draggedID; target.ondragenter = handleDrag; target.ondragover = handleDrag; function handleDrag(e) { e.preventDefault(); } target.ondrop = function(e) { var newElem = document.getElementById(draggedID).cloneNode(false); target.innerHTML = ""; target.appendChild(newElem); e.preventDefault(); } src.ondragstart = function(e) { draggedID = e.target.id; e.target.classList.add("dragged"); } src.ondragend = function(e) { var elems = document.querySelectorAll(".dragged"); for (var i = 0; i < elems.length; i++) { elems[i].classList.remove("dragged"); } } </script> </body></html>3)使用DataTransfer對象
3.1)與拖放操作所觸發的事件同一時候派發的對象是DragEvent，它派生於MouseEvent。
DragEvent對象定義的額外屬性：
dataTransfer——返回用於資料轉送到釋放區的對象（DataTransfer）；
3.2)DataTransfer對象定義的屬性：
types——返回資料的格式。
getData(<format>)——返回指定格式的資料；
setData(<format>,<data>)——設定指定格式的資料。
clearData(<format>)——移除指定格式的資料。
files——返回已被拖動檔案的列表。
<!DOCTYPE HTML><html> <head> <title>Example</title> <style> #src > * {float:left;} #src > img {border: thin solid black; padding: 2px; margin:4px;} #target {border: thin solid black; margin:4px;} #target { height: 81px; width: 81px; text-align: center; display: table;} #target > p {display: table-cell; vertical-align: middle;} img.dragged {background-color: lightgrey;} </style> </head> <body> <div id="src"> <img draggable="true" id="banana" src="banana100.png" alt="banana"/> <img draggable="true" id="apple" src="apple100.png" alt="apple"/> <img draggable="true" id="cherries" src="cherries100.png" alt="cherry"/> <div id="target"> <p id="msg">Drop Here</p> </div> </div> <script> var src = document.getElementById("src"); var target = document.getElementById("target"); target.ondragenter = handleDrag; target.ondragover = handleDrag; function handleDrag(e) { e.preventDefault(); } target.ondrop = function(e) { var droppedID = e.dataTransfer.getData("Text"); var newElem = document.getElementById(droppedID).cloneNode(false); target.innerHTML = ""; target.appendChild(newElem); e.preventDefault(); } src.ondragstart = function(e) { e.dataTransfer.setData("Text", e.target.id); e.target.classList.add("dragged"); } src.ondragend = function(e) { var elems = document.querySelectorAll(".dragged"); for (var i = 0; i < elems.length; i++) { elems[i].classList.remove("dragged"); } } </script> </body></html> 3.3）拖放檔案：
File對象定義的屬性
name——擷取檔案名稱。
type——擷取檔案類型。以MIME類型表示；
size——擷取檔案大小（以位元組計算）；
<!DOCTYPE HTML><html> <head> <title>Example</title> <style> .table {display:table;} .row {display:table-row;} .cell {display: table-cell; padding: 5px;} .label {text-align: right;} #target {border: medium double black; margin:4px; height: 50px; width: 200px; text-align: center; display: table;} #target > p {display: table-cell; vertical-align: middle;} </style> </head> <body> <form id="fruitform" method="post" action="http://titan:8080/form"> <div class="table"> <div class="row"> <div class="cell label">Bananas:</div> <div class="cell"><input name="bananas" value="2"/></div> </div> <div class="row"> <div class="cell label">Apples:</div> <div class="cell"><input name="apples" value="5"/></div> </div> <div class="row"> <div class="cell label">Cherries:</div> <div class="cell"><input name="cherries" value="20"/></div> </div> <div class="row"> <div class="cell label">File:</div> <div class="cell"><input type="file" name="file"/></div> </div> <div class="row"> <div class="cell label">Total:</div> <div id="results" class="cell">0 items</div> </div> </div> <div id="target"> <p id="msg">Drop Files Here</p> </div> <button id="submit" type="submit">Submit Form</button> </form> <script> var target = document.getElementById("target"); var httpRequest; var fileList; document.getElementById("submit").onclick = handleButtonPress; target.ondragenter = handleDrag; target.ondragover = handleDrag; function handleDrag(e) { e.preventDefault(); } target.ondrop = function(e) { fileList = e.dataTransfer.files; e.preventDefault(); } function handleButtonPress(e) { e.preventDefault(); var form = document.getElementById("fruitform"); var formData = new FormData(form); if (fileList || true) { for (var i = 0; i < fileList.length; i++) { formData.append("file" + i, fileList[i]); } } httpRequest = new XMLHttpRequest(); httpRequest.onreadystatechange = handleResponse; httpRequest.open("POST", form.action); httpRequest.send(formData); } function handleResponse() { if (httpRequest.readyState == 4 && httpRequest.status == 200) { var data = JSON.parse(httpRequest.responseText); document.getElementById("results").innerHTML = "You ordered " + data.total + " items"; } } </script> </body></html>
html5之拖放
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