網上轉貼的太多了，估計原作者的信息也沒了。這裏就沒加了，都是網上抄來的，不是我的原創。
<html> <head> <title>Add Files</title> <style> a.addfile { background-image:url(http://p.mail.163.com/js31style/lib/0703131650/163blue/f1.gif); background-repeat:no-repeat; background-position:-823px -17px; display:block; float:left; height:20px; margin-top:-1px; position:relative; text-decoration:none; top:0pt; width:80px; } input.addfile { /*left:-18px;*/ } input.addfile { cursor:pointer !important; height:18px; left:-13px; filter:alpha(opacity=0); position:absolute; top:5px; width:1px; z-index: -1; } </style> <script type="text/javascript"> function MultiSelector(list_target, max) { // Where to write the list this.list_target = list_target; // How many elements? this.count = 0; // How many elements? this.id = 0; // Is there a maximum? if (max) { this.max = max; } else { this.max = -1; }; /** * Add a new file input element */ this.addElement = function(element) { // Make sure it's a file input element if (element.tagName == 'INPUT' && element.type == 'file') { // Element name -- what number am I? element.name = 'file_' + this.id++; // Add reference to this object element.multi_selector = this; // What to do when a file is selected element.onchange = function() { // New file input var new_element = document.createElement('input'); new_element.type = 'file'; new_element.size = 1; new_element.className = "addfile"; // Add new element this.parentNode.insertBefore(new_element, this); // Apply 'update' to element this.multi_selector.addElement(new_element); // Update list this.multi_selector.addListRow(this); // Hide this: we can't use display:none because Safari doesn't like it this.style.position = 'absolute'; this.style.left = '-1000px'; }; // If we've reached maximum number, disable input element if (this.max != -1 && this.count >= this.max) { element.disabled = true; }; // File element counter this.count++; // Most recent element this.current_element = element; } else { // This can only be applied to file input elements! alert('Error: not a file input element'); }; }; /** * Add a new row to the list of files */ this.addListRow = function(element) { // Row div var new_row = document.createElement('div'); // Delete button var new_row_button = document.createElement('input'); new_row_button.type = 'button'; new_row_button.value = 'Delete'; // References new_row.element = element; // Delete function new_row_button.onclick = function() { // Remove element from form this.parentNode.element.parentNode.removeChild(this.parentNode.element); // Remove this row from the list this.parentNode.parentNode.removeChild(this.parentNode); // Decrement counter this.parentNode.element.multi_selector.count--; // Re-enable input element (if it's disabled) this.parentNode.element.multi_selector.current_element.disabled = false; // Appease Safari // without it Safari wants to reload the browser window // which nixes your already queued uploads return false; }; // Set row value new_row.innerHTML = element.value + " "; // Add button new_row.appendChild(new_row_button); // Add it to the list this.list_target.appendChild(new_row); }; }; </script> </head> <body> <!-- This is the form --> <form enctype="multipart/form-data" action="" method="post"> <!-- The file element -- NOTE: it has an ID --> <a href="javascript:void(1==1);" class="addfile" style="cursor: default;" hidefocus="true"> <input id="my_file_element" class="addfile" type="file" name="file_1" size="1" title="點擊選擇附件"> </a> <input type="submit" value="上 傳"> </form> Files: <!-- This is where the output will appear --> <div id="files_list" style="padding:5px;border:1px;border-style:solid;border-color:#0000ff;height:100px;width:600px;"></div> <script> <!-- Create an instance of the multiSelector class, pass it the output target and the max number of files --> var multi_selector = new MultiSelector(document.getElementById('files_list'), 100); <!-- Pass in the file element --> multi_selector.addElement(document.getElementById('my_file_element')); </script> </body> </html>
