Heim >Web-Frontend >js-Tutorial >Codebeispiel für das Hochladen von Dateien über AjaxUpLoad.js (ausführliches Tutorial)

Codebeispiel für das Hochladen von Dateien über AjaxUpLoad.js (ausführliches Tutorial)

亚连
亚连Original
2018-06-01 14:53:451472Durchsuche

这篇文章主要为大家详细介绍了AjaxUpLoad.js实现文件上传的具体代码,具有一定的参考价值,感兴趣的小伙伴们可以参考一下

AjaxUpload.js文件的代码,供大家参考,具体内容如下

/** 
 * AJAX Upload ( http://valums.com/ajax-upload/ ) 
 * Copyright (c) Andris Valums 
 * Licensed under the MIT license ( http://valums.com/mit-license/ ) 
 * Thanks to Gary Haran, David Mark, Corey Burns and others for contributions 
 */ 
(function () { 
 /* global window */ 
 /* jslint browser: true, devel: true, undef: true, nomen: true, bitwise: true, regexp: true, newcap: true, immed: true */ 
 
 /** 
  * Wrapper for FireBug's console.log 
  */ 
 
 function log() { 
  if (typeof(console) != 'undefined' && typeof(console.log) == 'function') { 
   Array.prototype.unshift.call(arguments, '[Ajax Upload]'); 
   console.log(Array.prototype.join.call(arguments, ' ')); 
  } 
 } 
 
 /** 
  * Attaches event to a dom element. 
  * @param {Element} el 
  * @param type event name 
  * @param fn callback This refers to the passed element 
  */ 
 
 function addEvent(el, type, fn) { 
  if (el.addEventListener) { 
   el.addEventListener(type, fn, false); 
  } else if (el.attachEvent) { 
   el.attachEvent('on' + type, function () { 
    fn.call(el); 
   }); 
  } else { 
   throw new Error('not supported or DOM not loaded'); 
  } 
 } 
 
 /** 
  * Attaches resize event to a window, limiting 
  * number of event fired. Fires only when encounteres 
  * delay of 100 after series of events. 
  * 
  * Some browsers fire event multiple times when resizing 
  * http://www.quirksmode.org/dom/events/resize.html 
  * 
  * @param fn callback This refers to the passed element 
  */ 
 
 function addResizeEvent(fn) { 
  var timeout; 
 
  addEvent(window, 'resize', function () { 
   if (timeout) { 
    clearTimeout(timeout); 
   } 
   timeout = setTimeout(fn, 100); 
  }); 
 } 
 
 // Needs more testing, will be rewriten for next version   
 // getOffset function copied from jQuery lib (http://jquery.com/) 
 if (document.documentElement.getBoundingClientRect) { 
  // Get Offset using getBoundingClientRect 
  // http://ejohn.org/blog/getboundingclientrect-is-awesome/ 
  var getOffset = function (el) { 
   var box = el.getBoundingClientRect(); 
   var doc = el.ownerDocument; 
   var body = doc.body; 
   var docElem = doc.documentElement; // for ie 
   var clientTop = docElem.clientTop || body.clientTop || 0; 
   var clientLeft = docElem.clientLeft || body.clientLeft || 0; 
 
   // In Internet Explorer 7 getBoundingClientRect property is treated as physical, 
   // while others are logical. Make all logical, like in IE8. 
   var zoom = 1; 
   if (body.getBoundingClientRect) { 
    var bound = body.getBoundingClientRect(); 
    zoom = (bound.right - bound.left) / body.clientWidth; 
   } 
 
   if (zoom > 1) { 
    clientTop = 0; 
    clientLeft = 0; 
   } 
 
   var top = box.top / zoom + (window.pageYOffset || docElem && docElem.scrollTop / zoom || body.scrollTop / zoom) - clientTop, 
    left = box.left / zoom + (window.pageXOffset || docElem && docElem.scrollLeft / zoom || body.scrollLeft / zoom) - clientLeft; 
 
   return { 
    top: top, 
    left: left 
   }; 
  }; 
 } else { 
  // Get offset adding all offsets 
  var getOffset = function (el) { 
   var top = 0, 
    left = 0; 
   do { 
    top += el.offsetTop || 0; 
    left += el.offsetLeft || 0; 
    el = el.offsetParent; 
   } while (el); 
 
   return { 
    left: left, 
    top: top 
   }; 
  }; 
 } 
 
 /** 
  * Returns left, top, right and bottom properties describing the border-box, 
  * in pixels, with the top-left relative to the body 
  * @param {Element} el 
  * @return {Object} Contains left, top, right,bottom 
  */ 
 
 function getBox(el) { 
  var left, right, top, bottom; 
  var offset = getOffset(el); 
  left = offset.left; 
  top = offset.top; 
 
  right = left + el.offsetWidth; 
  bottom = top + el.offsetHeight; 
 
  return { 
   left: left, 
   right: right, 
   top: top, 
   bottom: bottom 
  }; 
 } 
 
 /** 
  * Helper that takes object literal 
  * and add all properties to element.style 
  * @param {Element} el 
  * @param {Object} styles 
  */ 
 
 function addStyles(el, styles) { 
  for (var name in styles) { 
   if (styles.hasOwnProperty(name)) { 
    el.style[name] = styles[name]; 
   } 
  } 
 } 
 
 /** 
  * Function places an absolutely positioned 
  * element on top of the specified element 
  * copying position and dimentions. 
  * @param {Element} from 
  * @param {Element} to 
  */ 
 
 function copyLayout(from, to) { 
  var box = getBox(from); 
 
  addStyles(to, { 
   position: 'absolute', 
   left: box.left + 'px', 
   top: box.top + 'px', 
   width: from.offsetWidth + 'px', 
   height: from.offsetHeight + 'px' 
  }); 
 } 
 
 /** 
  * Creates and returns element from html chunk 
  * Uses innerHTML to create an element 
  */ 
 var toElement = (function () { 
  var p = document.createElement('p'); 
  return function (html) { 
   p.innerHTML = html; 
   var el = p.firstChild; 
   return p.removeChild(el); 
  }; 
 })(); 
 
 /** 
  * Function generates unique id 
  * @return unique id 
  */ 
 var getUID = (function () { 
  var id = 0; 
  return function () { 
   return 'ValumsAjaxUpload' + id++; 
  }; 
 })(); 
 
 /** 
  * Get file name from path 
  * @param {String} file path to file 
  * @return filename 
  */ 
 
 function fileFromPath(file) { 
  return file.replace(/.*(\/|\\)/, ""); 
 } 
 
 /** 
  * Get file extension lowercase 
  * @param {String} file name 
  * @return file extenstion 
  */ 
 
 function getExt(file) { 
  return (-1 !== file.indexOf('.')) ? file.replace(/.*[.]/, '') : ''; 
 } 
 
 function hasClass(el, name) { 
  var re = new RegExp('\\b' + name + '\\b'); 
  return re.test(el.className); 
 } 
 
 function addClass(el, name) { 
  if (!hasClass(el, name)) { 
   el.className += ' ' + name; 
  } 
 } 
 
 function removeClass(el, name) { 
  var re = new RegExp('\\b' + name + '\\b'); 
  el.className = el.className.replace(re, ''); 
 } 
 
 function removeNode(el) { 
  el.parentNode.removeChild(el); 
 } 
 
 /** 
  * Easy styling and uploading 
  * @constructor 
  * @param button An element you want convert to 
  * upload button. Tested dimentions up to 500x500px 
  * @param {Object} options See defaults below. 
  */ 
 window.AjaxUpload = function (button, options) { 
  this._settings = { 
   // Location of the server-side upload script 
   action: 'upload.php', 
   // File upload name 
   name: 'userfile', 
   // Additional data to send 
   data: {}, 
   // Submit file as soon as it's selected 
   autoSubmit: true, 
   // The type of data that you're expecting back from the server. 
   // html and xml are detected automatically. 
   // Only useful when you are using json data as a response. 
   // Set to "json" in that case. 
   responseType: false, 
   // Class applied to button when mouse is hovered 
   hoverClass: 'hover', 
   // Class applied to button when AU is disabled 
   disabledClass: 'disabled', 
   // When user selects a file, useful with autoSubmit disabled 
   // You can return false to cancel upload    
   onChange: function (file, extension) {}, 
   // Callback to fire before file is uploaded 
   // You can return false to cancel upload 
   onSubmit: function (file, extension) {}, 
   // Fired when file upload is completed 
   // WARNING! DO NOT USE "FALSE" STRING AS A RESPONSE! 
   onComplete: function (file, response) {} 
  }; 
 
  // Merge the users options with our defaults 
  for (var i in options) { 
   if (options.hasOwnProperty(i)) { 
    this._settings[i] = options[i]; 
   } 
  } 
 
  // button isn't necessary a dom element 
  if (button.jquery) { 
   // jQuery object was passed 
   button = button[0]; 
  } else if (typeof button == "string") { 
   if (/^#.*/.test(button)) { 
    // If jQuery user passes #elementId don't break it     
    button = button.slice(1); 
   } 
 
   button = document.getElementById(button); 
  } 
 
  if (!button || button.nodeType !== 1) { 
   throw new Error("Please make sure that you're passing a valid element"); 
  } 
 
  if (button.nodeName.toUpperCase() == 'A') { 
   // disable link       
   addEvent(button, 'click', function (e) { 
    if (e && e.preventDefault) { 
     e.preventDefault(); 
    } else if (window.event) { 
     window.event.returnValue = false; 
    } 
   }); 
  } 
 
  // DOM element 
  this._button = button; 
  // DOM element     
  this._input = null; 
  // If disabled clicking on button won't do anything 
  this._disabled = false; 
 
  // if the button was disabled before refresh if will remain 
  // disabled in FireFox, let's fix it 
  this.enable(); 
 
  this._rerouteClicks(); 
 }; 
 
 // assigning methods to our class 
 AjaxUpload.prototype = { 
  setData: function (data) { 
   this._settings.data = data; 
  }, 
  disable: function () { 
   addClass(this._button, this._settings.disabledClass); 
   this._disabled = true; 
 
   var nodeName = this._button.nodeName.toUpperCase(); 
   if (nodeName == 'INPUT' || nodeName == 'BUTTON') { 
    this._button.setAttribute('disabled', 'disabled'); 
   } 
 
   // hide input 
   if (this._input) { 
    // We use visibility instead of display to fix problem with Safari 4 
    // The problem is that the value of input doesn't change if it 
    // has display none when user selects a file    
    this._input.parentNode.style.visibility = 'hidden'; 
   } 
  }, 
  enable: function () { 
   removeClass(this._button, this._settings.disabledClass); 
   this._button.removeAttribute('disabled'); 
   this._disabled = false; 
 
  }, 
  /** 
   * Creates invisible file input 
   * that will hover above the button 
   * <p><input type=&#39;file&#39; /></p> 
   */ 
  _createInput: function () { 
   var self = this; 
 
   var input = document.createElement("input"); 
   input.setAttribute(&#39;type&#39;, &#39;file&#39;); 
   input.setAttribute(&#39;name&#39;, this._settings.name); 
 
   addStyles(input, { 
    &#39;position&#39;: &#39;absolute&#39;, 
    // in Opera only &#39;browse&#39; button 
    // is clickable and it is located at 
    // the right side of the input 
    &#39;right&#39;: 0, 
    &#39;margin&#39;: 0, 
    &#39;padding&#39;: 0, 
    &#39;fontSize&#39;: &#39;480px&#39;, 
    &#39;cursor&#39;: &#39;pointer&#39; 
   }); 
 
   var p = document.createElement("p"); 
   addStyles(p, { 
    &#39;display&#39;: &#39;block&#39;, 
    &#39;position&#39;: &#39;absolute&#39;, 
    &#39;overflow&#39;: &#39;hidden&#39;, 
    &#39;margin&#39;: 0, 
    &#39;padding&#39;: 0, 
    &#39;opacity&#39;: 0, 
    // Make sure browse button is in the right side 
    // in Internet Explorer 
    &#39;direction&#39;: &#39;ltr&#39;, 
    //Max zIndex supported by Opera 9.0-9.2 
    &#39;zIndex&#39;: 2147483583 
   }); 
 
   // Make sure that element opacity exists. 
   // Otherwise use IE filter    
   if (p.style.opacity !== "0") { 
    if (typeof(p.filters) == &#39;undefined&#39;) { 
     throw new Error(&#39;Opacity not supported by the browser&#39;); 
    } 
    p.style.filter = "alpha(opacity=0)"; 
   } 
 
   addEvent(input, &#39;change&#39;, function () { 
 
    if (!input || input.value === &#39;&#39;) { 
     return; 
    } 
 
    // Get filename from input, required     
    // as some browsers have path instead of it   
    var file = fileFromPath(input.value); 
 
    if (false === self._settings.onChange.call(self, file, getExt(file))) { 
     self._clearInput(); 
     return; 
    } 
 
    // Submit form when value is changed 
    if (self._settings.autoSubmit) { 
     self.submit(); 
    } 
   }); 
 
   addEvent(input, &#39;mouseover&#39;, function () { 
    addClass(self._button, self._settings.hoverClass); 
   }); 
 
   addEvent(input, &#39;mouseout&#39;, function () { 
    removeClass(self._button, self._settings.hoverClass); 
 
    // We use visibility instead of display to fix problem with Safari 4 
    // The problem is that the value of input doesn&#39;t change if it 
    // has display none when user selects a file    
    input.parentNode.style.visibility = &#39;hidden&#39;; 
 
   }); 
 
   p.appendChild(input); 
   document.body.appendChild(p); 
 
   this._input = input; 
  }, 
  _clearInput: function () { 
   if (!this._input) { 
    return; 
   } 
 
   // this._input.value = &#39;&#39;; Doesn&#39;t work in IE6         
   removeNode(this._input.parentNode); 
   this._input = null; 
   this._createInput(); 
 
   removeClass(this._button, this._settings.hoverClass); 
  }, 
  /** 
   * Function makes sure that when user clicks upload button, 
   * the this._input is clicked instead 
   */ 
  _rerouteClicks: function () { 
   var self = this; 
 
   // IE will later display &#39;access denied&#39; error 
   // if you use using self._input.click() 
   // other browsers just ignore click() 
 
   addEvent(self._button, &#39;mouseover&#39;, function () { 
    if (self._disabled) { 
     return; 
    } 
 
    if (!self._input) { 
     self._createInput(); 
    } 
 
    var p = self._input.parentNode; 
    copyLayout(self._button, p); 
    p.style.visibility = &#39;visible&#39;; 
 
   }); 
 
 
   // commented because we now hide input on mouseleave 
   /** 
    * When the window is resized the elements 
    * can be misaligned if button position depends 
    * on window size 
    */ 
   //addResizeEvent(function(){ 
   // if (self._input){ 
   //  copyLayout(self._button, self._input.parentNode); 
   // } 
   //});    
 
  }, 
  /** 
   * Creates iframe with unique name 
   * @return {Element} iframe 
   */ 
  _createIframe: function () { 
   // We can&#39;t use getTime, because it sometimes return 
   // same value in safari :( 
   var id = getUID(); 
 
   // We can&#39;t use following code as the name attribute 
   // won&#39;t be properly registered in IE6, and new window 
   // on form submit will open 
   // var iframe = document.createElement(&#39;iframe&#39;); 
   // iframe.setAttribute(&#39;name&#39;, id);       
 
   var iframe = toElement(&#39;<iframe src="javascript:false;" name="&#39; + id + &#39;" />&#39;); 
   // src="javascript:false; was added 
   // because it possibly removes ie6 prompt 
   // "This page contains both secure and nonsecure items" 
   // Anyway, it doesn&#39;t do any harm.    
   iframe.setAttribute(&#39;id&#39;, id); 
 
   iframe.style.display = &#39;none&#39;; 
   document.body.appendChild(iframe); 
 
   return iframe; 
  }, 
  /** 
   * Creates form, that will be submitted to iframe 
   * @param {Element} iframe Where to submit 
   * @return {Element} form 
   */ 
  _createForm: function (iframe) { 
   var settings = this._settings; 
 
   // We can&#39;t use the following code in IE6 
   // var form = document.createElement(&#39;form&#39;); 
   // form.setAttribute(&#39;method&#39;, &#39;post&#39;); 
   // form.setAttribute(&#39;enctype&#39;, &#39;multipart/form-data&#39;); 
   // Because in this case file won&#39;t be attached to request      
   var form = toElement(&#39;<form method="post" enctype="multipart/form-data"></form>&#39;); 
 
   form.setAttribute(&#39;action&#39;, settings.action); 
   form.setAttribute(&#39;target&#39;, iframe.name); 
   form.style.display = &#39;none&#39;; 
   document.body.appendChild(form); 
 
   // Create hidden input element for each data key 
   for (var prop in settings.data) { 
    if (settings.data.hasOwnProperty(prop)) { 
     var el = document.createElement("input"); 
     el.setAttribute(&#39;type&#39;, &#39;hidden&#39;); 
     el.setAttribute(&#39;name&#39;, prop); 
     el.setAttribute(&#39;value&#39;, settings.data[prop]); 
     form.appendChild(el); 
    } 
   } 
   return form; 
  }, 
  /** 
   * Gets response from iframe and fires onComplete event when ready 
   * @param iframe 
   * @param file Filename to use in onComplete callback 
   */ 
  _getResponse: function (iframe, file) { 
   // getting response 
   var toDeleteFlag = false, 
    self = this, 
    settings = this._settings; 
 
   addEvent(iframe, &#39;load&#39;, function () { 
 
    if ( // For Safari 
    iframe.src == "javascript:&#39;%3Chtml%3E%3C/html%3E&#39;;" || 
    // For FF, IE 
    iframe.src == "javascript:&#39;<html></html>&#39;;") { 
     // First time around, do not delete. 
     // We reload to blank page, so that reloading main page 
     // does not re-submit the post. 
 
     if (toDeleteFlag) { 
      // Fix busy state in FF3 
      setTimeout(function () { 
       removeNode(iframe); 
      }, 
      0); 
     } 
 
     return; 
    } 
 
    var doc = iframe.contentDocument ? iframe.contentDocument : window.frames[iframe.id].document; 
 
    // fixing Opera 9.26,10.00 
    if (doc.readyState && doc.readyState != &#39;complete&#39;) { 
     // Opera fires load event multiple times 
     // Even when the DOM is not ready yet 
     // this fix should not affect other browsers 
     return; 
    } 
 
    // fixing Opera 9.64 
    if (doc.body && doc.body.innerHTML == "false") { 
     // In Opera 9.64 event was fired second time 
     // when body.innerHTML changed from false 
     // to server response approx. after 1 sec 
     return; 
    } 
 
    var response; 
 
    if (doc.XMLDocument) { 
     // response is a xml document Internet Explorer property 
     response = doc.XMLDocument; 
    } else if (doc.body) { 
     // response is html document or plain text 
     response = doc.body.innerHTML; 
 
     if (settings.responseType && settings.responseType.toLowerCase() == &#39;json&#39;) { 
      // If the document was sent as &#39;application/javascript&#39; or 
      // &#39;text/javascript&#39;, then the browser wraps the text in a <pre class="brush:php;toolbar:false"> 
      // tag and performs html encoding on the contents. In this case, 
      // we need to pull the original text content from the text node&#39;s 
      // nodeValue property to retrieve the unmangled content. 
      // Note that IE6 only understands text/html 
      if (doc.body.firstChild && doc.body.firstChild.nodeName.toUpperCase() == &#39;PRE&#39;) { 
       response = doc.body.firstChild.firstChild.nodeValue; 
      } 
 
      if (response) { 
       response = eval("(" + response + ")"); 
      } else { 
       response = {}; 
      } 
     } 
    } else { 
     // response is a xml document 
     response = doc; 
    } 
 
    settings.onComplete.call(self, file, response); 
 
    // Reload blank page, so that reloading main page 
    // does not re-submit the post. Also, remember to 
    // delete the frame 
    toDeleteFlag = true; 
 
    // Fix IE mixed content issue 
    iframe.src = "javascript:&#39;<html></html>&#39;;"; 
   }); 
  }, 
  /** 
   * Upload file contained in this._input 
   */ 
  submit: function () { 
   var self = this, 
    settings = this._settings; 
 
   if (!this._input || this._input.value === &#39;&#39;) { 
    return; 
   } 
 
   var file = fileFromPath(this._input.value); 
 
   // user returned false to cancel upload 
   if (false === settings.onSubmit.call(this, file, getExt(file))) { 
    this._clearInput(); 
    return; 
   } 
 
   // sending request  
   var iframe = this._createIframe(); 
   var form = this._createForm(iframe); 
 
   // assuming following structure 
   // p -> input type=&#39;file&#39; 
   removeNode(this._input.parentNode); 
   removeClass(self._button, self._settings.hoverClass); 
 
   form.appendChild(this._input); 
 
   form.submit(); 
 
   // request set, clean up     
   removeNode(form); 
   form = null; 
   removeNode(this._input); 
   this._input = null; 
 
   // Get response from iframe and fire onComplete event when ready 
   this._getResponse(iframe, file); 
 
   // get ready for next request    
   this._createInput(); 
  } 
 }; 
})();

上面是我整理给大家的,希望今后会对大家有帮助。

相关文章:

js构建二叉树进行数值数组的去重与优化详解

详解Vue 全局引入bass.scss 处理方案

使用node打造自己的命令行工具方法教程

Das obige ist der detaillierte Inhalt vonCodebeispiel für das Hochladen von Dateien über AjaxUpLoad.js (ausführliches Tutorial). Für weitere Informationen folgen Sie bitte anderen verwandten Artikeln auf der PHP chinesischen Website!

Stellungnahme:
Der Inhalt dieses Artikels wird freiwillig von Internetnutzern beigesteuert und das Urheberrecht liegt beim ursprünglichen Autor. Diese Website übernimmt keine entsprechende rechtliche Verantwortung. Wenn Sie Inhalte finden, bei denen der Verdacht eines Plagiats oder einer Rechtsverletzung besteht, wenden Sie sich bitte an admin@php.cn