util.js.svn-base

prototype 实现网络相册的ajax界面。

// Copyright (c) 2005 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
//
// See scriptaculous.js for full license.

Object.inspect = function(obj) {
  var info = [];
  
  if(typeof obj in ["string","number"]) {
    return obj;
  } else {
    for(property in obj)
      if(typeof obj[property]!="function")
        info.push(property + ' => ' + 
          (typeof obj[property] == "string" ?
            '"' + obj[property] + '"' :
            obj[property]));
  }
  
  return ("'" + obj + "' #" + typeof obj + 
    ": {" + info.join(", ") + "}");
}

// borrowed from http://www.schuerig.de/michael/javascript/stdext.js
// Copyright (c) 2005, Michael Schuerig, [e-mail]

Array.flatten = function(array, excludeUndefined) {
  if (excludeUndefined === undefined) {
    excludeUndefined = false;
  }
  var result = [];
  var len = array.length;
  for (var i = 0; i < len; i++) {
    var el = array[i];
    if (el instanceof Array) {
      var flat = el.flatten(excludeUndefined);
      result = result.concat(flat);
    } else if (!excludeUndefined || el != undefined) {
      result.push(el);
    }
  }
  return result;
};

if (!Array.prototype.flatten) {
  Array.prototype.flatten = function(excludeUndefined) {
    return Array.flatten(this, excludeUndefined);
  }
}

String.prototype.toArray = function() {
  var results = [];
  for (var i = 0; i < this.length; i++)
    results.push(this.charAt(i));
  return results;
}

/*--------------------------------------------------------------------------*/

var Builder = {
  node: function(elementName) {
    var element = document.createElement('div');
    element.innerHTML = 
      "<" + elementName + "></" + elementName + ">";

    // attributes (or text)
    if(arguments[1])
      if(this._isStringOrNumber(arguments[1]) ||
        (arguments[1] instanceof Array)) {
          this._children(element.firstChild, arguments[1]);
        } else {
          var attrs = this._attributes(arguments[1]);
          if(attrs.length) 
            element.innerHTML = "<" +elementName + " " +
              attrs + "></" + elementName + ">";
        } 

    // text, or array of children
    if(arguments[2])
      this._children(element.firstChild, arguments[2]);

     return element.firstChild;
  },
  _text: function(text) {
     return document.createTextNode(text);
  },
  _attributes: function(attributes) {
    var attrs = [];
    for(attribute in attributes)
      attrs.push((attribute=='className' ? 'class' : attribute) +
          '="' + attributes[attribute].toString().escapeHTML() + '"');
    return attrs.join(" ");
  },
  _children: function(element, children) {
    if(typeof children=='object') { // array can hold nodes and text
      children.flatten().each( function(e) {
        if(typeof e=='object')
          element.appendChild(e)
        else
          if(Builder._isStringOrNumber(e))
            element.appendChild(Builder._text(e));
      });
    } else
      if(Builder._isStringOrNumber(children)) 
         element.appendChild(Builder._text(children));
  },
  _isStringOrNumber: function(param) {
    return(typeof param=='string' || typeof param=='number');
  }
}

/* ------------- element ext -------------- */

// adapted from http://dhtmlkitchen.com/learn/js/setstyle/index4.jsp
// note: Safari return null on elements with display:none; see http://bugzilla.opendarwin.org/show_bug.cgi?id=4125
// instead of "auto" values returns null so it's easier to use with || constructs

String.prototype.camelize = function() {
  var oStringList = this.split('-');
  if(oStringList.length == 1)    
    return oStringList[0];
  var ret = this.indexOf("-") == 0 ? 
    oStringList[0].charAt(0).toUpperCase() + oStringList[0].substring(1) : oStringList[0];
  for(var i = 1, len = oStringList.length; i < len; i++){
    var s = oStringList[i];
    ret += s.charAt(0).toUpperCase() + s.substring(1)
  }
  return ret;
}

Element.getStyle = function(element, style) {
  element = $(element);
  var value = element.style[style.camelize()];
  if(!value)
    if(document.defaultView && document.defaultView.getComputedStyle) {
      var css = document.defaultView.getComputedStyle(element, null);
      value = (css!=null) ? css.getPropertyValue(style) : null;
    } else if(element.currentStyle) {
      value = element.currentStyle[style.camelize()];
    }
  
  // If top, left, bottom, or right values have been queried, return "auto" for consistency resaons 
  // if position is "static", as Opera (and others?) returns the pixel values relative to root element 
  // (or positioning context?)
  if (window.opera && (style == "left" || style == "top" || style == "right" || style == "bottom"))
    if (Element.getStyle(element, "position") == "static") value = "auto";
    
  if(value=='auto') value = null;
  return value;
}

// converts rgb() and #xxx to #xxxxxx format,
// returns self (or first argument) if not convertable
String.prototype.parseColor = function() {
  color = "#";
  if(this.slice(0,4) == "rgb(") {
    var cols = this.slice(4,this.length-1).split(',');
    var i=0; do { color += parseInt(cols[i]).toColorPart() } while (++i<3);
  } else {
    if(this.slice(0,1) == '#') {
      if(this.length==4) for(var i=1;i<4;i++) color += (this.charAt(i) + this.charAt(i)).toLowerCase();
      if(this.length==7) color = this.toLowerCase();
    }
  }
  return(color.length==7 ? color : (arguments[0] || this));
}

Element.makePositioned = function(element) {
  element = $(element);
  var pos = Element.getStyle(element, 'position');
  if(pos =='static' || !pos) {
    element._madePositioned = true;
    element.style.position = "relative";
    // Opera returns the offset relative to the positioning context, when an element is position relative 
    // but top and left have not been defined
    if (window.opera){
      element.style.top = 0;
      element.style.left = 0;
    }  
  }
}
  
Element.undoPositioned = function(element) {
  element = $(element);
  if(typeof element._madePositioned != "undefined"){
    element._madePositioned = undefined;
    element.style.position = "";
    element.style.top = "";
    element.style.left = "";
    element.style.bottom = "";
    element.style.right = "";	  
  }
}

Element.makeClipping = function(element) {
  element = $(element);
  if (typeof element._overflow != 'undefined') return;
  element._overflow = element.style.overflow;
  if((Element.getStyle(element, 'overflow') || 'visible') != 'hidden') element.style.overflow = 'hidden';
}

Element.undoClipping = function(element) {
  element = $(element);
  if (typeof element._overflow == 'undefined') return;
  element.style.overflow = element._overflow;
  element._overflow = undefined;
}

Element.collectTextNodesIgnoreClass = function(element, ignoreclass) {
  var children = $(element).childNodes;
  var text     = "";
  var classtest = new RegExp("^([^ ]+ )*" + ignoreclass+ "( [^ ]+)*$","i");

  for (var i = 0; i < children.length; i++) {
    if(children[i].nodeType==3) {
      text+=children[i].nodeValue;
    } else {
      if((!children[i].className.match(classtest)) && children[i].hasChildNodes())
        text += Element.collectTextNodesIgnoreClass(children[i], ignoreclass);
    }
  }

  return text;
}

Element.setContentZoom = function(element, percent) {
  element = $(element);
  element.style.fontSize = (percent/100) + "em";  
  if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0);
}

Element.getOpacity = function(element){
  return parseFloat(Element.getStyle(element, "opacity") || '1');
}

Element.setOpacity = function(element, value){
  element= $(element);
  var els = element.style;
  if (value == 1){
    els.opacity = '0.999999';
    els.filter  = null;
  } else {
    if(value < 0.00001) value = 0;
    els.opacity = value;
    els.filter  = "alpha(opacity:"+value*100+")";
  }  
}

Element.getInlineOpacity = function(element){
  element= $(element);
  var op;
  op = element.style.opacity;
  if (typeof op != "undefined" && op != "") return op;
  return "";
}

Element.setInlineOpacity = function(element, value){
  element= $(element);
  var els = element.style;
  els.opacity = value;
}