util-js.js

一个简单的java邮件系统源码

        ele.options[i].selected = true;
      }
    }
  }
  // If that fails then try searching through the visible text
  if (found) return;

  for (i = 0; i < ele.options.length; i++) {
    for (j = 0; j < val.length; j++) {
      if (ele.options[i].text == val[j]) {
        ele.options[i].selected = true;
      }
    }
  }
};

/**
 * @private Find an item in a select list and select it. Used by setValue()
 * @param ele The select list item
 * @param val The value to select
 */
DWRUtil._selectListItem = function(ele, val) {
  // We deal with select list elements by selecting the matching option
  // Begin by searching through the values
  var found  = false;
  var i;
  for (i = 0; i < ele.options.length; i++) {
    if (ele.options[i].value == val) {
      ele.options[i].selected = true;
      found = true;
    }
    else {
      ele.options[i].selected = false;
    }
  }

  // If that fails then try searching through the visible text
  if (found) return;

  for (i = 0; i < ele.options.length; i++) {
    if (ele.options[i].text == val) {
      ele.options[i].selected = true;
    }
    else {
      ele.options[i].selected = false;
    }
  }
};

/**
 * Read the current value for a given HTML element.
 * @see http://getahead.ltd.uk/dwr/browser/util/getvalue
 */
DWRUtil.getValue = function(ele, options) {
  if (options == null) {
    options = {};
  }
  var orig = ele;
  ele = $(ele);
  // We can work with names and need to sometimes for radio buttons, and IE has
  // an annoying bug where
  var nodes = document.getElementsByName(orig);
  if (ele == null && nodes.length >= 1) {
    ele = nodes.item(0);
  }
  if (ele == null) {
    DWRUtil.debug("getValue() can't find an element with id/name: " + orig + ".");
    return "";
  }

  if (DWRUtil._isHTMLElement(ele, "select")) {
    // This is a bit of a scam because it assumes single select
    // but I'm not sure how we should treat multi-select.
    var sel = ele.selectedIndex;
    if (sel != -1) {
      var reply = ele.options[sel].value;
      if (reply == null || reply == "") {
        reply = ele.options[sel].text;
      }

      return reply;
    }
    else {
      return "";
    }
  }

  if (DWRUtil._isHTMLElement(ele, "input")) {
    if (ele.type == "radio") {
      var node;
      for (i = 0; i < nodes.length; i++) {
        node = nodes.item(i);
        if (node.type == "radio") {
          if (node.checked) {
            if (nodes.length > 1) return node.value;
            else return true;
          }
        }
      }
    }
    switch (ele.type) {
    case "checkbox":
    case "check-box":
    case "radio":
      // if (ele.checked && ele.value != "") return ele.value;
      // else
      return ele.checked;
    default:
      return ele.value;
    }
  }

  if (DWRUtil._isHTMLElement(ele, "textarea")) {
    return ele.value;
  }

  if (options.textContent) {
    if (ele.textContent) return ele.textContent;
    else if (ele.innerText) return ele.innerText;
  }
  return ele.innerHTML;
};

/**
 * getText() is like getValue() except that it reads the text (and not the value) from select elements
 * @see http://getahead.ltd.uk/dwr/browser/util/gettext
 */
DWRUtil.getText = function(ele) {
  ele = DWRUtil._getElementById(ele, "getText()");
  if (ele == null) return;
  if (!DWRUtil._isHTMLElement(ele, "select")) {
    DWRUtil.debug("getText() can only be used with select elements. Attempt to use: " + DWRUtil._detailedTypeOf(ele) + " from  id: " + orig + ".");
    return "";
  }

  // This is a bit of a scam because it assumes single select
  // but I'm not sure how we should treat multi-select.
  var sel = ele.selectedIndex;
  if (sel != -1) {
    return ele.options[sel].text;
  }
  else {
    return "";
  }
};

/**
 * Given a map, call setValue() for all the entries in the map using the entry key as an element id
 * @see http://getahead.ltd.uk/dwr/browser/util/setvalues
 */
DWRUtil.setValues = function(map) {
  for (var property in map) {
    // Are there any elements with that id or name
    if ($(property) != null || document.getElementsByName(property).length >= 1) {
      DWRUtil.setValue(property, map[property]);
    }
  }
};

/**
 * Given a map, call getValue() for all the entries in the map using the entry key as an element id.
 * Given a string or element that refers to a form, create an object from the elements of the form.
 * @see http://getahead.ltd.uk/dwr/browser/util/getvalues
 */
DWRUtil.getValues = function(data) {
  var ele;
  if (typeof data == "string") ele = $(data);
  if (DWRUtil._isHTMLElement(data)) ele = data;
  if (ele != null) {
    if (ele.elements == null) {
      alert("getValues() requires an object or reference to a form element.");
      return null;
    }
    var reply = {};
    var value;
    for (var i = 0; i < ele.elements.length; i++) {
      if (ele[i].id != null) value = ele[i].id;
      else if (ele[i].value != null) value = ele[i].value;
      else value = "element" + i;
      reply[value] = DWRUtil.getValue(ele[i]);
    }
    return reply;
  }
  else {
    for (var property in data) {
      // Are there any elements with that id or name
      if ($(property) != null || document.getElementsByName(property).length >= 1) {
        data[property] = DWRUtil.getValue(property);
      }
    }
    return data;
  }
};

/**
 * Add options to a list from an array or map.
 * @see http://getahead.ltd.uk/dwr/browser/lists
 */
DWRUtil.addOptions = function(ele, data) {
  ele = DWRUtil._getElementById(ele, "addOptions()");
  if (ele == null) return;
  var useOptions = DWRUtil._isHTMLElement(ele, "select");
  var useLi = DWRUtil._isHTMLElement(ele, ["ul", "ol"]);
  if (!useOptions && !useLi) {
    DWRUtil.debug("addOptions() can only be used with select/ul/ol elements. Attempt to use: " + DWRUtil._detailedTypeOf(ele));
    return;
  }
  if (data == null) return;

  var text;
  var value;
  var li;
  if (DWRUtil._isArray(data)) {
    // Loop through the data that we do have
    for (var i = 0; i < data.length; i++) {
      if (useOptions) {
        if (arguments[2] != null) {
          if (arguments[3] != null) {
            text = DWRUtil._getValueFrom(data[i], arguments[3]);
            value = DWRUtil._getValueFrom(data[i], arguments[2]);
          }
          else {
            value = DWRUtil._getValueFrom(data[i], arguments[2]);
            text = value;
          }
        }
        else
        {
          text = DWRUtil._getValueFrom(data[i], arguments[3]);
          value = text;
        }
        if (text || value) {
          ele.options[ele.options.length] = new Option(text, value);
        }
      }
      else {
        li = document.createElement("li");
        value = DWRUtil._getValueFrom(data[i], arguments[2]);
        if (value != null) {
          li.innerHTML = value;
          ele.appendChild(li);
        }
      }
    }
  }
  else if (arguments[3] != null) {
    if (!useOptions) {
      alert("DWRUtil.addOptions can only create select lists from objects.");
      return;
    }
    for (var prop in data) {
      value = DWRUtil._getValueFrom(data[prop], arguments[2]);
      text = DWRUtil._getValueFrom(data[prop], arguments[3]);
      if (text || value) {
        ele.options[ele.options.length] = new Option(text, value);
      }
    }
  }
  else {
    if (!useOptions) {
      DWRUtil.debug("DWRUtil.addOptions can only create select lists from objects.");
      return;
    }
    for (var prop in data) {
      if (typeof data[prop] != "function") {
        if (arguments[2]) {
          ele.options[ele.options.length] = new Option(prop, data[prop]);
        }
        else {
          ele.options[ele.options.length] = new Option(data[prop], prop);
        }
      }
    }
  }
};

/**
 * @private Get the data from an array function for DWRUtil.addOptions
 */
DWRUtil._getValueFrom = function(data, method) {
  if (method == null) return data;
  else if (typeof method == 'function') return method(data);
  else return data[method];
};

/**
 * Remove all the options from a select list (specified by id)
 * @see http://getahead.ltd.uk/dwr/browser/lists
 */
DWRUtil.removeAllOptions = function(ele) {
  ele = DWRUtil._getElementById(ele, "removeAllOptions()");
  if (ele == null) return;
  var useOptions = DWRUtil._isHTMLElement(ele, "select");
  var useLi = DWRUtil._isHTMLElement(ele, ["ul", "ol"]);
  if (!useOptions && !useLi) {
    DWRUtil.debug("removeAllOptions() can only be used with select, ol and ul elements. Attempt to use: " + DWRUtil._detailedTypeOf(ele));
    return;
  }
  if (useOptions) {
    ele.options.length = 0;
  }
  else {
    while (ele.childNodes.length > 0) {
      ele.removeChild(ele.firstChild);
    }
  }
};

/**
 * Create rows inside a the table, tbody, thead or tfoot element (given by id).
 * @see http://getahead.ltd.uk/dwr/browser/tables
 */
DWRUtil.addRows = function(ele, data, cellFuncs, options) {
  ele = DWRUtil._getElementById(ele, "addRows()");
  if (ele == null) return;
  if (!DWRUtil._isHTMLElement(ele, ["table", "tbody", "thead", "tfoot"])) {
    DWRUtil.debug("addRows() can only be used with table, tbody, thead and tfoot elements. Attempt to use: " + DWRUtil._detailedTypeOf(ele));
    return;
  }
  if (!options) options = {};
  if (!options.rowCreator) options.rowCreator = DWRUtil._defaultRowCreator;
  if (!options.cellCreator) options.cellCreator = DWRUtil._defaultCellCreator;
  var tr, rowNum;
  if (DWRUtil._isArray(data)) {
    for (rowNum = 0; rowNum < data.length; rowNum++) {
      options.rowData = data[rowNum];
      options.rowIndex = rowNum;
      options.rowNum = rowNum;
      options.data = null;
      options.cellNum = -1;
      tr = DWRUtil._addRowInner(cellFuncs, options);
      if (tr != null) ele.appendChild(tr);
    }
  }
  else if (typeof data == "object") {
    rowNum = 0;
    for (var rowIndex in data) {
      options.rowData = data[rowIndex];
      options.rowIndex = rowIndex;
      options.rowNum = rowNum;
      options.data = null;
      options.cellNum = -1;
      tr = DWRUtil._addRowInner(cellFuncs, options);
      if (tr != null) ele.appendChild(tr);
      rowNum++;
    }
  }
};

/**
 * @private Internal function to draw a single row of a table.
 */
DWRUtil._addRowInner = function(cellFuncs, options) {
  var tr = options.rowCreator(options);
  if (tr == null) return null;
  for (var cellNum = 0; cellNum < cellFuncs.length; cellNum++) {
    var func = cellFuncs[cellNum];
    var reply = func(options.rowData, options);
    options.data = reply;
    options.cellNum = cellNum;
    var td = options.cellCreator(options);
    if (td != null) {
      if (reply != null) {
        if (DWRUtil._isHTMLElement(reply)) td.appendChild(reply);
        else td.innerHTML = reply;
      }
      tr.appendChild(td);
    }
  }