util.js

反ajax原代码

 * Highlight that an element has changed
 */
dwr.util.highlight = function(ele, options) {
  if (options && options.highlightHandler) {
    options.highlightHandler(dwr.util.byId(ele));
  }
  else if (dwr.util._highlightHandler != null) {
    dwr.util._highlightHandler(dwr.util.byId(ele));
  }
};

/**
 * Set the value an HTML element to the specified value.
 * @see http://getahead.ltd.uk/dwr/browser/util/setvalue
 */
dwr.util.setValue = function(ele, val, options) {
  if (val == null) val = "";
  if (options == null) options = {};
  if (dwr.util._shouldEscapeHtml(options) && typeof(val) == "string") {
    val = dwr.util.escapeHtml(val);
  }

  var orig = ele;
  var nodes, node, i;
  ele = dwr.util.byId(ele);

  // We can work with names and need to sometimes for radio buttons
  if (ele == null) {
    nodes = document.getElementsByName(orig);
    if (nodes.length >= 1) ele = nodes.item(0);
  }

  if (ele == null) {
    dwr.util._debug("setValue() can't find an element with id/name: " + orig + ".");
    return;
  }

  // All paths now lead to some update so we highlight a change
  dwr.util.highlight(ele, options);

  if (dwr.util._isHTMLElement(ele, "select")) {
    if (ele.type == "select-multiple" && dwr.util._isArray(val)) dwr.util._selectListItems(ele, val);
    else dwr.util._selectListItem(ele, val);
    return;
  }

  if (dwr.util._isHTMLElement(ele, "input")) {
    if (ele.type == "radio") {
      // Some browsers match names when looking for ids, so check names anyway.
      if (nodes == null) nodes = document.getElementsByName(orig);
      if (nodes != null && nodes.length > 1) {
        for (i = 0; i < nodes.length; i++) {
          node = nodes.item(i);
          if (node.type == "radio") node.checked = (node.value == val);
        }
      }
      else ele.checked = (val == true);
    }
    else if (ele.type == "checkbox") ele.checked = val;
    else ele.value = val;

    return;
  }

  if (dwr.util._isHTMLElement(ele, "textarea")) {
    ele.value = val;
    return;
  }

  // If the value to be set is a DOM object then we try importing the node
  // rather than serializing it out
  if (val.nodeType) {
    if (val.nodeType == 9 /*Node.DOCUMENT_NODE*/) val = val.documentElement;
    val = dwr.util._importNode(ele.ownerDocument, val, true);
    ele.appendChild(val);
    return;
  }

  // Fall back to innerHTML
  ele.innerHTML = val;
};

/**
 * @private Find multiple items in a select list and select them. Used by setValue()
 * @param ele The select list item
 * @param val The array of values to select
 */
dwr.util._selectListItems = 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;
  var j;
  for (i = 0; i < ele.options.length; i++) {
    ele.options[i].selected = false;
    for (j = 0; j < val.length; j++) {
      if (ele.options[i].value == val[j]) {
        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
 */
dwr.util._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
 */
dwr.util.getValue = function(ele, options) {
  if (options == null) options = {};
  var orig = ele;
  ele = dwr.util.byId(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) {
    dwr.util._debug("getValue() can't find an element with id/name: " + orig + ".");
    return "";
  }

  if (dwr.util._isHTMLElement(ele, "select")) {
    // Using "type" property instead of "multiple" as "type" is an official 
	// client-side property since JS 1.1
    if (ele.type == "select-multiple") {
      var reply = new Array();
      for (i = 0; i < ele.options.length; i++) {
        var item = ele.options[i];
        if (item.selected) {
          if (item.value != null && item.value != "") {
            reply.push(item.value);
          }
          else {
            reply.push(item.text);
          }
        }
      }
      return reply;
    }
    else {
      var sel = ele.selectedIndex;
      if (sel != -1) {
        var item = ele.options[sel];
        if (item.value != null && item.value != "") {
          return item.value;
        }
        return item.text;
      }
      else {
        return "";
      }
    }
  }

  if (dwr.util._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 (dwr.util._isHTMLElement(ele, "textarea")) {
    return ele.value;
  }

  if (dwr.util._shouldEscapeHtml(options)) {
    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
 */
dwr.util.getText = function(ele) {
  ele = dwr.util._getElementById(ele, "getText()");
  if (ele == null) return null;
  if (!dwr.util._isHTMLElement(ele, "select")) {
    dwr.util._debug("getText() can only be used with select elements. Attempt to use: " + dwr.util._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
 */
dwr.util.setValues = function(map, options) {
  var prefixes = [];
  if (options && options.prefix) prefixes.push(options.prefix);
  dwr.util._getDataProperties(map, prefixes);
};

/**
 * @private retrieve values for the map and set the corresponding form fields. For object properties, recursively
 * read sub properties in order to matching nested form fields.
 */
dwr.util._getDataProperties = function(map, prefixes) {
  for (var property in map) {
  	// Only recurse into plain objects, ie not functions, arrays, etc
    if (dwr.util._isObject(map[property]) && !dwr.util._isArray(map[property])) {
      var prefixClone = [];
      for (var i = 0; i < prefixes.length; i++) {
        prefixClone.push(prefixes[i]);
      }
      prefixClone.push(property);
      dwr.util._getDataProperties(map[property], prefixClone);
    } else {
      var nestedProperty = property;
      if (prefixes.length > 0) {
        nestedProperty = (prefixes.join(".")) + "." + property;
      }
      // Are there any elements with that id or name
      if (dwr.util.byId(nestedProperty) != null || document.getElementsByName(nestedProperty).length >= 1) {
        dwr.util.setValue(nestedProperty, 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
 */
dwr.util.getValues = function(data, options) {
  var ele;
  if (typeof data == "string") ele = dwr.util.byId(data);
  if (dwr.util._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] = dwr.util.getValue(ele[i]);
    }
    return reply;
  }
  else {
    var prefixes = [];
    if (options != null && options.prefix) prefixes.push(options.prefix);
    dwr.util._setDataProperties(data, prefixes);
    return data;
  }
};

/**
 * @private for each object property, set html field value if present. Recurse for object properties.
 */
dwr.util._setDataProperties = function(data, prefixes) {
  for (var property in data) {
  	// Only recurse into plain objects, ie not functions, arrays, etc
    if (dwr.util._isObject(data[property]) && !dwr.util._isArray(data[property])) {
      var prefixClone = [];
      for (var i = 0; i < prefixes.length; i++) {
        prefixClone.push(prefixes[i]);
      }
      prefixClone.push(property);
      dwr.util._setDataProperties(data[property], prefixClone);
    }
    else
    {
      var nestedProperty = property;
      if (prefixes.length > 0) {
        nestedProperty = (prefixes.join(".")) + "." + property;
      }
      // Are there any elements with that id or name
      if (dwr.util.byId(nestedProperty) != null || document.getElementsByName(nestedProperty).length >= 1) {
        data[property] = dwr.util.getValue(nestedProperty);
      }
    }
  }
};

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

  var text, value, li;
  if (dwr.util._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 = dwr.util._getValueFrom(data[i], arguments[3]);
            value = dwr.util._getValueFrom(data[i], arguments[2]);
          }
          else text = value = dwr.util._getValueFrom(data[i], arguments[2]);
        }
        else text = value = dwr.util._getValueFrom(data[i], arguments[3]);

        if (text != null || value) ele.options[ele.options.length] = new Option(text, value);
      }
      else {
        li = document.createElement("li");
        value = dwr.util._getValueFrom(data[i], arguments[2]);
        if (value != null) {
          li.innerHTML = value;
          ele.appendChild(li);
        }
      }
    }
  }
  else if (arguments[3] != null) {
    if (!useOptions) {
      alert("dwr.util.addOptions can only create select lists from objects.");