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Filename : combobox.js
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/*
 * The MIT License
 *
 * Copyright (c) 2004-2010, Sun Microsystems, Inc., Kohsuke Kawaguchi
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

if (typeof UTILITIES_VERSION == "undefined" || UTILITIES_VERSION < 0.1) {
  console.log("A suitable version of the Utilities class is not available");
}

COMBOBOX_VERSION = 0.1;

/*
Sample CSS for the combobox
	.comboBoxList {
		padding: 0px;
		border: 1px solid #999;
		background-color: #f7f7ff;
		overflow: visible;
	}
	.comboBoxItem {
		margin: 0px;
		padding: 2px 5px;
		background-color: inherit;
		cursor: default;
	}
	.comboBoxSelectedItem {
		background-color: #ddf;
	}
*/

/**
 * I create a new combobox, using the specified text input field and
 * population callback.  The item list is styled with three CSS
 * classes: comboBoxList, comboBoxItem, and comboBoxSelectedItem, which
 * are for the containing DIV, the individual item DIVs, and for the
 * currently selected item DIV.  Note that the selected item has both
 * the item and selectedItem classes applied.  Sample CSS is available
 * in a comment at the top of the implementation file.
 *
 * The 'config' argument allows passing of additional parameters that
 * further govern the behaviour of the combo box.  Supported parameters
 * are listed here:
 * 	allowMultipleValues - whether the form field should allow multiple
 *		values to be provided.  Each individual value will get it's own
 *		separate dropdown with, so a field value such as "dog,ca" would
 *		operate as if the value were just "ca" (i.e. just "ca" would be
 *		passed to the callback, and a selection choice would only
 *		replace the "ca").  Defaults to false.
 *	valueDelimiter - if allowMultipleValues is set to true, this is the
 *		character used to delimit the values.  Defaults to a comma.
 *
 * @param idOrField The ID of the text field the combobox is based around, or the field itself.
 * @param callback The function to call when the typed value changes.
 *		The function will be passed the current value of the field, and
 *		must return an array of values to display in the dropdown.
 * @param config additional config parameters, as explained above.
 * @param config An object containing configuration parameters for the
 *		instance.
 */
function ComboBox(idOrField, callback, config) {
  var self = this;
  // instance variables
  this.config = config || new Object();
  this.callback = callback;
  this.availableItems = new Array();
  this.selectedItemIndex = -1;
  this.field =
    typeof idOrField == "string"
      ? document.getElementById(idOrField)
      : idOrField;
  if (typeof this.field == "undefined") {
    alert(
      "You have specified an invalid id for the field you want to turn into a combo box",
    );
  }
  this.dropdown = document.createElement("div");
  this.isDropdownShowing = false;
  this.oldonsubmit = null;

  // configure the dropdown div
  this.dropdown.className = "comboBoxList";
  document.body.appendChild(this.dropdown);
  this.dropdown.style.position = "absolute";
  this.moveDropdown();
  this.hideDropdown();

  // initialize the field
  this.field.comboBox = this;
  this.field.oldValue = this.field.value;
  this.field.onkeyup = ComboBox.onKeyUp;
  this.field.moveCaretToEnd = function () {
    if (this.createTextRange) {
      var range = this.createTextRange();
      range.collapse(false);
      range.select();
    } else if (this.setSelectionRange) {
      this.focus();
      var length = this.value.length;
      this.setSelectionRange(length, length);
    }
  };
  this.field.onfocus = function () {
    this.comboBox.oldonsubmit = this.form.onsubmit;
    this.form.onsubmit = function () {
      if (self.isDropdownShowing) {
        return false;
      }
      if (self.oldonsubmit) {
        self.oldonsubmit.call(this);
      }
      return true;
    };
    // repopulate and display the dropdown
    this.comboBox.valueChanged();
  };
  this.field.onblur = function () {
    var cb = this.comboBox;
    this.hideTimeout = setTimeout(function () {
      cb.hideDropdown();
    }, 100);
    this.form.onsubmit = cb.oldonsubmit;
  };

  // privileged methods
  this.getConfigParam = function (name, defVal) {
    return self.config[name] || defVal;
  };
}

/**
 * I am the onKeyDown listener that gets installed on the input field
 * that is the core of the ComboBox.  I handle action operations.
 *
 * @param e The event object on Mozilla browsers, null on IE
 */
ComboBox.onKeyDown = function (e) {
  if (!e) {
    e = window.event;
  }
  var capture = function () {
    e.cancelBubble = true;
    if (e.stopPropagation) {
      e.stopPropagation();
    }
  };
  switch (e.keyCode) {
    case 13: // enter
    case 9: // tab
      this.comboBox.chooseSelection();
      capture();
      return false;
    case 27: // escape
      this.comboBox.hideDropdown();
      capture();
      break;
    case 38: // up arrow
      this.comboBox.selectPrevious();
      capture();
      break;
    case 40: // down arrow
      this.comboBox.selectNext();
      capture();
      break;
  }
};

/**
 * I am the onKeyUp listener that gets installed on the input field
 * that is the core of the ComboBox.  I handle value-change operations.
 *
 * @param e The event object on Mozilla browsers, null on IE
 */
ComboBox.onKeyUp = function (e) {
  if (!e) {
    e = window.event;
  }
  var capture = function () {
    e.cancelBubble = true;
    if (e.stopPropagation) {
      e.stopPropagation();
    }
  };
  switch (e.keyCode) {
    case 38: // up arrow
    case 40: // down arrow
      this.moveCaretToEnd();
      capture();
      break;
    default:
      if (this.value != this.oldValue) {
        this.comboBox.valueChanged();
        this.oldValue = this.value;
      }
      capture();
  }
};

/**
 * I am called by the onKeyUp listener when the entered value changes,
 * and am responsible for invoking the application callback function
 * and repopulating the dropdown, if appropriate.
 */
ComboBox.prototype.valueChanged = function () {
  var value = this.field.value;
  if (this.getConfigParam("allowMultipleValues", false)) {
    value = value.split(this.getConfigParam("valueDelimiter", ","));
    value = value[value.length - 1].replace(/^ +/, "").replace(/ +$/, "");
  }
  var a = this.callback(value, this);
  if (typeof a == "undefined") {
    // to catch null returns
    return;
  }
  this.setItems(a);
};

/**
 * I can be called at any time with a new set of items to display in
 * the dropdown.
 *
 * @param items The array of items that should be used for the dropdown
 *		values.
 */
ComboBox.prototype.setItems = function (items) {
  if (typeof items != "object") {
    alert("setItems wasn't passed a valid array: " + typeof a);
    return;
  }
  this.availableItems = items;
  this.populateDropdown();
};

/**
 * I am called to repopulate the dropdown.  There should never be a
 * need to invoke me externally.
 */
ComboBox.prototype.populateDropdown = function () {
  if (this.availableItems.length > 0) {
    Utilities.removeChildren(this.dropdown);
    for (var i = 0; i < this.availableItems.length; i++) {
      var item = document.createElement("div");
      item.className = "comboBoxItem";
      item.innerText = this.availableItems[i];
      item.id = "item_" + this.availableItems[i];
      item.comboBox = this;
      item.comboBoxIndex = i;
      item.onmouseover = function () {
        this.comboBox.select(this.comboBoxIndex);
      };
      item.onmousedown = function () {
        this.comboBox.choose(this.comboBoxIndex);
      };
      this.dropdown.appendChild(item);
    }
    this.selectedItemIndex = 0;
    this.updateSelection();
    this.showDropdown();
  } else {
    this.selectedItemIndex = -1;
    this.hideDropdown();
  }
};

/**
 * I am called by a mouse listener on the dropdown items to choose a
 * specific item straight away.
 *
 * @param index The index of the item to choose
 */
ComboBox.prototype.choose = function (index) {
  if (this.select(index)) {
    this.chooseSelection();
  }
};

/**
 * I am called by the onKeyUp listener to indicate that the user wants
 * to use the current selection as the new value of the field.
 */
ComboBox.prototype.chooseSelection = function () {
  var i = this.selectedItemIndex;
  var a = this.availableItems;
  if (i >= 0 && i < a.length) {
    var valueToAdd = a[i].replace(/<[^>]+>/g, "");
    if (this.getConfigParam("allowMultipleValues", false)) {
      var currentValue = "";
      var delim = this.getConfigParam("valueDelimiter", ",");
      var values = this.field.value.split(delim);
      for (var j = 0; j < values.length - 1; j++) {
        currentValue = Utilities.listAppend(currentValue, values[j], delim);
      }
      this.field.value = Utilities.listAppend(currentValue, valueToAdd, delim);
    } else {
      this.field.value = valueToAdd;
    }

    this.field.oldValue = this.field.value;
    this.field.focus();
    this.field.moveCaretToEnd();
    this.hideDropdown();
  }
};

/**
 * I am called by a mouse listener on the dropdown items to select a
 * specific item straight away.
 *
 * @param index The index of the item to select
 * @return whether the selection happened (the index was valid)
 */
ComboBox.prototype.select = function (index) {
  if (index < 0 || index >= this.availableItems.length) {
    return false;
  }
  this.selectedItemIndex = index;
  this.updateSelection();
  return true;
};

/**
 * I am called by the onKeyUp listener to indicate that the user wants
 * to select the next option in the dropdown.
 */
ComboBox.prototype.selectNext = function () {
  if (this.selectedItemIndex >= this.availableItems.length - 1) {
    return false;
  }
  this.selectedItemIndex++;
  this.updateSelection();
  return true;
};

/**
 * I am called by the onKeyUp listener to indicate that the user wants
 * to select the previous option in the dropdown.
 */
ComboBox.prototype.selectPrevious = function () {
  if (this.selectedItemIndex <= 0) {
    return false;
  }
  this.selectedItemIndex--;
  this.updateSelection();
};

/**
 * I show the dropdown DIV.
 */
ComboBox.prototype.showDropdown = function () {
  this.moveDropdown();
  clearTimeout(this.field.hideTimeout);
  this.dropdown.style.display = "block";
  this.field.onkeydown = ComboBox.onKeyDown;
  this.isDropdownShowing = true;
};

/**
 * I hide the dropdown DIV.
 */
ComboBox.prototype.hideDropdown = function () {
  var self = this;
  setTimeout(function () {
    self.isDropdownShowing = false;
  }, 100);
  this.field.onkeydown = null;
  this.dropdown.style.display = "none";
};

ComboBox.prototype.moveDropdown = function () {
  var offsets = Utilities.getOffsets(this.field);
  this.dropdown.style.top =
    offsets.y + (this.field.offsetHeight ? this.field.offsetHeight : 22) + "px";
  this.dropdown.style.left = offsets.x + "px";
  this.dropdown.style.width =
    (this.field.offsetWidth ? this.field.offsetWidth : 100) + "px";
};

/**
 * I update the dropdown so that the display reflects the internally
 * selected item,
 */
ComboBox.prototype.updateSelection = function () {
  for (var i = 0; i < this.dropdown.childNodes.length; i++) {
    if (i == this.selectedItemIndex) {
      this.dropdown.childNodes[i].className += " comboBoxSelectedItem";
    } else {
      this.dropdown.childNodes[i].className = this.dropdown.childNodes[
        i
      ].className.replace(/ *comboBoxSelectedItem */g, "");
    }
  }
};