summaryrefslogtreecommitdiff
path: root/framework/Web/UI/WebControls/TDropDownList.php
blob: f00466d55ca875b6df23e48093ad3f6d23790894 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
<?php
/**
 * TDropDownList class file
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005-2008 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @version $Id$
 * @package System.Web.UI.WebControls
 */

/**
 * Includes TListControl class
 */
Prado::using('System.Web.UI.WebControls.TListControl');

/**
 * TDropDownList class
 *
 * TDropDownList displays a dropdown list on a Web page.
 * It inherits all properties and events from {@link TListControl}.
 *
 * Since v3.0.3, TDropDownList starts to support optgroup. To specify an option group for
 * a list item, set a Group attribute with it,
 * <code>
 *  $listitem->Attributes->Group="Group Name";
 *  // or <com:TListItem Attributes.Group="Group Name" .../> in template
 * </code>
 *
 * Since v3.1.1, TDropDownList starts to support prompt text. That is, a prompt item can be
 * displayed as the first list item by specifying either {@link setPromptText PromptText} or
 * {@link setPromptValue PromptValue}, or both. Choosing the prompt item will unselect the TDropDownList.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id$
 * @package System.Web.UI.WebControls
 * @since 3.0
 */
class TDropDownList extends TListControl implements IPostBackDataHandler, IValidatable
{
	private $_dataChanged=false;

	/**
	 * Adds attributes to renderer.
	 * @param THtmlWriter the renderer
	 */
	protected function addAttributesToRender($writer)
	{
		$writer->addAttribute('name',$this->getUniqueID());
		parent::addAttributesToRender($writer);
	}

	/**
	 * Gets the name of the javascript class responsible for performing postback for this control.
	 * This method overrides the parent implementation.
	 * @return string the javascript class name
	 */
	protected function getClientClassName()
	{
		return 'Prado.WebUI.TDropDownList';
	}

	/**
	 * Loads user input data.
	 * This method is primarly used by framework developers.
	 * @param string the key that can be used to retrieve data from the input data collection
	 * @param array the input data collection
	 * @return boolean whether the data of the component has been changed
	 */
	public function loadPostData($key,$values)
	{
		if(!$this->getEnabled(true))
			return false;
		$this->ensureDataBound();
		$selection=isset($values[$key])?$values[$key]:null;
		if($selection!==null)
		{
			$index=$this->getItems()->findIndexByValue($selection,false);
			if($this->getSelectedIndex()!==$index)
			{
				$this->setSelectedIndex($index);
				return $this->_dataChanged=true;
			}
		}
		return false;
	}

	/**
	 * Raises postdata changed event.
	 * This method is required by {@link IPostBackDataHandler} interface.
	 * It is invoked by the framework when {@link getSelectedIndex SelectedIndex} property
	 * is changed on postback.
	 * This method is primarly used by framework developers.
	 */
	public function raisePostDataChangedEvent()
	{
		if($this->getAutoPostBack() && $this->getCausesValidation())
			$this->getPage()->validate($this->getValidationGroup());
		$this->onSelectedIndexChanged(null);
	}

	/**
	 * Returns a value indicating whether postback has caused the control data change.
	 * This method is required by the IPostBackDataHandler interface.
	 * @return boolean whether postback has caused the control data change. False if the page is not in postback mode.
	 */
	public function getDataChanged()
	{
		return $this->_dataChanged;
	}

	/**
	 * @throws TNotSupportedException if this method is invoked
	 */
	public function setSelectedIndices($indices)
	{
		throw new TNotSupportedException('dropdownlist_selectedindices_unsupported');
	}

	/**
	 * Returns the value to be validated.
	 * This methid is required by IValidatable interface.
	 * @return mixed the value of the property to be validated.
	 */
	public function getValidationPropertyValue()
	{
		return $this->getSelectedValue();
	}
}
?>