| author | John Kern <johnk@symbian.org> |
| Tue, 11 May 2010 10:45:33 -0700 | |
| changeset 326 | e2a66d30f677 |
| parent 230 | 7848c135d915 |
| permissions | -rw-r--r-- |
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<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
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<html lang="en" xml:lang="en"> |
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<head> |
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<meta content="text/html; charset=utf-8" http-equiv="Content-Type" /> |
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<meta name="copyright" content="(C) Copyright 2005" /> |
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<meta name="DC.rights.owner" content="(C) Copyright 2005" /> |
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<meta content="concept" name="DC.Type" /> |
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<meta name="DC.Title" content="Using selection controls" /> |
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<meta scheme="URI" name="DC.Relation" content="WRTKit_Common_WRTKit_tasks-GUID-24870895-4449-4307-9a54-7c90f7b3905e.html" /> |
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<meta content="XHTML" name="DC.Format" /> |
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<meta content="GUID-5E36D276-CCE8-4BC9-BCBA-78E721ADB8C6" name="DC.Identifier" /> |
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<meta content="en" name="DC.Language" /> |
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<link href="commonltr.css" type="text/css" rel="stylesheet" /> |
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<title> |
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Using selection controls</title> |
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</head> |
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<body id="GUID-5E36D276-CCE8-4BC9-BCBA-78E721ADB8C6"><a name="GUID-5E36D276-CCE8-4BC9-BCBA-78E721ADB8C6"><!-- --></a> |
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<h1 class="topictitle1"> |
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Using selection controls</h1> |
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<div> |
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<p> |
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Selection controls are used to let users make selections among a set |
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of options. The WRTKit has two controls: SelectionList and |
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SelectionMenu that have an identical API but differ in look and |
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feel. The SelectionList shows all the options and selections |
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directly in the view while the SelectionMenu only shows the selected |
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options and opens up a menu with the options when the user activates |
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the control. Selection controls can either be in single or multiple |
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selection mode. In single selection mode only one of the options can |
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be selected at a time while in multiple selection mode any number |
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(including zero) can be selected. |
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</p> |
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<div class="fignone" id="GUID-5E36D276-CCE8-4BC9-BCBA-78E721ADB8C6__GUID-9F9B7E8B-2E27-4D95-AFBD-246DD16580B2"><a name="GUID-5E36D276-CCE8-4BC9-BCBA-78E721ADB8C6__GUID-9F9B7E8B-2E27-4D95-AFBD-246DD16580B2"><!-- --></a><span class="figcap">Figure 1. |
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SelectionList controls</span> |
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<br /><img src="SelectionList_Controls_Screenshot_1.png" /><br /> |
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</div> |
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<p> |
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The SelectionList control is recommended to be used with the pointer |
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navigation mode or if there are few options to choose from. The |
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SelectionMenu control is recommended for large numbers of options or in |
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the tab navigation mode. |
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</p> |
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<div class="fignone" id="GUID-5E36D276-CCE8-4BC9-BCBA-78E721ADB8C6__GUID-B3A04D05-2DA2-48B1-B37F-F0803B499DCC"><a name="GUID-5E36D276-CCE8-4BC9-BCBA-78E721ADB8C6__GUID-B3A04D05-2DA2-48B1-B37F-F0803B499DCC"><!-- --></a><span class="figcap">Figure 2. |
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SelectionMenu control</span> |
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<br /><img src="SelectionMenu_Control_Screenshot_1.png" /><br /> |
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</div> |
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<p> |
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The options of a selection control are defined as an array of option |
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objects, each with two properties: value and text. The value |
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property can be any JavaScript value and represent the concrete |
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value of the option, while the text property is a string that is |
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shown in the user interface for the option. |
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</p> |
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<p> |
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Option arrays can conveniently be created using JavaScript object |
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notation (JSON) for example as follows: |
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</p> |
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<pre> |
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// create an array with three options |
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var options = [ |
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{ value: 1, text: "Coffee" },
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{ value: 2, text: "Tea" },
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{ value: 3, text: "Water" }
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]; |
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</pre> |
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<p> |
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The selected options are defined differently depending on whether |
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the selection control is in single or multiple selection mode. In |
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single selection mode the selected option is defined as a reference |
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to the option in the control that should be selected. In multiple |
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selection mode the selected options set is defined as an array of |
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references to options in the control. Note that the references must |
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be to one of the options objects defined for the control. It is not |
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sufficient to define new option objects that happen to be identical |
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to the ones in the control. |
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</p> |
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<pre> |
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// create a set of two selected options for multiple selection control |
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var selectedOptions = [ options[1], options[2] ]; |
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</pre> |
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<p> |
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Note that the selectedOptions array is constructed so that the two |
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elements in the array refer to the "Tea" and "Water" options in the |
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options array. |
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</p> |
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112 |
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<p> |
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The code below creates a SelectionList control in multiple selection |
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mode and initializes it with the options and selectedOptions arrays |
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created above. The code assumes that a view has already been created |
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and that a variable called exampleView refers to it. |
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</p> |
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120 |
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<pre> |
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// create selection list control |
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var drinkList = new SelectionList("selection1", "Favorite drinks",
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options, true, selectedOptions); |
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exampleView.addControl(drinkList); |
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</pre> |
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128 |
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<p> |
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130 |
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"selection1" is a unique identifier for the control, "Favorite |
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drinks" is the control caption, the option argument refers to the |
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options array that we previously created, the following argument |
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determines whether the control is in multiple selection mode, and |
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finally the selectedOptions argument refers to the array with |
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selected options and defines which of the options in the control |
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should be selected by default. |
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</p> |
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139 |
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<p> |
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141 |
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All of the arguments are optional and can be specified later as |
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needed. For example if the options are not known when the control |
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is created, or if the options change, they can be set using the |
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setOptions() method. In the same way the selected options can be |
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set using the setSelected() method. |
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</p> |
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148 |
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<pre> |
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150 |
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// set options |
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drinkList.setOptions(options); |
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153 |
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// set selected options |
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drinkList.setSelected(selectedOptions); |
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</pre> |
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157 |
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<p> |
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159 |
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The currently selected options can be retrieved using the |
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getSelected() method. As mentioned earlier, in single selection mode |
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the selected is just a single reference to an option (or null if no |
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option is selected), while in multiple selection mode it's an array |
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with references to the selected options. If no options are selected |
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in multiple selection mode then the array is empty. |
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</p> |
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167 |
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<pre> |
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169 |
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// find out which options are currently selected |
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var selected = drinkList.getSelected(); |
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</pre> |
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173 |
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<p> |
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175 |
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Selection controls fire "SelectionChanged" events when a user changes |
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the selection of options in a control. These events can be handled |
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using by registering an event listener to the control. The code below |
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shows what a typical callback function would look like: |
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</p> |
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181 |
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<pre> |
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183 |
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// Callback function for selection change events. |
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function favoriteDrinkChanged(event) {
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// implement what happens when the selection changed here |
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} |
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</pre> |
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189 |
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<p> |
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191 |
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Registering the event listener function is done as follows, for |
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example right after the control was created: |
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194 |
</p> |
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195 |
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<pre> |
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197 |
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// register event listener |
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drinkList.addEventListener("SelectionChanged", favoriteDrinkChanged);
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</pre> |
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201 |
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202 |
</div> |
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203 |
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<div> |
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<div class="familylinks"> |
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206 |
<div class="parentlink"><strong>Parent topic:</strong> <a href="WRTKit_Common_WRTKit_tasks-GUID-24870895-4449-4307-9a54-7c90f7b3905e.html">Common WRTKit tasks</a></div> |
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</div> |
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</div> |
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209 |
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</body> |
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</html> |