Form标签
在Flex中,Form标签的意义仅限于布局我们称之为控件的UI组件。id属性
MXML的id属性是ActionScript访问组件所包含值的重要途径。示例:使用id属性访问控件的值
<?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"> <fx:Declarations> <!-- 将非可视元素(例如服务、值对象)放在此处 --> </fx:Declarations> <fx:Script> <![CDATA[ import mx.controls.Alert; public function showtext():void { mx.controls.Alert.show("idMe is " + meId.text); } ]]> </fx:Script> <s:Label id="meId" text="Hello World!!!" click="showtext()"/> </s:Application>
Flex控件分类
- Text控件:
<?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"> <fx:Declarations> <!-- 将非可视元素(例如服务、值对象)放在此处 --> </fx:Declarations> <fx:Script> <![CDATA[ import mx.controls.Alert; public function showMsg(msg:String):void { Alert.show(msg); } ]]> </fx:Script> <s:Panel title="Profile" verticalCenter="0" horizontalCenter="0"> <s:layout> <s:VerticalLayout/> </s:layout> <s:Label text="Enter your name" fontWeight="bold"/> <s:TextInput id="yourName" valueCommit="showMsg(yourName.text)"/> <s:Label text="Profile Summary" fontWeight="bold"/> <s:TextArea id="aboutYou" textAlign="center" width="100%" height="40" valueCommit="showMsg(aboutYou.text)"/> <s:Label text="Enter your profile" fontWeight="bold" color="#ff0000"/> <mx:RichTextEditor id="fullProfile" height="150" valueCommit="showMsg(fullProfile.text)"/> </s:Panel> </s:Application>RichText、RichEditableText 需要通过制定content属性来提供数据,content属性支持如下标签:
<p> <span> <br/>
<?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"> <fx:Declarations> <!-- 将非可视元素(例如服务、值对象)放在此处 --> </fx:Declarations> <fx:Script> <![CDATA[ ]]> </fx:Script> <s:Panel title="Howdy" verticalCenter="0" horizontalCenter="0" width="300"> <s:layout> <s:VerticalLayout/> </s:layout> <s:RichText textAlign="center" color="#127892" width="100%"> <s:content> Greetings <s:span fontWeight="bold" color="#ff0000">People</s:span> of<s:br/> <s:span fontSize="20"> EARTH! </s:span> </s:content> </s:RichText> </s:Panel> </s:Application>
- Date控件:
<?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"> <fx:Declarations> <!-- 将非可视元素(例如服务、值对象)放在此处 --> </fx:Declarations> <fx:Script> <![CDATA[ import mx.controls.Alert; public function showMsg(msg:String):void{ mx.controls.Alert.show(msg); } ]]> </fx:Script> <s:Panel title="Profile" verticalCenter="0" horizontalCenter="0"> <s:layout> <s:VerticalLayout/> </s:layout> <mx:DateField text="12/05/2010" id="thisDateField" change="showMsg(thisDateField.selectedDate.toString())"/> <mx:DateChooser id="thisDateChooser" maxYear="2012" minYear="2010" selectedDate="{new Date(2010,10,15)}" change="showMsg(thisDateChooser.selectedDate.toString())"> </mx:DateChooser> </s:Panel> </s:Application>
- Numeric控件:
<?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"> <fx:Declarations> <!-- 将非可视元素(例如服务、值对象)放在此处 --> </fx:Declarations> <fx:Script> <![CDATA[ import mx.controls.Alert; public function showMsg(msg:String):void{ mx.controls.Alert.show(msg); } ]]> </fx:Script> <s:Panel title="Profile"> <s:layout> <s:HorizontalLayout/> </s:layout> <s:VGroup> <s:Label fontWeight="bold" text="how many kids do you have?"/> <s:NumericStepper id="kids" minimum="0" maximum="10" stepSize="1" change="showMsg(kids.value.toString())"/> <s:HGroup> <s:Label fontWeight="bold" text="Kids in college?"/> <s:Spinner minimum="0" maximum="10" id="collegeKids"/> <s:Label text="{collegeKids.value} in College"/> </s:HGroup> <s:Label fontWeight="bold" text="How long is your commute (mins)?"/> <mx:HSlider id="commuteTimeRange" minimum="0" maximum="180" snapInterval="5" tickInterval="15" labels="[0 mins,180 mins]" thumbCount="1" change="showMsg(commuteTimeRange.value.toString())"> </mx:HSlider> </s:VGroup> <s:VGroup> <s:Label fontWeight="bold" text="How tall are your commute (cm)?"/> <mx:VSlider id="yourHeight" minimum="0" maximum="300" snapInterval="1" tickInterval="50" labels="[0,50,100,150,200,250,300]" change="showMsg(yourHeight.value.toString())"> </mx:VSlider> </s:VGroup> </s:Panel> </s:Application>
- 按钮
<?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"> <fx:Declarations> <!-- 将非可视元素(例如服务、值对象)放在此处 --> </fx:Declarations> <fx:Script> <![CDATA[ import mx.collections.ArrayCollection; import mx.controls.Alert; public function showMsg(msg:String):void{ mx.controls.Alert.show("You just clicked on " + msg); } [Bindable] public var myArray:ArrayCollection = new ArrayCollection(["one","two","three"]); ]]> </fx:Script> <s:Panel title="profile" width="360" height="240" horizontalCenter="0" verticalCenter="0"> <s:layout> <s:HorizontalLayout/> </s:layout> <s:VGroup> <s:Button id="thisBtn" label="Button" click="showMsg('button')"/> <mx:LinkButton id="thisLinkBtn" label="LinkButton" click="showMsg('linkButton')"/> </s:VGroup> <s:VGroup> <s:buttonbar id="thisBtnBar" dataProvider="{myArray}" click="showMsg(buttonbar(event.currentTarget).selectedItem)"/> <mx:LinkBar id="thisLinkBar" dataProvider="{myArray}" itemClick="showMsg(event.label)"/> <mx:Togglebuttonbar id="thisToggleBar" dataProvider="{myArray}" itemClick="showMsg(event.label)"/> </s:VGroup> </s:Panel> </s:Application>注意:只有Halo组件才支持itemClick,Spark的buttonbar使用的是通用的click事件,所以必须使用currentTarget属性才可以访问按下的按钮。itemClick添加了label和index属性,更容易知道单击的是哪个按钮。
PopUpMenuButton
<?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"> <fx:Declarations> <!-- 将非可视元素(例如服务、值对象)放在此处 --> </fx:Declarations> <fx:Script> <![CDATA[ import mx.collections.ArrayCollection; import mx.controls.Alert; public function showMsg(msg:String):void{ mx.controls.Alert.show("You just clicked on " + msg); } [Bindable] public var myArray:ArrayCollection = new ArrayCollection(["one","three"]); ]]> </fx:Script> <mx:PopUpMenuButton id="menuBtn" dataProvider="{myArray}" click="showMsg('left side')" itemClick="showMsg('right side with '+event.label)"/> </s:Application>PopUpButton能够显示更多的元素,但没有指定任何默认元素。
<?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"> <fx:Declarations> <!-- 将非可视元素(例如服务、值对象)放在此处 --> </fx:Declarations> <fx:Script> <![CDATA[ import mx.controls.Menu; import mx.events.MenuEvent; public var menuItems:Object = [{label:'One'},{label:'Two'},{label:'Three'}]; [Bindable] public var thisMenu:Menu = Menu.createMenu(null,menuItems,false); public function handleItemClick(event:MenuEvent):void { menuBtn.label = event.label; } ]]> </fx:Script> <mx:PopUpButton id="menuBtn" creationComplete="thisMenu.addEventListener('itemClick',handleItemClick);" popUp="{thisMenu}"/> </s:Application>
- 选单
<?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"> <fx:Declarations> <!-- 将非可视元素(例如服务、值对象)放在此处 --> </fx:Declarations> <fx:Script> <![CDATA[ import mx.controls.Alert; public function showMsg(msg:String):void { Alert.show(msg); } ]]> </fx:Script> <fx:Declarations> <s:RadioButtonGroup id="Spam" itemClick="showMsg('User picked ' + event.currentTarget.selectedValue)"/> </fx:Declarations> <s:Panel title="Profile" width="400" height="150" horizontalCenter="0" verticalCenter="0"> <s:layout> <s:VerticalLayout/> </s:layout> <s:HGroup> <s:Label text="Your Hobbies"/> <s:CheckBox id="cbVideoGames" label="Video Games" click="showMsg('Video Games is ' + cbVideoGames.selected)"/> <s:CheckBox id="cbFishing" label="Fishing" click="showMsg('Fishing is ' + cbFishing.selected)"/> </s:HGroup> <s:HGroup> <s:Label fontWeight="bold" text="Do you like spam:"/> <s:RadioButton id="rbYes" value="Yes" groupName="Spam" click="showMsg('Yes')" label="Yes"/> <s:RadioButton id="rbNo" value="No" groupName="Spam" click="showMsg('No')" label="No"/> </s:HGroup> <s:HGroup> <s:Label fontWeight="bold" text="Favorite car maker:"/> <s:DropDownList id="combo" close="showMsg('Favorite car is ' + event.currentTarget.selectedItem)"> <s:ArrayCollection> <fx:String>Ferrari</fx:String> <fx:String>Porsche</fx:String> <fx:String>Hyundai</fx:String> </s:ArrayCollection> </s:DropDownList> </s:HGroup> <s:Label fontWeight="bold" text="With the color of:"/> <mx:ColorPicker id="clr" change="showMsg('Color ' + event.currentTarget.selectedColor)"/> </s:Panel> </s:Application>
访问控件的值
向函数传递值
import mx.controls.Alert; public function showMsg(msg:String):void { Alert.show(msg); }
向函数传递事件
传递事件的关键在于,必需知道事件的类型,并导入相应的类。<?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"> <fx:Declarations> <!-- 将非可视元素(例如服务、值对象)放在此处 --> </fx:Declarations> <fx:Script> <![CDATA[ import mx.controls.Alert; import mx.events.ItemClickEvent; public function showMsg(anEvent:ItemClickEvent):void { Alert.show(anEvent.currentTarget.seletedeValue); } ]]> </fx:Script> <fx:Declarations> <s:RadioButtonGroup id="Spam" itemClick="showMsg(event)"/> </fx:Declarations> </s:Application>
直接访问属性
耦合程度最高的方式<?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"> <fx:Declarations> <!-- 将非可视元素(例如服务、值对象)放在此处 --> </fx:Declarations> <fx:Script> <![CDATA[ import mx.controls.Alert; import mx.events.ItemClickEvent; public function showMsg():void { Alert.show(Spam.seletedeValue.toString()); } ]]> </fx:Script> <fx:Declarations> <s:RadioButtonGroup id="Spam" itemClick="showMsg()"/> </fx:Declarations> </s:Application>使用组合技术
<?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"> <fx:Declarations> <!-- 将非可视元素(例如服务、值对象)放在此处 --> </fx:Declarations> <fx:Script> <![CDATA[ import mx.controls.Alert; public function checkValue(inputValue:String):void { if(inputValue.length < 5){ Alert.show("Are you sure there's not that much new?"); } } public function submitClicked():void { Alert.show("User says :" + whatsnew.text + " is new."); } ]]> </fx:Script> <s:VGroup> <s:Label text="What's new"/> <s:TextInput valueCommit="checkValue(event.currentTarget.text)" id="whatsnew"/> <s:Button label="Submit" click="submitClicked()"/> </s:VGroup> </s:Application>
应该选用哪种方式
考虑程序规模、预计的生命周期,以及其它问题。版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。