I have an Accordion component in Flex that has two children,
at the load of my page, I want to give the textvalue of a textfield in the first children to a textfield in the second children by using actionscript, but its faild
nb : when I click the secode children and I return to pass the textvalue from the first children, the action succeed!
<mx:HBox width="100%" height="310" horizontalAlign="center">
<mx:Accordion id="accordion1" width="100%" height="310" historyManagementEnabled="true">
<!-- child 1--><mx:VBox id="theme_resultat" width="95%" height="95%"
label="Résultat" horizontalAlign="center"
verticalAlign="middle">
<s:HGroup left="0" right="0" bottom="0" width="98%"
horizontalAlign="right">
<s:TextInput id="doc"/>
<mx:Button id="btnAdd" label="Add"
click="add_text(event)"
icon="#Embed('assets/images/add.png')"
paddingLeft="3" paddingRight="3"/>
</s:HGroup>
</mx:VBox>
<!-- child 2--><mx:VBox id="theme_detail" width="95%" height="95%" label="Détail"
verticalAlign="middle">
<mx:VBox width="100%" height="150" horizontalAlign="center">
<s:HGroup>
<mx:FormItem label="Titre:" paddingLeft="5">
<mx:TextInput id="doc_titre"/>
</mx:FormItem>
</s:HGroup>
</mx:VBox>
</mx:VBox>
</mx:Accordion>
</mx:HBox>
protected function add_text(event:MouseEvent):void
{
accordion1.selectedIndex=1;
doc_titre.text = doc.text;
}
}
when I click add I move to the second child, but the (mx:TextInput id="doc_titre") dont have the value of (s:TextInput id="doc"/)
for the second time I return to the child 1 and I click add, then I move to the second child and I find the value of (s:TextInput id="doc") in (mx:TextInput id="doc_titre")
What happens exactly? I think your problem may be caused by the fact that the components on the second children are not created until that view is opened, There are many solution for this, you could write some code in the creation complete oof the second view that will load the correct value, you can use databinding to bind the text inputs to the same string or you can try setting creationPolicy to all.
My answer is based on my above assumption so if I am wrong please give more details.
Check this http://help.adobe.com/en_US/flex/using/WS2db454920e96a9e51e63e3d11c0bf69084-7cb8.html#WS2db454920e96a9e51e63e3d11c0bf69084-7ae5 and try setting the creationPolicy to all then let us know if the problem is solved
Use createDefferedContent() instead:
for (var i:int = 0; i < accordion.numChildren; i++)
{
(accordion.getElementAt(i) as NavigatorContent).createDeferredContent();
}
This method creates the children and their components in the background. Don't use creationPolicy as I did since this causes memory-related issues.
Related
In my Flex code I have a Label and a VGroup container. I want to set the height of the VGroup according to the Label text.
Here is the simplified code -
<s:Group height="100%" width="100%" >
<s:Group id="titleBar" width="100%" depth="50" >
<s:Label id="titleDisplay" maxDisplayedLines="1"
color="{ColorMap.WHITE}"
color.bubble="{ColorMap.MAINTEXT}"
color.inactiveGroup="{ColorMap.MAINTEXT}"
left="10" right="35" top="1" bottom="0" minHeight="30"
verticalAlign="middle" textAlign="left"
styleName="overlayTitle"/>
</s:Group>
<s:VGroup width="100%" height="{(titleDisplay.text == "Create Pool")? "80%" : "100%"}" top="30">
<s:Group id="contentArea" width="100%" height="100%">
....
</s:Group>
</s:VGroup>
</s:Group>
So I want to set the height to 80% if the Label's text is "Create Pool", otherwise 100%.
But I am getting the following compilation error from the VGroup line -
Element type "s:VGroup" must be followed by either attribute specifications, ">" or "/>".
How to resolve this issue? I am following the code from the following link -
How i write inline conditional statement in Flex with two expressions(case)?
Please guide me how to put the conditional statement in this case.
Thanks
I resolved this issue with a custom function init().
<s:SparkSkin xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
creationComplete="init()">
private function init():void
{
if (titleDisplay.text == "Create Pool")
{
contentVGroup.height = contentVGroup.height * .8;
}
}
This is perfectly working.
Thanks
I have a Spark List with an expanding itemRenderer (snippet of it below). It works very well but I am struggling to display the fully expanded list item when calling ensureIndexIsVisible. I've tried various things with validate/invalidate to try to force the List to take the expanded item size into account but either I am doing it wrong or the List component isn't built to handle this.
In the image below, I've called myList.ensureIndexIsVisible(7);Item 7 is expanded and the header scrolled to be visible but most of the expanded item is offscreen.
Anyone know a way to address this?
Update: If the List is specified to have useVirtualLayout="false" then the following works:
myList.validateNow();
myList.ensureIndexIsVisible(expandIndex);
but of course if there are a lot of cells in the List instance then this is a problem.
protected function expandOne_clickHandler(event:MouseEvent):void
{
var expandIndex:Number = Number(expandTarget.text);
data.getItemAt(expandIndex).selected = true;
myList.invalidateDisplayList();
myList.ensureIndexIsVisible(expandIndex);
myList.validateNow();
}
List itemRenderer:
<s:CheckBox id="eventName"
label="{data.eventName}"
top="0" left="0" right="0" bottom="0"
skinClass="skins.SatelliteEventSkin"
selected="{data.selected}"
click="{data.selected = !data.selected}"/>
<s:VGroup includeInLayout="{eventName.selected}"
visible="{eventName.selected}"
top="30" left="10" right="10" bottom="10">
<s:HGroup verticalAlign="middle" width="100%" >
<s:Spacer width="100%"/>
<s:Label text="eventID"/>
<s:Label id="eventID"
width="150"
text="{data.eventID}"/>
</s:HGroup>
etc...
Try to set selectedIndex value or just scroll your List using verticalScrollPosition value -myList.layout.verticalScrollPosition += your_item_height;.
I seem to have a problem of items not being created as expected, resulting in event-listeners not being fired.
I am using a DataGrid column of checkboxes as seen here:
<mx:DataGrid id="gridComponents" height="100%">
<mx:columns>
<fwctrl:DataGridCheckBoxColumn id="colChkBox" width="20" selectionChanged="onGridChbBoxChange(event)" />
<mx:DataGridColumn headerText="Components" dataField="name" width="250"/>
</mx:columns>
</mx:DataGrid>
(fwctrl is the namespace of an internal library.)
And here is what the mxml of fwctrl:DataGridCheckBoxColumn looks like:
<mx:DataGridColumn xmlns:mx="http://www.adobe.com/2006/mxml" resizable="false" xmlns:grid="fwctrl.grid.*" xmlns:CheckBoxColumn="fwctrl.grid.CheckBoxColumn.*">
<mx:Metadata>
[Event(name="selectionChanged", type="fwctrl.grid.CheckBoxColumn.DataColumnCheckBoxEvent")]
</mx:Metadata>
<mx:Script>
<![CDATA[
...
]]>
</mx:Script>
<mx:headerRenderer>
<mx:Component>
<CheckBoxColumn:CheckBoxHeaderRenderer textAlign="center" click="checkboxheaderrenderer1_clickHandler(event)">
<mx:Script>
...
</mx:Script>
</CheckBoxColumn:CheckBoxHeaderRenderer>
</mx:Component>
</mx:headerRenderer>
<mx:itemRenderer>
<mx:Component>
<mx:Box horizontalAlign="center"
verticalAlign="middle" enabled="{outerDocument.isEnabled}">
<mx:Script>
<![CDATA[
...
protected function checkBox_initializeHandler(event:FlexEvent):void
{
trace("init checkbox");
}
]]>
</mx:Script>
<mx:CheckBox id="checkBox" click="onCheckBoxClick()" change="onChange(event)" initialize="checkBox_initializeHandler(event)"/>
</mx:Box>
</mx:Component>
</mx:itemRenderer>
CheckBoxHeaderRenderer is a class that inherits from checkbox.
using the mxml above I bind an ArrayCollection to the data provide by doing: gridComponents.dataProvider = coll;
Having the checkBox_initializeHandler event bound, I expect to see a message printed for each element in my collection.
In reality, the message will only be displayed for element that don't "fall off the grid", i.e. if there is a scroll bar (due to a lot of items being rendered), the items that are below the bottom of the grid (i.e. the ones that need to be scrolled to) will not print a message.
This also means that they are not created correctly and that the click="onCheckBoxClick()" is not hooked correctly and that onCheckBoxClick() does not get triggered.
Why is this happening and how can I fix this?
In Flex, itemRenderers aren't created on a one-to-one basis with your underlying data collection. You only get enough instances to display one screen's worth of data, and those instances get reused as you scroll.
To handle this in your code, refactor so that your click handler in the itemRenderer updates a property in your dataCollection (e.g. data.foo = true;).
<fx:Script>
<![CDATA[
protected function button1_clickHandler(event:MouseEvent):void
{
if (cbAlwaysOnTop.selected) { // <<<<<< I get the error #1009 here
} else {
}
}
]]>
</fx:Script>
<mx:TabNavigator x="0" y="0" width="100%" height="100%">
<s:NavigatorContent label="Translate" width="100%" height="100%">
<s:Button label="test" click="button1_clickHandler(event)"/>
</s:NavigatorContent>
<s:NavigatorContent label="Settings" width="100%" height="100%">
<s:CheckBox x="10" y="22" label="always on top" selected="true" click="checkbox1_clickHandler(event)" id="cbAlwaysOnTop"/>
</s:NavigatorContent>
</mx:TabNavigator>
When I press the button I get the error:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
What am I doing wrong?
It works if I first switch to the 2nd tabpage and then back and press the button.
You are probably in the wrong context and not have a reference to cbAlwaysOnTop.
Where is your button and where do you have the handling code?
Edit: ah, with your comment on the bottom I think I know what's going on, seems that NavigatorContent is only creating its contents when you navigate there, so if you try to access the CheckBox inside without first opening the tab, it hasn't been created and throwing you a null reference error.
Since I guess you want the settings to persist, the solution would be to create a PresentationModel class and bind the CheckBox value, so you can both save it between sessions and retrieve without relying on a UI element. Read this great article to understand what you need to do: http://riarockstars.com/2011/03/16/presentation-model-and-multiple-screens-part-1/
Ok, I found an easy solution to this using:
creationPolicy="all"
Using this in:
<mx:TabNavigator id="x1" x="0" y="0" width="100%" height="100%" creationPolicy="all">
would solve the problem.
I have a ViewStack with 2 panels:
<mx:ViewStack id="viewstack1" height="243">
<mx:Panel id="gridPanel">
<mx:DataGrid id="grid" right="10" left="10" top="10" bottom="10" width="300" height="150" itemClick="showDetails(event)">
<mx:columns>
<mx:DataGridColumn headerText="ID" dataField="Id"/>
<mx:DataGridColumn headerText="Summary" dataField="Summary"/>
</mx:columns>
</mx:DataGrid>
</mx:Panel>
<mx:Panel id="detailsPanel">
<mx:HBox width="100%" height="100%">
<mx:VBox height="100%" width="228" id="detailsVbox">
<mx:Label text="Label" id="itemTitle"/>
<mx:Text text="Text" id="itemSummary"/>
<mx:DataGrid height="97">
<mx:columns>
<mx:DataGridColumn headerText="Property" dataField="col1"/>
<mx:DataGridColumn headerText="Value" dataField="col2"/>
</mx:columns>
</mx:DataGrid>
</mx:VBox>
<mx:Image source="images/BackButton.png" width="50" height="50" click="viewstack1.selectedChild = gridPanel"/>
</mx:HBox>
</mx:Panel>
</mx:ViewStack>
I want to have the user click a grid item in the first panel and then load the data in a panel in the second panel. I can grab the value of the index for the clicked item in the itemClicked handler, but how do I access the detailsPanel to set the values based on the row info from the Grid?
I'm not sure if this is what you want, but you can do something like this:
private function showDetails(event:ListEvent):void {
itemTitle.text = event.itemRenderer.data.Id;
itemSummary.text = event.itemRenderer.data.Summary;
//assuming that the datagrid ID from the details panel is: detailsDatagrid
detailsDatagrid.dataProvider = event.itemRenderer.data.Properties;
viewstack1.selectedChild = detailsPanel;
}
In order for this to work you will also have to add a creation policy to the viewstack.
<mx:ViewStack id="viewstack1" height="243" creationPolicy="all">
This way all panels are going to be created when the viewstack is created (by default they are created only when they are needed). This ensures that you will have a reference the detailsPanel, itemTitle, itemSummary, etc... before the panel is visible.
As for me the best way is to use data binding. Just introduce additional field
[Bindable]
private var detailsDataProvider:ArrayCollection;
And fill it with details in showDetails method. If details data need to be obtained asynchronously (from server, for example) you can reset current details value until data received:
detailsDataProvider = null;
And then populate it with server data.
The final changes are in details data grid:
<mx:DataGrid height="97" dataProvider="{detailsDataProvider}">
Hope it helps.
Here this code will explain 'stackview' simple example. Using this can call panel as same.