I am very new to javaFX technology. I have created one tableview which is having multiple columns. Now I have a requirement where I need to replace all the values in one of the column with one new value. How to achive this in javaFX. The new value which will replace all the values in that table coloumn is coming from one pop up.
Just set the appropriate property for each item in the table:
table.getItems().forEach(item -> item.someProperty().set(someValue));
where someProperty() is the property accessor method for the property in the column of interest, and someValue is the value you're setting it to.
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Event after updating the data model javafx treetableview cell value not getting updated.
I am using the sample code here # http://docs.oracle.com/javase/8/javafx/user-interface-tutorial/tree-table-view.htm
(Example 15-2)
On click of button i m trying to update first item: employees.get(0).setName("Test");
Is there any trick using which treetableview can be updated?
The example, somewhat strangely, returns a ReadOnlyStringWrapper wrapping the property values for the cell value factories. Thus instead of binding the value displayed in the column directly to the properties in the Employee class, it binds them to a new, read-only, property wrapping the value retrieved when updateItem(..) is called on the cell. This means it won't get updated when the underlying data is updated, but only if the updateItem(...) method is invoked on the cell. (I have no idea why they would do this.) So you should find, for example, that if you change the value, then collapse the root node in the TreeTableView and expand it again, that your new value is displayed after expanding the root (because this causes the cells' updateItem(...) methods to be invoked).
To make the cells update when the data is changed, bind the cell value directly to the property defined in the model (Employee) class:
empColumn.setCellValueFactory( param -> param.getValue().getValue().nameProperty());
and
emailColumn.setCellValueFactory( param -> param.getValue().getValue().emailProperty());
my application needs to allow users to insert rows below the current datagrid row. My solution is to to add a row to the dataproviders collection. This works, but the row does not appear beneath the current row the user clicked on.
The Datagrid has a default sort order (date ASC), which re-orders the data...so this seems to affect the position of the row in the grid.
Any ideas how to fix this?
Two possible answers:
1. define your own sort function that sorts according to item order in dataprovider (i.e. it does nothing), and assign it to the sortFunction property
2. simply comment out the sorting of the data inside the component.
I have Flex 4 DataGrid, what I would like to do is when an cell has been edited,
I would then like to walk through the values of that column and preform math on the values, eg I want to total up certain values.
1) How do I reference individual values of a specific column so that I may set them.
2) How do I then set those values or should I create a new column array and pop it in place of that column.
Please and thank you in Advance.
Craig
var data_field:String = dgViewPreview.columns[6].dataField; //for 6th column
ListCollectionView(dataGrid.dataProvider).getItemAt(requiredRow)[data_field] = newValue;
Thanks to Armagosh for the idea.
You can also listen to CollectionChangeEvent of your dataProvider, check its type, and if this is a PropertyChangeEvent that triggered it - check the name of the property that was changed, and depending on the property perform the calculations. This will work if you change the value not only from dataGrid. And, you would want the calculated values to be marked [Bindable] to have the changes reflected in the UI.
A way to do it in Flex 3 would be to add an event listener on the grid for the ItemEditEnd event. In the handler of that event, you would iterate over your the dataprovider and perform and calculations and updates needed.
When you update the items in your dataprovider, the updated values will be reflected in your grid.
I imagine you would do something similar in Flex 4.
--ron
In Flex 4 using a pre populated data grid, how can I get or set specific values programatically, IE I wont be using selectedItems etc.
How do I reference the value of a cell in row 4 colum 6 for example.
Please and thank you in advance for your help.
Craig
Cast the dataProvider of the DataGrid to ListCollectionView and use its getItemAt method.
ListCollectionView(dataGrid.dataProvider).getItemAt(requiredRow).appropriateProperty = newValue;
Update: In case the column name is dynamic, you can fetch it using something like:
var data_field:String = dgViewPreview.columns[6].dataField; //for 6th column
ListCollectionView(dataGrid.dataProvider).getItemAt(requiredRow)[data_field] = newValue;
There are two ways to access, based on Grid column DataField Mapping to object property or LabelFunction set to grid column
I pasted the scenario with example here
http://pastebin.com/iwrnHD1c
Is it possible to dynamically show row index for DataGrid rows ?
I have a static ArrayCollection which is set to be DataGrid's data provider and I would like to always have row numbering for each populated row (e.g. in a column called "#").
Thanks!
Yes, create a labelFunction that returns the ArrayCollction's getItemIndex for the current object, plus 1. Example