I have a list box which is populated via migrating items from another list box. I have 2 asp.net buttons namely Up and Down to scroll up and down through the list box.
The maximum number of items visible at a time in the list box is 9, while the maximum number of items are 21. Hence a scrollbar comes eventually. Its pretty evident and ok.
Now if I select the 21st item and click on Up button, the 21st item moves to one place above, but the list shows items from the first. I mean to say that the list is rearranged, and the client has to explicitly scroll down the list box to view the 21st item which has been moved above.
I want that if I select an item and click the Up button, view of the list box should be there itself, it shouldn't show the list box from the very first item.
Any help would be appreciated.
Below is my code:
protected void btnThird_Click(object sender, EventArgs e)
{
if (lstBoxSelectedColumns.SelectedIndex == 0)
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "alertScrollUp", "alertMessage('Please select other item to scroll up or click the Down navigation button');", true);
}
else if (lstBoxSelectedColumns.SelectedIndex > 0)
{
for (int i = 0; i < lstBoxSelectedColumns.Items.Count; i++)
{
if (lstBoxSelectedColumns.Items[i].Selected)
{
if (i > 0 && !lstBoxSelectedColumns.Items[i - 1].Selected)
{
ListItem belowItem = lstBoxSelectedColumns.Items[i];
lstBoxSelectedColumns.Items.Remove(belowItem);
lstBoxSelectedColumns.Items.Insert(i-1, belowItem);
lstBoxSelectedColumns.Items[i - 1].Selected = true;
}
}
}
}
else
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "alertSelectAtleastOneItem2", "alertMessage('Please select at least one item to scroll above');", true);
}
}
Regards
Anurag
Related
I'm sorry for mistake I'm french.
So I have a tableView empty. I have a button "Add" when on click added row in a tableView. And when I select an row in my tableView, a new button "Cancel" show.
And when I click on a button "Cancel", the row's css change on my row selected (added a class css ".cancel").
The problem is that I click on button "Cancel", and after I click in the button "Add", the css ".cancel" is applicated at an other row while I don't clicked in the button "Add".
I think that there is a problem in index row.
In my method initialize :
articleTable.setRowFactory(param -> new TableRow<LigneTicket>() {
#Override
protected void updateItem(LigneTicket paramT, boolean empty) {
super.updateItem(paramT, empty);
if (!isEmpty() && paramT != null && paramT.getArticle().isArticleCanceled()) {
getStyleClass().add("cancel");
}
}
});
my code on button "Cancel" :
public void cancelLigneTicket() {
int indexSelected = articleTable.getSelectionModel().getSelectedIndex();
articleTable.getItems().get(indexSelected).getArticle().setArticleAnnuler(true);
articleTable.getSelectionModel().clearSelection();
List<LigneTicket> items = new ArrayList<>(articleTable.getItems());
articleTable.getItems().setAll(items);
buttonAnnulArt.setVisible(false);
Help !!
Thanks.
TableRows are used to display the table items. That doesn't mean however, that it will be used with only one item.
This can result in the following sequence of events for a row r:
The item of r is updated to a canceled item and thus the cancel CSS class is added.
The item of r is updated to a non-canceled item, but the cancel CSS class is not removed.
You need to remove the class again. Furthermore with your code the style class could be added multiple times leading to unnecessary memory consumption.
boolean canceled = !empty && paramT != null && paramT.getArticle().isArticleCanceled());
if (canceled) {
if (!getStyleClass().contains("cancel"))
getStyleClass().add("cancel");
} else {
getStyleClass().remove("cancel");
}
or using PseudoClass:
private static final PseudoClass CANCELED = PseudoClass.getPseudoClass("cancel");
...
pseudoClassStateChanged(CANCELED, !empty && paramT != null && paramT.getArticle().isArticleCanceled());
Furthermore you should prefer the TableView.refresh (available in JavaFX >= 8u60) method to refresh the cell items instead of copying the list and setting the items.
I'm working in flex and I made a custom drop down where there are check boxes to allow the user to select multiple options. I used this template.
However this does not have scrolling because if you allow scrolling for some reason the checkboxes start to mess up. For instance if you have options 1 to 8 and only 1 to 5 are shown. You select option 1 and then scroll down to select option 7. When you scroll up the checkboxes start to switch around like option 3 all of a sudden is showing selected. Keep scrolling up and down and the checkbox selection just changes on it's own. I think this is a rendering issue and the actual selection data isn't changed at all (it knows only option 1 and option 7 were selected). Any ideas on how to fix this?
public function onOpen(event:DropDownEvent):void
{//load the checkboxes and set the mouse tracker
activateAllCheckBoxes();
this.scroller.verticalScrollBar.addEventListener(Event.CHANGE, list_verticalScrollBar_change);
callLater(observeMouse);
}
private function list_verticalScrollBar_change(evt:Event):void
{
//currentlySelectedCheckBoxes = selectedCheckboxes;
UpdateCheckBoxesWhenScrolling();
selectedIndex = -1;
}
protected function UpdateCheckBoxesWhenScrolling():void
{
for (var c:int = 0; c < dataGroup.numElements; c++) {
var obj:DropDownCheckBox = dataGroup.getElementAt(c) as DropDownCheckBox;
if(obj!=null)
{
var judgDebtorFromCheckBox:JudgDebtor = (obj.data) as JudgDebtor;
if(FindInCurrentList(judgDebtorFromCheckBox.JudgmentDebtorId)>0)
{
obj.checkbox.selected = true;
}
else
{
obj.checkbox.selected = false;
}
}
}
}
private function FindInCurrentList(ID:int):int
{
for(var i:int=0;i<currentlySelectedCheckBoxes.length;i++)
{
var JD:JudgDebtor = currentlySelectedCheckBoxes.getItemAt(i) as JudgDebtor;
if(JD.JudgmentDebtorId == ID)
return 1;
}
return -1;
}
So above code I register a scroll event listener on the drop down. It will update the drop down entries which has a check box and it uses an array collection called: currentlySelectedCheckBoxes. I debug the UpdateCheckBoxesWhenScrolling function and it's working fine, in other words it will check off the ones selected but for some reason it still is showing the wrong results for instance 11 entries in the list and only the second one is selected I scroll down and I can't see the the second entry but all of a sudden the last entry is showing that it's checked off.
This happens because the drop down list reuses the renderers when you scroll. For example if you have checked 1st item and scroll, the renderer for that is reused to display the item that becomes visible when you scroll. So the last item shows as checked. To avoid messing up the selection, you will have to do the following in the renderer that you are using
override public function set data(value:Object):void
{
super.data = value;
//inspect the property which indicates whether to select the checkbox or not
//and set the value of selected property accordingly
}
Hope this helps
Here is what a portion of my screen looks like:
The user can pick a choice from the drop-down list and click the add button. Here is the code for the add button:
protected void btnModuleAdd_Click(object sender, EventArgs e)
{
var selectedModule = ddlModsList.SelectedItem.ToString();
var graphicName = this.GraphicName;
var xr = new GraphicModuleXRef();
xr.GraphicName = graphicName;
xr.Module = selectedModule;
// Take drop down list selection and add it to GraphicModuleXRef table.
var context = new XRefDataContext();
context.GraphicModuleXRefs.InsertOnSubmit(xr);
context.SubmitChanges();
}
Basically, it's taking the user's choice and writing it out to a table. This part works fine.
In my Page_Load, I check whether IsPostback and, if it is, I run the code below:
private void LoadOtherModulesUsed()
{
if (this.GraphicName != null)
{
lbModules.Items.Clear();
var context = new XRefDataContext();
var q = context.GraphicModuleXRefs
.Where(a => a.GraphicName.Contains(this.GraphicName));
foreach (GraphicModuleXRef gr in q)
{
lbModules.Items.Add(new ListItem(gr.Module.ToString()));
}
}
}
This code reads from a table, finds all records that match the criteria, and adds them to the listbox.
So, what I'm expecting to happen is for the page to reload and the listbox to be repopulated, including the new entry just added to the table. But, that isn't happening. The screen refreshes like it has reloaded, but the entry doesn't appear in the listbox. However, it IS there, it just can't be seen. If the user adds another entry, by clicking the Add button, the list 'rolls up' one row and the previous entry can be seen. But, not the new one. If the user exits from the screen and re-enters, all the entries in the listbox can be seen. It's almost like the listbox is too short to display all records, but I've tried different heights, with no difference.
I'm wondering if anyone can point me in the right direction?
Put simply, when adding a new item to the listbox, it isn't immediately visible unless another item is added, thereby 'rolling' the list up. Even scrolling the list with the scrollbar doesn't show the new entry until another entry is added. And, if you scroll the list up, you can see the prior entry. So strange!
EDIT: Trying to describe this more simply:
User adds item to listbox by pressing Add button.
New item does not appear in listbox.
User adds another item to listbox by press Add button.
Prior item now shows in listbox if user scrolls listbox up.
The newest item just added, however, does not appear unless step 3 is repeated.
Also, exiting the page and then coming back in loads every item in the list and all is visible.
This is a timing issue. Whats happening is Page_Load runs first in this case and THEN the Click event handler so effectively the control has been bound before the new entry is added. Thats why you're always one refresh behind. Id refactor your code like this so everything runs in the correct order! To understand the timing of event execution I strongly recommend reading this article on MSDN its AWESOME and will really help you get the best from ASP.NET.
Additionally reading this article on MSDN (Also awesome) especially the section on ViewState will explain how the DropDown retains its details even when, in the modified code, you're onlly filling it when the page is NOT a postback and when the click event is fired.
Hope this helps!
public void Page_Load(object sender, EventArgs e)
{
if (IsPostBack) return;
LoadOtherModulesUsed();
}
private void LoadOtherModulesUsed()
{
if (this.GraphicName != null)
{
lbModules.Items.Clear();
var context = new XRefDataContext();
var q = context.GraphicModuleXRefs
.Where(a => a.GraphicName.Contains(this.GraphicName));
foreach (GraphicModuleXRef gr in q)
{
lbModules.Items.Add(new ListItem(gr.Module.ToString()));
}
}
}
protected void btnModuleAdd_Click(object sender, EventArgs e)
{
var selectedModule = ddlModsList.SelectedItem.ToString();
var graphicName = this.GraphicName;
var xr = new GraphicModuleXRef();
xr.GraphicName = graphicName;
xr.Module = selectedModule;
// Take drop down list selection and add it to GraphicModuleXRef table.
var context = new XRefDataContext();
context.GraphicModuleXRefs.InsertOnSubmit(xr);
context.SubmitChanges();
LoadOtherModulesUsed();
}
I have a . I provide arraylist as its data provider. my question is why moves to the ing location in when I select any item using enter key. Also when I press space from keyboard, again moves to ing location. How can I fix this? Thanks
protected function onInputKeyDown(e:KeyboardEvent):void
{
if(e.keyCode == 13)
{
AddPath(cb.textInput.text);
cb.dataProvider = recentList;
}
}
here recentList is a Bindable ArrayList. Every Time when I enter anything in ComboBox and press Enter, The cursor moves to the beginning in the Text Area of ComboBox. AddPath function simply adds the new data to the recentList.
When you set cb.dataProvider = recentList; you are essentially assigning a new pointer which overrides the previous list and resets the cursor.
You should be able to create a variable containing the selected item and manually set the ComboBox to that item on click/enter after you carry out the cb.dataProvider = recentList;
protected function onInputKeyDown(e:KeyboardEvent):void
{
if(e.keyCode == 13)
{
var selectedItem:String = cb.selectedItem
AddPath(cb.textInput.text);
cb.dataProvider = recentList;
cb.selectedItem(selectedItem);
}
}
Apologies if the code isn't perfect, but the theory should be right.
I have a Datagrid filled with a table. Now the vertical scrollbar shows up because the table doesn't fit. That's fine so far. Now in the last column I have defined a Button in the xaml file. All these buttons have the same callback, but I can distinguish from the selectedIndex of the table what this callback should do. Because clicking the button automatically also selects the line in the DataGrid where this button lives. That's fine so far. Now in my app, for some rows I want to disable the Button, because it has no meaning for that specific row. So what I did is take a subscription on event Load of each Button and let the callback set the MaxWidth = 0, if the button has no meaning. This works fine too, but only initially. As soon as I start dragging the scrollbar, at random places in the Button column buttons show up, or wrong buttons get MaxWidth = 0. I have the strong feeling that cells that scrolled out at the top are being reused at the bottom, but I don't get an event, or at least I don't know which event I should subscribe on. I don't know how to identify the scrollbar. Has anyone a suggestion to tackle this problem?
I finally found a solution to this problem myself, and I will post it for the record.
The event you should subscribe on is LoadingRow (generated by the DataGrid).
In the callback
void TableLoadingRow(object sender, DataGridRowEventArgs e)
you can identify an element in a cell by using VisualTreeHelper for instance as follows:
private void ButtonSetMaxWidth(DependencyObject reference, int maxWidth)
{
if (reference != null)
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(reference); i++)
{
var child = VisualTreeHelper.GetChild(reference, i);
if (child.GetType() == typeof(Button))
{
Button b = (Button)child;
if (b.Name == "TheNameOfTheButtonInTheXAML")
{
b.MaxWidth = maxWidth;
return;
}
}
ButtonSetMaxWidth(child, maxWidth);
}
}
return;
}