if checkbox is clicked i need to select all items in the listbox in asp.net...
how to show the items all selected in listbox once the 'selectall' checkbox is clicked
In the CheckedChanged event handler of the checkbox, iterate through all the items of the list and set the Selected property for all as true. You also need to make sure that the multi selection is enabled on your listbox. Use the following to do that:
...
for(int i=0;i<ListBox1.Items.Count;i++)
{
ListBox1.Items[i].Selected = true;
}
...
You can use the attribute OnClientClick with your ASP.NET Listbox to fire a javascript function that selects all items.
If your ASP.NET Listbox runs on the server, you should refer it in your Javascript using:
Related
How to modify the items in listbox when it is databound.
suppose i have 1 listbox and 1 combobox.i want to display results in listbox only for the value selected in combobox and remove the other value in listbox in windows form in asp.net.
I think you should add an OnSelectedIndexChanged to your combobox and set AutoPostBack="True"
Then selecting an item should trigger a post back and call the method you set for the OnSelectedIndexChanged. There you can fill the ListBox with values and remove the selected item from the ListBox too.
I'm programming a simple listbox in windows phone 7. The listbox has some items and when I click any of items the app navigates to a new page.
From beginning to here, everything is good.
But I want end-user can select the item again which causes navigate to the next page again. But listbox as it is, doesn't allow me to select an already selected item again.
I tried to do this for allowing to select an item again.
private void ListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if(ListBox.SelectedIndex != -1 )
{
NavigationService.Navigate(uri);
ListBox.SelectedIndex = -1;
}
}
I have alreadhy edited the ListBoxItemTemplate to highlight selected item, but when I use above code, I cannot highlight the selected item, because it changes SelectedIndex too fast.
So how can I allow user to select a selected item or how can I highlight previous selected item. Any suggestions or tips?
EDIT:
When using a normal ListBox , I can simply use :
listboxitem1.Background = new SolidColorBrush(Color.Blue);`
But when I edit template of listbox item this does throw exception, so I cannot still do this.
Look into implementing one of the other Event handlers for Mouse events on the ListBox. Such as the Click Event. You can detect when the user clicks the ListBox without changing the selected index by keeping track of the previous selected index value.
Well, you can edit the template of ListBoxItem and add a grid, fully front of listbox item. And bind the visibility property of this grid.
After this, you can change of the visibility according to selected index. This approach should work well if you're using a navigation with listbox.
Hope it works!
I have a listbox in my winform, when an item in the listbox is selected, a value is placed into a textbox in the same Form. There my many items in my listbox which when selected, i want the text box to be empty so i can pass in the new value. How do i check is if the user has clicked on something other their initial selected item? i get the currently selected item like this below:
var selectedItem = (ReportItems)listbox.selectedItem
You can use the SelectedIndexChanged event on your ListBox . You can create an event handler for this event to determine when the selected index in the ListBox has been changed. This can be useful when you need to display information in other controls based on the current selection in the ListBox. You can use the event handler for this event to load the information in the other controls.
See MSDN documentation: link
You can add a global variable for your ReportItems and call it 'selItem'.
After the user changed the selected Item you check the "new" selectedItem with the 'selItem'-variable.. i don't think that a listbox has a method that can check if the selection has changed from the previous one..
I'm not sure if there is a reason you're not leveraging the SelectionChanged event of the ListBox or not but you should be if you're not. Further, determining if it's different than the initially selected item should be pretty straight forward because you can save the initially selected item in a private variable in your form and compare every time the method handler for SelectionChanged fires.
Other than this, there's not much more I can suggest because your questions isn't terribly clear and there is no code to look at.
My solution was to always clear the textbox first. So as soon as a user selects an item in the listview, rather than populating the textbox straight away, clear the textbox before populating it.
clearText(); is called soon as a listbox item is clicked.
public void clearText()
{
textBox1.Clear();
textBox2.Clear();
textBox3.Clear();
textBox4.Clear();
textBox5.Clear();
textBox6.Clear();
textBox7.Clear();
textBox8.Clear();
textBox9.Clear();
textBox10.Clear();
textBox11.Clear();
textBox12.Clear();
}
How can I retrieve the value of a clicked item in a multi-select listbox?
Currently, if I click one item and use lstBox.SelectedValue, it will return the proper value; however, if I then click on another item, I am still shown the first item's value.
Basically, I want the value of the item most recently clicked on, regardless of whether or not it is the SelectedValue.
If it is a multiple selection listbox, you can get a collection of all the selected items by using SelectedItems instead of SelectedItem.
If you need to know the sequence in which the items were selected, or which was selected most recently, I think you would need to record if yourself by SelectedIndexChanged event.
The SelectedIndexChanged handler will get called when you select/unselect an item in the listbox.
However, it doesn't indicate which one was selected/unselected.
listbox1.SelectedItems
will contain the currently selected items and you could internally keep track of which index was most recently added.
I want to select all the items in listbox. Here iam using listbox1.selectAll() for selecting all items. And for Deselecting all items in a listbox iam using listbox1.selecteditems.clear(). thats working perfectly
Now i want to do validations like if i select all items by using listbox1.selectAll() and then if i select one item in listbox all selected items selection is going off and the radio button still showing the selectall is checked.But i dont have all items selected in a listbox. How to do that. Any suggestion plz.
I would suggest using a single CheckBox or two standard Buttons instead of RadioButtons.
If some but not all or none of the items are selected, which RadioButton will you check? It doesn't make sense to have a "Some selected" RadioButton.
With buttons, you simply select/unselect all of the items when the button is pressed.
With a single CheckBox, you can use the three state feature to set the CheckBox as follows: checked = all selected; third state = some selected; unchecked = none selected.
Handle the appropriate Checked and Unchecked handlers on the CheckBox for updating the ListBox, and respond to the ListBox.SelectionChanged event to update the CheckBox in response to manual selection changes.
You could implement a check in the ListBox1_SelectedIndexChanged event to do a check against the checkbox i.e.
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
myCheckBox.Checked = listBox1.SelectedItems.Count > 1;
}