Hướng Dẫn Asp net listbox multiple selection Chi tiết

Mẹo Hướng dẫn Asp net listbox multiple selection Chi Tiết

Quý khách đang tìm kiếm từ khóa Asp net listbox multiple selection được Update vào lúc : 2022-03-13 15:33:18 . Với phương châm chia sẻ Bí quyết về trong nội dung bài viết một cách Chi Tiết 2022. Nếu sau khi Read tài liệu vẫn ko hiểu thì hoàn toàn có thể lại Comments ở cuối bài để Admin lý giải và hướng dẫn lại nha.

User-68639941 posted
you can use ListBox with SelectionMode=”Multiple
Apples
Grapes
Oranges
Pear
to read the values

int[] indexes = this.lbxfruit.GetSelectedIndices();
for (int index = 0; index < indexes.Length; index++)
items += this.lbxfruit.Items[indexes[index]].Text + ",";

Nội dung chính

public:
virtual property System::Web::UI::WebControls::ListSelectionMode SelectionMode System::Web::UI::WebControls::ListSelectionMode get(); void set(System::Web::UI::WebControls::ListSelectionMode value); ; public virtual System.Web.UI.WebControls.ListSelectionMode SelectionMode get; set; thành viên this.SelectionMode : System.Web.UI.WebControls.ListSelectionMode with get, set Public Overridable Property SelectionMode As ListSelectionMode ListSelectionMode

One of the ListSelectionMode values. The default value is Single.

Examples

The following example illustrates how to use the SelectionMode property to allow the user to select multiple selections from the ListBox control.

void SubmitBtn_Click(Object sender, EventArgs e)

Message.Text = “You chose:
“;

// Iterate through the Items collection of the ListBox and
// display the selected items.
foreach (ListItem item in ListBox1.Items)

if(item.Selected)

Message.Text += item.Text + “
“;

ListBox Example

Select items from the list and click Submit.

Item 1
Item 2
Item 3
Item 4
Item 5
Item 6

Sub SubmitBtn_Click(sender As Object, e As EventArgs)

Message.Text = “You chose:
”

‘ Iterate through the Items collection of the ListBox and
‘ display the selected items.
Dim item As ListItem
For Each item in ListBox1.Items

If item.Selected Then

Message.Text &= item.Text & “
”

End If

Next

End Sub

ListBox Example

Select items from the list and click Submit.

Item 1
Item 2
Item 3
Item 4
Item 5
Item 6

Remarks

Use the SelectionMode property to specify the mode behavior of the ListBox control. Setting this property to ListSelectionMode.Single indicates only a single item can be selected from the ListBox control, while ListSelectionMode.Multiple specifies multiple items can be selected.

The value of the SelectionMode property is stored in view state.

Applies to

ListSelectionMode
ListBox Web Server Control Overview

asp listbox get multiple selected items

The following asp c# example code demonstrate us how can we get ListBox control’s selected items
programmatically when ListBox selection mode is multiple. ListBox control ‘SelectionMode’ property have two possible values ‘Multiple’ and ‘Single’. Multiple mode allow us to select
more than one items from ListBox control. When users select items from ListBox which SelectionMode is Multiple, then it is more
complicated to get the selected items programmatically run time.

We can get ListBox selected items on ListBox SelectedIndexChanged sự kiện or manually by a Button click without AutoPostBack.
To get the ListBox selected items, first we perform a Linq query to get the ListBox items which
ListItem object’s ‘Selected’ property value is ‘true’. Then we loop through the selected items collection and display on web browser
with items text and value..

listbox-get-multiple-selected-items.aspx

protected void Page_Load(object sender, EventArgs e)

if(!Page.IsPostBack)

//auto height of listbox to remove vertical scrollbar
ListBox1.Rows = ListBox1.Items.Count;

protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)

//linq query to get all selected items from listbox
var items = from ListItem li in ListBox1.Items
where li.Selected == true
select li;

Label1.Text = “you selected….
“;
//loop through selected items in listbox
foreach(ListItem li in items)

//selected item text and value.
Label1.Text +=li.Text + ”

I can’t find a way to select multiple items in an ASP.NET ListBox in the code behind? Is this something needs to be done in Javascript?

://.youtube/watch?v=tYUbwEsX93Y

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