Tag Archives: CheckBox

[RESOLVED] How to determine if all checkboxes are checked in code behind

I have a page that im using javascript to do a select all / unselect all for my checkboxes on the page.
Now i need to determine in the code behind if all of them are checked, im wondering if it would be easier to just set a session or something when
the select all is checked, but that wouldnt be accurate, because after you select all, you still can uncheck some..

So i need it to check at the time the button is clicked.. there are currectly 30 checkboxes, NOT a checkboxlist.

I tried using the site search but getting an error has occured when i click to search...

Can anyone help?

Assuming you're using <asp:CheckBox> controls, and that you aren't doing this inside something like a DataGrid, the following VB should work.

Dim MyCheckBoxIsChecked as Boolean = MyCheckBoxId.Checked

Of course, you would have to do that for each checkbox.

Or you could create a gigantic If claus that AND'ed them all together:

If MyCheckBoxId01.Checked And MyCheckBoxId02.Checked And MyCheckBoxId03.Checked And MyCheckBoxId04.Checked ... Then

i was hoping for something with less code.. the javascript i have is 3 lines and handles all the checkboxes.. could there be something to convert the javascript i have to C#?

cubangt

the javascript i have is 3 lines and handles all the checkboxes
[Hmm, that couldn't be jQuery, could it?]

JavaScript and C# function in different environments and work with different object hierarchies.  AFAIK, there is no translation.

In my experience, my time is better spend using copy/paste to generate 30 lines of dumb, repetitive code than it would be debugging a clever routine that attempts to scan all the controls on a page and determine programmatically whether or not it's one that I'm looking for.  (YMMV)

I dont mind doing 30 lines.. figured i'd check if there was something better / different to do the same thing in C#

went ahead and did it with all 30 checkboxes.

 

thanks

you just need a function to walk the control hierarchy which you can pass the test to.

public void ControlWalker(Control ctl, Action<Control> action)  {
        action(ctl);
        foreach (Control child in ctl.Controls)
            ControlWalker(child, action);
 }
....

bool allChecked = true;
ControlWalker(Page, ctl => {
       if (ctl is ICheckBoxControl)
              allChecked = allChecked & ((ICheckBoxControl)ctl).Checked;
});

//or if you don't want to predefine a function:

bool allChecked = true;
Action<Control> walk = null; //hack to allow recursion
walk = (ctl => {
      if (ctl is ICheckBoxControl)
            allChecked = allChecked & ((ICheckBoxControl)ctl).Checked;
      foreach (Control child in ctl.Controls)
             walk(child);
});

 

[RESOLVED] Issue with displaying check box list values in a label or some other web control

I have trouble displaying the values of what options the user checked in a checkboxlist on a aspx page..... I am trying to do this programmatically through VB coding....This is what I have so far below in my code, but it just replaces the last value checked from the checkbox list.... I want it to display all the values checked onto one label....

 

If its not possible to display all the values of the checked values onto a label, what other web controls can I use to accomplish this...

Here is my code.....

 lblProLanguageInput.Text = " "

        If ProLanguages.Items(0).Selected Then

            lblProLanguageInput.Text = ProLanguages.Items(0).Text & "</br>"

        ElseIf ProLanguages.Items(1).Selected Then

            lblProLanguageInput.Text = ProLanguages.Items(1).Text & "</br>"

        ElseIf ProLanguages.Items(2).Selected Then

            lblProLanguageInput.Text = ProLanguages.Items(2).Text & "</br>"

        ElseIf ProLanguages.Items(3).Selected Then

            lblProLanguageInput.Text = ProLanguages.Items(3).Text & "</br>"

        End If

<div></div>

For every item that's checked, you're overwriting the value in the label.  instead you want to append to it.

So replace this: lblProLanguageInput.Text = ProLanguages.Items(1).Text & "</br>"

with this: lblProLanguageInput.Text = lblProLanguageInput.Text & ProLanguages.Items(1).Text & "</br>"

and do the same for item 2 & 3 as well.  Actually, it's better if you use something like a StringBuilder to build the string, and then at the end you set the .Text property of the label to the value in the stringbuilder.

I just tried to replace the code with what you recommended, but it didnt work....As far as stringbuilder, I am not familiar with using that before and I did some research, but I cannot get it to work.... Frown

Try using a multiline textbox to display the results instead as a test. Also, if you're familiar with debugging, put a breakpoint at the end of the method to check the .Text value and see if you're capturing everything you expect.

I figured it out using a For Each loop to display the checked items....

 

 

lblProLanguageInput.Text =

String

.Empty

 

For Each ListItem In

ProLanguages.Items

 

If (ListItem.selected)

Then

 

 

lblProLanguageInput.Text += ListItem.Text +

 

"<br />"

 

 

End

If

 

Next

Hello, this is a very simple solution to your question:

This is the code:

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click
        Dim i As Byte
        ListBox1.Items.Clear()
        For i = 0 To CheckBoxList1.Items.Count - 1
            If CheckBoxList1.Items(i).Selected Then ListBox1.Items.Add(CheckBoxList1.Items(i).Text)
        Next
    End Sub

And here the html:

 

<body>
    <form id="form1" runat="server">
    <div>
    
        <asp:CheckBoxList ID="CheckBoxList1" runat="server">
            <asp:ListItem>Option1</asp:ListItem>
            <asp:ListItem>Option2</asp:ListItem>
            <asp:ListItem>Option3</asp:ListItem>
            <asp:ListItem>Option4</asp:ListItem>
        </asp:CheckBoxList>
        <br />
        <asp:Button ID="Button1" runat="server" Text="Button" />
        <br />
        <br />
        <asp:ListBox ID="ListBox1" runat="server"></asp:ListBox>
    
    </div>
    </form>
</body>

Hope it helps ;)

 

Checkbox inside nested panel is not cleared

Dear all,

               I have a situation where i have unchecked all checkbox from a panel which havs some nested panels. I am able to clear checkboxes from main panel but nested panel's checkbox remain unchanged. My code is 

Aspx page code

 <asp:Panel ID="pnlMain" runat="server">
            <asp:CheckBox ID="chk1" runat="server" Checked="true" Text="ABC" />
            <br />
            <asp:CheckBox ID="CheckBox1" runat="server" Checked="true" Text="DEF" />
            <br />
            <asp:CheckBox ID="CheckBox2" runat="server" Checked="true" Text="GHI" />
            <br />
            <asp:Panel ID="pnlMain2" runat="server">
                <asp:CheckBox ID="CheckBox3" runat="server" Checked="true" Text="MNO" />
                <br />
                <asp:CheckBox ID="CheckBox4" runat="server" Checked="true" Text="PQR" />
                <br />
                <asp:Panel ID="pnlMain3" runat="server">
                    <asp:CheckBox ID="CheckBox5" runat="server" Checked="true" Text="STU" />
                    <br />
                    <asp:CheckBox ID="CheckBox6" runat="server" Checked="true" Text="VWY" />
                    <br />
                </asp:Panel>
            </asp:Panel>
        </asp:Panel>
        <asp:Button ID="btnClear" runat="server" Text="Clear" OnClick="btnClear_Click" />

 

--- Cs  page  code ---

 protected void btnClear_Click(object sender, EventArgs e)
        {           
            foreach (Control ctl in pnlMain.Controls)  
            {                
                 if (ctl is CheckBox)
                {
                    (ctl as CheckBox).Checked = false;
                }
            }
        }

thanks & regards

Dev

 

 

Add another loop for second panel also. You have to make the loop recursive as you are checking for a specific control type

Add this after the foreach loop.

 protected void btnClear_Click(object sender, EventArgs e)
        {            
            foreach (Control ctl in pnlMain.Controls)   
            {                 
                 if (ctl is CheckBox)
                {
                    (ctl as CheckBox).Checked = false;
                }
            }

            foreach (Control ctl in pnlMain2.Controls)   
            {                 
                 if (ctl is CheckBox)
                {
                    (ctl as CheckBox).Checked = false;
                }
            }
        }

Hi Santosh,

                Situation is that i have to pass main panel name to another class file. The code i wrote show the logic what i am doing. I have tp pass panel name inside a class file which clear all checkboxes inside main panel and nested panel. So, by placing nested pnel name is not working in this case .

 

regards

Dev

 

 

[RESOLVED] Real-time control effect via code behind

Hi

I have two checkboxes on web form chkYes and chkNo. When I click either I want the other one to be un-ticked. I have implemented the following in code behind;

protected void chkNo_CheckedChanged(object sender, EventArgs e)
{
  this.chkYes.Checked = false;
}
 
protected void chkYes_CheckedChanged(object sender, EventArgs e)
{
  this.chkNo.Checked = false;
}

Problem is ticking one tick has no effect on the other. What is the reason and how can I make it work?

Thanks

Regards

you'd need to set the checkbox's autopostback property to true to see the code run as soon as you click.

note - I think that you might want to check to see if the checkbox that is firing its changed event is actually checked before you uncheck the other one..??

keep in mind that doing postbacks can be heavy, so you might also want to consider a client side jQuery solution for mutually exclusive checkboxes.

http://dotnetspidor.blogspot.com/2009/10/jquery-mutually-exclusive-checkboxes-in.html 

Hi, You can use AJAX MutuallyExclusiveCheckBoxExtender without post back of page

see: http://www.asp.net/ajax/tutorials/creating-mutually-exclusive-checkboxes-vb

but best is use radio button list it ment for single select only

also see:

http://stackoverflow.com/questions/1818102/how-to-make-user-select-only-one-check-box-in-a-checkboxlist

 

you can make this one happen on client side itself....there is no need for you to make a round trip to server for this requirement...

make use of javascript....try this...

http://blog.schuager.com/2008/09/mutually-exclusive-checkboxes-with.html

Thanks.