C# – Make two checkbox lists mutually exclusive

asp.netccheckboxcheckboxlist

Good day friends,

I got to know how we can make two checkboxes or checkboxes inside a checkbox list mutually exclusive.
However my question is little different from that, Hope to get some help from stack overflow,

Well I have two checkbox lists, as follows and from a dataset table I am getting the check box values,

CheckBoxlist1 – Checkbox_selectColumns

 if (IsDataSetNotEmpty(ds))
 {
   CheckBox_selectColumns.Items.Clear();
   foreach (DataRow row in ds.Tables[0].Rows)
   {
     CheckBox_selectColumns.Items.Add(row[0].ToString());
   }

 }

CheckBoxlist2 – Checkbox_selectFields

if (IsDataSetNotEmpty(ds))
{
  Checkbox_selectFields.Items.Clear();
  foreach (DataRow row in ds.Tables[1].Rows)
  {
    CheckBox_selectColumns.Items.Add(row[0].ToString());
  }

}

I will get following checkboxes in each lists.

Checkbox_selectColumns : Employee ID, First Name, Last Name

Checkbox_selectFields : manager ID, Manager FName, Manager LName

Is there any way , I can make these two checkboxes mutually exclusive, That is if I select any one or more checkbox from first list, I should not select any checkboxes from second list and vice versa..

Thank you…

Best Answer

Rather than loop through the items in the CheckBox, I'd suggest using the SelectedValue property of the control, as that persists through postbacks (SelectedIndex does not) (ListControl.SelectedValue Property):

protected void CheckBox_selectColumns_SelectedIndexChanged(object sender, EventArgs e)         
{             

    if (CheckBox_selectColumns.SelectedValue != "")
    {
        foreach (ListItem listItem in CheckBox_SelectAll.Items)
        {
            listItem.Selected = false;
        }
    }
}

protected void CheckBox_SelectAll_CheckChanged(object sender, EventArgs e)
{

    if (CheckBox_SelectAll.SelectedValue != "")
    {
        foreach (ListItem listItem in CheckBox_selectColumns.Items)
        {
            listItem.Selected = false;
        }
    }
}

Modern jQuery

Use .prop():

$('.myCheckbox').prop('checked', true);
$('.myCheckbox').prop('checked', false);

DOM API

If you're working with just one element, you can always just access the underlying HTMLInputElement and modify its .checked property:

$('.myCheckbox')[0].checked = true;
$('.myCheckbox')[0].checked = false;

The benefit to using the .prop() and .attr() methods instead of this is that they will operate on all matched elements.

jQuery 1.5.x and below

The .prop() method is not available, so you need to use .attr().

$('.myCheckbox').attr('checked', true);
$('.myCheckbox').attr('checked', false);

Note that this is the approach used by jQuery's unit tests prior to version 1.6 and is preferable to using $('.myCheckbox').removeAttr('checked'); since the latter will, if the box was initially checked, change the behaviour of a call to .reset() on any form that contains it – a subtle but probably unwelcome behaviour change.

For more context, some incomplete discussion of the changes to the handling of the checked attribute/property in the transition from 1.5.x to 1.6 can be found in the version 1.6 release notes and the Attributes vs. Properties section of the .prop() documentation.

C# – What do two question marks together mean in C#

It's the null coalescing operator, and quite like the ternary (immediate-if) operator. See also ?? Operator - MSDN.

FormsAuth = formsAuth ?? new FormsAuthenticationWrapper();

expands to:

FormsAuth = formsAuth != null ? formsAuth : new FormsAuthenticationWrapper();

which further expands to:

if(formsAuth != null)
    FormsAuth = formsAuth;
else
    FormsAuth = new FormsAuthenticationWrapper();

In English, it means "If whatever is to the left is not null, use that, otherwise use what's to the right."

Note that you can use any number of these in sequence. The following statement will assign the first non-null Answer# to Answer (if all Answers are null then the Answer is null):

string Answer = Answer1 ?? Answer2 ?? Answer3 ?? Answer4;

Also it's worth mentioning while the expansion above is conceptually equivalent, the result of each expression is only evaluated once. This is important if for example an expression is a method call with side effects. (Credit to @Joey for pointing this out.)

Best Answer

Related Solutions

Javascript – Setting “checked” for a checkbox with jQuery

Modern jQuery

DOM API

jQuery 1.5.x and below

C# – What do two question marks together mean in C#

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