Treegrid Row Filter

When we apply filters in treegrid, Row property is set to true. Let’s say we have 100 records of VA and DC equally distributed 50/50. If we don’t apply any filter then Row Visible property of all records is true.

If we apply VA filter then 50 records row visible property will be true and remining 50 will be false.

The twist is hidden rows. Let’s say we have 2 DC records selected. We apply VA filter then row visible property of 52 records will be selected. To get a clean picture we need to reset DC hidden rows.

For custom implementation OnAfterValueChanged Event. This is a generic event and can be used for anything (cells, rows etc).

Here is a sample code snippt;

$.each(grd.Rows, function (index, row) {
   if (row.Visible == true) {
     grd.SetValue(rw, 'Select', val, true);


UBUNTU disk size increase

To increase disk size, first we need to see disk status;

df -h

If it’s a VM, make sure VM has allocated enough space before performing next actions.

Here’s the list of steps for a simple scenario where you have two partitions, /dev/sda1 is an ext4 partition the OS is booted from and /dev/sdb2 is swap. For this exercise we want to remove the swap partition an extend /dev/sda1 to the whole disk.

  1. As always, make sure you have a backup of your data – since we’re going to modify the partition table there’s a chance to lose all your data if you make a typo, for example.
  2. Run sudo fdisk /dev/sda
    • use p to list the partitions. Make note of the start cylinder of /dev/sda1
    • use d to delete first the swap partition (2) and then the /dev/sda1 partition. This is very scary but is actually harmless as the data is not written to the disk until you write the changes to the disk.
    • use n to create a new primary partition. Make sure its start cylinder is exactly the same as the old /dev/sda1 used to have. For the end cylinder agree with the default choice, which is to make the partition to span the whole disk.
    • use a to toggle the bootable flag on the new /dev/sda1
    • review your changes, make a deep breath and use w to write the new partition table to disk. You’ll get a message telling that the kernel couldn’t re-read the partition table because the device is busy, but that’s ok.
  3. Reboot with sudo reboot. When the system boots, you’ll have a smaller filesystem living inside a larger partition.
  4. The next magic command is resize2fs. Run sudo resize2fs /dev/sda1 – this form will default to making the filesystem to take all available space on the partition.

That’s it, we’ve just resized a partition on which Ubuntu is installed, without booting from an external drive.

nameof expression (C# reference)

nameof expression produces the name of a variable, type, or member as the string constant. A nameof expression is evaluated at compile time and has no effect at run time. When the operand is a type or a namespace, the produced name isn’t fully qualified. The following example shows the use of a nameof expression:

Console.WriteLine(nameof(System.Collections.Generic));  // output: Generic
Console.WriteLine(nameof(List<int>));  // output: List
Console.WriteLine(nameof(List<int>.Count));  // output: Count
Console.WriteLine(nameof(List<int>.Add));  // output: Add

List<int> numbers = [1, 2, 3];
Console.WriteLine(nameof(numbers));  // output: numbers
Console.WriteLine(nameof(numbers.Count));  // output: Count
Console.WriteLine(nameof(numbers.Add));  // output: Add

Read more here

Default value for a boolean parameter in JavaScript function

See following example;

You could skip the ternary, and evaluate the “not not x”, e.g. !!x.

If x is undefine, !x is true, so !!x becomes false again. If x is true !x is false so !!x is true.

function logBool(x) {
    x = !!x;

var a, b = false, c = true;
logBool(a); // false
logBool(b); // false
logBool(c); // true