javascript - On click function parameters Knockout -

i trying pass 1 parameter function knockout click binding. if try sending without binding, works.

here fiddle of working code without binding:

https://jsfiddle.net/obviously/ev0lcx7q/4/

but if try binding this, not works:

<input class="sometextbox">  <button type="button" data-bind="click: $root.somefunction.bind($root,$(this).siblings('input').val())"> search!  </button> 

i error @ $(this), javascript runtime error: object doesn't support property or method 'siblings'

$element gives access current element in knockout binding.

<input class="sometextbox"> <button type="button" data-bind="click: $root.somefunction.bind($root, $($element).siblings('input').val())"> search! </button> 

note using jquery in knockout binding not common approach.