How to call function from text input key press in javascript?

Question

With

the alert box displays the value in the box, not included the current key dep

Answer 1

Passing 'value' as a parameter is generally verbotim - its a reserved word. Your 'this' refers to the input field, and so 'this.value' returns the entire content of the input field. To get the keyCode from the keypress event try:

This doesn't work with:

onKeyPress="event.charCode;"

or:

onKeyPress="this.event.charCode;"

because no event object is created.