[SOLVED] backspace aka. substring function

[haolan]

Hi phpfreaks..

 

I am trying to create a function to remove one number from a textbox, just like a backspace button.

I have made the following code:

 

function backspace() {

display = document.post_form.post_display.value;

disp_length = display.length;

 

newString = display.substring(0, disp_length - 1);

document.post_form.post_display.value = newString.ToString();

}

 

My form is named post_form and the textbox is named post_display.

 

This code does not work.. What is wrong?

[emehrkay]

i always say it is easier/more accurate to reference an element by id

document.getElementById('eleid').value = whatever;

 

first alert newString and see if it is doing what you want. then use the reference by id technique

[mainewoods]

change to 'minus 2'

newString = display.substring(0, disp_length - 2);