get element by id with particular value

[Pain]

Hi.

 

I want to get an element by id with a value, instead of just id.

 

<input name="select_one" type="radio"  value="METRO" id="radio" onClick="if(this.checked) document.getElementById('service14').disabled=true;" />

 

so here instead of disabling an element with id 'service14', i would like to disable an element with that id AND a value (let's say 'abc').

 

What do i need to change in that line?

 

Thank you!

 

[requinix]

1. Don't put complicated code in an onclick

2. In fact avoid using onclick attributes and instead attach event handlers

3.

if thing is checked {
    obj = get the object
    if obj value is "abc" {
       disable obj
    }
}