enable submit if text matches

On the last page before submit I would like user to enter the password before submitting. I added a single line text box to capture the password.
Is there a way I can match this value with the password I provided to user and enable submit submit of password matches?

I tried the following code but its not working:
document.getElementById('QR~QID11').addEventListener('blur', function()
{
if (document.getElementById('QR~QID11').value == "test")
{   
this.enableNextButton();
}
else
{

this.disableNextButton();  
}},false);