Uncaught TypeError: Cannot read property ‘value’ of undefined

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Seems like one of your values, with a property key of ‘value’ is undefined. Test that i1, i2and __i are defined before executing the if statements:

var i1 = document.getElementById('i1');
var i2 = document.getElementById('i2');
var __i = {'user' : document.getElementsByName("username")[0], 'pass' : document.getElementsByName("password")[0] };
if(i1 && i2 && __i.user && __i.pass)
{
    if(  __i.user.value.length >= 1 ) { i1.value=""; } else { i1.value="Acc"; }

    if(  __i.pass.value.length >= 1 ) { i2.value=""; } else { i2.value="Pwd"; }
}

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