Question

In the plain javascript function. Both the values, min_chk and max_chk are true, but the if function still shows the alert. not able to figure why?

function Checkit(m,n){
return m>n;
}

var min_chk = Checkit(a,X);
var max_chk = Checkit(b,Y);
if ((min_chk === 'true') && (max_chk === 'true')){
...
    } else {
    alert('invalid range');
}

Answer 1

The === operator returns false if the operands on both sides have different types. The boolean true and the string "true" have different types.

You should change your check just to

if (min_chk && max_chk)

Since min_chk and max_chk are already booleans, you don’t need to compare them directly with true.