HTML8 Form Validation

Form validation:

One, non-null validation:

1, the content is not empty.

The length of the judging value is not 0. The Length property. A function that compresses spaces.

2, the content is not changed.

Second, comparative verification:

1. Verify the relationship of two control values (same, size)

2. Verify that the value of the control is related to a fixed value.

Three, scope verification:

Four, format verification:

The regular expression. RegularExpression

function Checkemail ()

{

var reg =/^\w+ ([-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] \w+) *$/;

var txt = document.getElementById ("Txtemail"). Value;

if (Txt.match (reg) = = null)

{

Alert ("Incorrect mailbox format");

return false;

}

Else

{

return true;

}

}

Five, Other Validation:

HTML8 Form Validation