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Length Property
Whether your strings are coming in from external sources for display, or someone is entering text into a form field we created, we can access the number for the amount of characters that the string contains. We can use all of the string comparison operators in ActionScript 3.0 to compare lengths in our conditional statements.

The most common thing a webmaster or web applications creator would use this for is checking the length property of a form field to see if it is empty or not. Then they give a message back to the user saying "Please Enter Your Name", if that is the field the person has forgotten to fill in. We also check many times to see that a username is not too long or short when a person joins our site through a flash registration form. We want everything to be just right. And if it is not just right we do not process a single thing until they get it right.

Note: You can place ( ! ) in front of the variable when using the length property to check if it is empty.

Here is an example of determining the length of a string and giving a message when we run a conditional on it. Both examples comparisons below have identical functionality.
Learn HTML
var string1:String = "";

if (!string1.length) {
    trace("Please enter some text");
} else {
    trace("Your name is " + string1);

// ------------------------------------------------

if (string1.length < 1) {
    trace("Please enter some text");
} else {
    trace("Your name is " + string1);

Develop PHP browser display window
Please enter some text

Now let's make sure that a user has supplied a username between 5 and 15 characters in character length.
Learn HTML
var userName:String = "Jack";

if ((userName.length < 5) || (userName.length > 15)) {
    trace("Your username must be between 5 and 15 characters");
} else {
    trace("Your user name is " + userName);

Develop PHP browser display window
Your username must be between 5 and 15 characters
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