W3101: Scripting Languages: Javascript -- HW4

1. Implement the name and password cookie that we discussed in the class. That is, implement it as follows:


1. Have two fields, one "login" (text) field and a "password" field.
2. Enter the login and password fields with valid (non null, non blank) values. Have a submit button that sets a cookie with the login value, and another cookie with an "encrypted" password. You can use as simple or as complex an encryption function as you can. Please make sure you can not only encrypt but decrypt also the password.
3. When the cookie is not set, enter valid login and password values. Set the expiration time of the cookie to 1 year from the time it is set. Encrypt the cookie with your encryption function and show it in an alert box just before you set it.
4. If the cookie is set, read the values for login and password from cookie, decrypt the password and show the decrypted password in an alert box. Fill in the values of the login and password fields from those you read from the cookie.
5. If the cookie is already set, display the time of the last visit of the web page to the user in an alert box.
6. Have a button called "Delete cookie", that when clicked would delete the cookie. Note, all you need to do to reset a cookie is to set the expiration time to the current time and set the cookie.

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2. Implement a stop watch in Javascript, accurate to a hundreth of a second. It should show the hour, minute, second values and also the hundreth part of a second. You should update it once every 10 milliseconds. Have a button called "Start" that starts the stop watch. Change it to "Stop" as soon as the stop watch is running. When you click it, stop the stop watch and change the button again to "Start".