How to validate username and password in javascript from database
Try looking into jQuery's AJAX function. Upon submission of the login form, send the username and password combo to http://universe.tc.uvu.edu/cs2550/assignments/PasswordCheck/check.php as follows. Show
This effectively validates your form submission. I prefer using the jQuery library as opposed to raw JS. You should look into it too. It's also worth noting that forms must ALWAYS be validated on the server side as well. Because a client could always just disable JavaScript in their browser to bypass your front end validation. As mentioned by someone who commented on your question, your method of backend validation is pretty insecure. Raw values of passwords should never be stored. Rather, it's good to use an sha1 hash of the password so that if an unwanted user somehow hacks into your DB he/she doesn't have all of the passwords stored in there. Also, username/password combination validation works a lot smoother on the backend if you just do something like
instead of using a static list. JavaScript : HTML Form validation - checking for passwordLast update on August 19 2022 21:50:37 (UTC/GMT +8 hours)Sometimes a password validation in a form is essential. You can create a password in different ways, it's structure may be simple, reasonable or strong. Here we validate various type of password structure through JavaScript codes and regular expression.
Following code blocks contain actual codes for the said validations. We have kept the CSS code part common for all the validations. CSS Code:
To check a password between 7 to 16 characters which contain only characters, numeric digits, underscore and first character must be a letterTo validate the said format we use the regular expression ^[A-Za-z]\w{7,15}$, where \w matches any word character (alphanumeric) including the underscore (equivalent to [A-Za-z0-9_]). Next the match() method of string object is used to match the said regular expression against the input value. Here is the complete web document. HTML Code:
JavaScript Code:
View the example in the browser To check a password between 6 to 20 characters which contain at least one numeric digit, one uppercase and one lowercase letterTo validate the said format we use the regular expression ^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{4,8}$. Next the match() method of string object is used to match the said regular expression against the input value. Here is the complete web document. HTML Code:
JavaScript Code:
View the example in the browser To check a password between 7 to 15 characters which contain at least one numeric digit and a special characterTo validate the said format we use the regular expression ^^(?=.*[0-9])(?=.*[[email protected]#$%^&*])[[email protected]#$%^&*]{7,15}$. Next the match() method of string object is used to match the said regular expression against the input value. Here is the complete web document. HTML Code:
JavaScript Code
View the example in the browser To check a password between 8 to 15 characters which contain at least one lowercase letter, one uppercase letter, one numeric digit, and one special characterTo validate the said format we use the regular expression ^(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[^a-zA-Z0-9])(?!.*\s).{8,15}$. Next the match() method of string object is used to match the said regular expression against the input value. Here is the complete web document. HTML Code:
JavaScript Code:
View the example in the browser Download the Validation code from herePrevious: JavaScript: HTML Form - Credit Card Number validation How do you validate login form using Javascript?The user will not be forwarded to the next page until given values are correct..
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