Form java script using validating
The problem is that, to have the data submitted in a 'nice' format to the server, the function returns an array containing all the selected checkbox values. Again, we can make the code a lot simpler in supporting browsers: suffix tells a server side script such as PHP to accept multiple values with that name into an array.Normally you would modify this so that you could submit or not submit the form based on the number of items selected. Note that in this section we've been using the new ES6 syntax which may not be available in all browsers.
If you're working with arrays of checkboxes to submit data to a server-side script then you might already have some grey hairs from trying to figure out how to validate the input using Java Script.The expression for matching numbers and characters in the field is: /^[0-9a-z A-Z] $/ It’s must to provide validation in the select field.It happens sometimes, when user forgets to choose option from the select feild.Here I am giving you the form validation codes in Java Script. These are simple meta characters which do pattern matching. If the entered characters in the field is not in lower case or upper case. When it’s about checking contact field or zip code field, one need to check whether only the number have been entered or not.Regular expression helps you in pattern matching in string. : Matches any single charcter except a new line : Matches the preceding character or repeated character. The basic expression for matching entered value as number in the field is: /^[0-9] $/. [A-Z] : It matches characters from uppercase ‘A’ to lowercase ‘Z’. The codes for checking form empty fields are given below: There is an expression that checks whether the string contains only alphabets or not.
[a-z] : It matches characters from lowercase ‘a’ to lowercase ‘z’. If by mistake, user skips entering any detail, soon the alert message appear on the form.
It can prevent people from leaving fields blank, from entering too little or too much or from using invalid characters.
User-submitted data should also be verified using a secure server-side script.
If an user miss out any field, than the form will display error message.
Checking for form completion: The first step of form validation is to check, whether the user have entered information in all the fields or not.
Note: You do not need to do the things mentioned in this article if you have created your feedback form using the Feedback Form Script Wizard.