Validating fields in html

30-Apr-2020 10:28 by 8 Comments

Validating fields in html - Free live chats with horny girls no credit card needed

The HTML form we will be working at in these chapters, contains various input fields: required and optional text fields, radio buttons, and a submit button: The validation rules for the form above are as follows: This code adds a script tag and an alert command.And when the page loads, the Java Script code will be executed (the user will see an alert box).

validating fields in html-72validating fields in html-66validating fields in html-69

When users enter values into an HTML form, the values that they enter are strings.If it has not been submitted, skip the validation and display a blank form.However, in the example above, all input fields are optional.Note Important Validating user input is also important for security.When you restrict the values that users can enter in forms, you reduce the chance that someone can enter a value that can compromise the security of your site.This is just a simple and harmless example how the PHP_SELF variable can be exploited.

Be aware of that any Java Script code can be added inside the - this would not be executed, because it would be saved as HTML escaped code, like this: <script>location.href(' The code is now safe to be displayed on a page or inside an e-mail.

In many cases, the values you need are some other data types, like integers or dates.

Therefore, you also have to make sure that the values that users enter can be correctly converted to the appropriate data types.

Sending data is not enough — we also need to make sure that the data users fill out in forms is in the correct format that we need to process it successfully, and that it won't break our applications.

We also want to help our users to fill out our forms correctly and not get frustrated when trying to use our apps.

You might also have certain restrictions on the values.