Validating text field

01-Nov-2015 02:21 posted by r0ck0n0wnd | Leave a comment

This means that validation occurs quickly and does not cause the page to reload or send anything to the server.

validating text field-20validating text field-84validating text field-2validating text field-18

For the purposes of this example we are keeping it simple and making everything required.Whether you are accepting input for something as simple as a guestbook or something as complex as an employment application, it makes sense to check the user’s input before committing it to a database or even an email.There are two basic types of validation: server-side and client-side.In this series we will be exploring client-side validation using Java Script.While client-side validation is not as secure as server-side validation, it does not require a roundtrip to the server.The first, valid, keeps track of whether or not we have found any invalid input.

We assume everything is good to start with by setting valid to true.

If any validation errors occur we’ll change valid to false.

However, before we can begin validating we need to create a Java Script function that handles all of our validation.

If you noticed, we have already given that function a name in our form tag above, validate My Form.

We’ll start simple by making sure that the user has entered something in the first name, last name, telephone, email, and number of years fields using the internet text boxes.

Here’s the code: function validate My Form() { // Create validation tracking variables var valid = true; var validation Message = 'Please correct the following errors:\r\n'; // Validate first name if (Element By Id('Text First Name').value.length == 0) { validation Message = validation Message + ' - First name is missing\r\n'; valid = false; } // Validate last name if (Element By Id('Text Last Name').value.length == 0) { validation Message = validation Message + ' - Last name is missing\r\n'; valid = false; } // Validate telephone if (Element By Id('Text Telephone').value.length == 0) { validation Message = validation Message + ' - Telephone is missing\r\n'; valid = false; } // Validate email if (Element By Id('Text Email').value.length == 0) { validation Message = validation Message + ' - Email is missing\r\n'; valid = false; } // Validate years on internet if (Element By Id('Text Internet Years').value.length == 0) { validation Message = validation Message + ' - Years using internet is missing\r\n'; valid = false; } // Display alert box with errors if any errors found if (valid == false) { alert(validation Message); } return valid; } Our first order of business in our validation function is to create two variables.

Leave a Reply

  1. Cam gratuit demo sexy 09-Nov-2015 08:40

    Is there anything in the Bible that restricts or permit’s a Christian to have a tattoo?

  2. Sex chat rooms for woman 11-Nov-2015 19:06

    How do I verify that I have the latest version of Flash Player?

  3. sex dating in bennington nebraska 09-Nov-2015 15:06

    And please have it link to this exact page, instead of our homepage.

  4. netkas method of updating to 10 5 5 08-Nov-2015 17:07

    Using the video chat, you can write to or talk with other users, with or without webcam in our cam chat.

dinamarca dating