PHP Form Empty Fields
In this chapter you will learn:
Why
When form fields are empty, some data is not sent to the server. Sometimes the field is sent as an empty string; sometimes no field name is sent at all.
Action for empty fields
The following table illustrates the behavior of various form controls when they're not filled in or selected:
Form Control | What Happens When It's Not Filled In Or Selected |
---|---|
Text input field | The field name is sent, along with an empty value. |
Text area field | The field name is sent, along with an empty value. |
Password field | The field name is sent, along with an empty value. |
File select field | The field name is sent, along with an empty value. |
Hidden field | The field name is sent, along with an empty value. |
Checkbox field | Nothing is sent. |
Radio button field | Nothing is sent. |
Pull - down menu | A value is always sent. |
List box | Nothing is sent. |
Multi - select box | Nothing is sent. |
Submit button | Nothing is sent if the button isn't clicked. |
Image field | Nothing is sent if the button isn't clicked. |
Reset button | Nothing is sent. |
Push button | Nothing is sent. |
Next chapter...
What you will learn in the next chapter:
- Handle Form Multi-Value Fields
- Example - Multi-value from form select box
- Example - checkboxes with the same name
- How to handle multi-value fields
- Example - A Registration Form with Multi-Value Fields
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