HTML tag easy to mix and error small summary

Tangled up the day, and finally the correct use of the HTML tags, the applicability of their respective clearly understood, here is a simple summary to avoid making similar mistakes.

It's all because of a problem like this

To run the above code, when nothing is entered when the "Login" button, will prompt "user name can not be empty", but only a moment will flash back. What is the reason?

The point is here.

At this point there will be two events triggered, first call the onclick corresponding function, and then automatic submit (because the type is a submit at this time), will naturally overwrite the hint. So the type is set to a button to resolve.

Here's a quick summary,

HtmlThe Type property of the label

value	Description
button	Define clickable buttons ( in most cases, use JavaScript to launch scripts ).
CheckBox	Define the check box.
File	Define input fields and "Browse" buttons for file uploads.
Hidden	Defines the hidden input field.
Image	Defines the submit button in the form of an image.
Password	Defines the password field. The characters in the field are masked.
Radio	Defines a radio button.
Reset	Defines the reset button. The reset button clears all the data from the form.
Submit	Define the Submit button. The submit button sends the form data to the server.
Text	Defines an input field for a single line in which the user can enter text. The default width is 20 characters.

Note: Type=button: simply a button function; Type=submit: Send form .

HTML label Type property

value	Description
Submit	The button is a Submit button (except Internet Explorer, which is the default value for other browsers).
button	the button is a clickable button (the default value for Internet Explorer).
Reset	the button is the reset button (clears the form data).

not finished ...

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