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input type="submit" and button tag are they interchangeable? or if there is any difference then When to use input type="submit" and when button ?
And if there is no difference then why we have 2 tags for same purpose?
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A 'button' is just that, a button, to which you can add additional functionality using Javascript. A 'submit' input type has the default functionality of submitting the form it's placed in (though, of course, you can still add additional functionality using Javascript).
Definition and Usage. The <input type="submit"> defines a submit button which submits all form values to a form-handler. The form-handler is typically a server page with a script for processing the input data. The form-handler is specified in the form's action attribute.
submit : The button submits the form data to the server. This is the default if the attribute is not specified for buttons associated with a <form> , or if the attribute is an empty or invalid value. reset : The button resets all the controls to their initial values, like <input type="reset">.
You can use href=”#top” or href=”#” to link to the top of the current page. To use the anchor tag as submit button, we need the help of JavaScript. To submit the form, we use JavaScript . submit() function.
http://www.w3.org/TR/html4/interact/forms.html#h-17.5
Buttons created with the BUTTON element function just like buttons created with the INPUT element, but they offer richer rendering possibilities: the BUTTON element may have content. For example, a BUTTON element that contains an image functions like and may resemble an INPUT element whose type is set to "image", but the BUTTON element type allows content.
So for functionality only they're interchangeable!
(Don't forget, type="submit" is the default with button, so leave it off!)
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The <input type="button"> is just a button and won't do anything by itself. The <input type="submit">, when inside a form element, will submit the form when clicked.
Another useful 'special' button is the <input type="reset"> that will clear the form.
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