Hi,
using the dev tool (f12) you could view the event object.
eg. form.onsubmit=function(evt){
console.dir(evt);
}
and determine its target value.
there are two types of input elements that behave as buttons.
<input type="submit"/> and <input type="reset"/>
as opposed to <button> elements (which default with type submit) which have three type values eg.
<button type="submit"></button><button type="button"></button><button type="reset"></button>
a common error is to place a button element without a type attribute value (default submit) outside of a form element.... by default the button element click will fire the form.submit event handler.
Generally ALL of your form elements (tags input, button, select, textarea) must be children of the form element. You can list the form elements in the dev tool console with form.elements.
If you are using asp.net with form-postback and/or masterpages, you can also define the default button on a form page which associates Enter keypress with the form.submit event handler.
When possible please include a link to your website or a mashup (jsfiddle) with your questions.
Rob^_^
