What's a cross-browser way to check if a JavaScript variable is a <form> DOM object?

Question

var form = document.createElement('form');

(form.isDOMForm()) would evaluate to true.

Sarfraz · Accepted Answer · 2010-06-29 12:14:56Z

6

You mean this:

var form = document.createElement('form');
alert(form.nodeName);

More Info:

http://www.howtocreate.co.uk/tutorials/javascript/dombasics

Note that you can also use tagName but nodeName seems to be a better choice.

edited Jun 29, 2010 at 12:14

answered Jun 29, 2010 at 12:09

Sarfraz

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4 Comments

Aistina Over a year ago

@Pekka, not always, it could be either upper or lowercase. Please read: ejohn.org/blog/nodename-case-sensitivity Other than that gotcha, yes, this is the way to do it.

Sean Hogan Over a year ago

I think that for HTML it is form.nodeName == "FORM" in all browsers. EDIT: what @Aistina said.

alex.zherdev Over a year ago

I would also convert it to (e.g.) uppercase before comparing, because I remember observing "FORM" string in firebug - probably case may vary

Tim Down Over a year ago

nodeName and tagName are precisely as good as each other in this situation where we know for certain that we're dealing with an element.

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