TypeName in VBScript to Javascript

Question

I need to convert following lines of vbscript codes to javascripts, If TypeName(document.all(cFieldName)) = "HTMLInputElement" Then and

ElseIf TypeName(document.all(cFieldName)) = "HTMLSelectElement" Then

I have tried if(typeof $("#" + (cFieldName)) === "HTMLInputElement") and else if(typeof $("#" + cFieldName) === "HTMLSelectElement") but they are not working.

Get and process some introductory Javascript teaching material, first. In this case, start by finding out what "typeof" actually does, what it returns. The strings you check for are not even part of the repertoire :) developer.mozilla.org/en-US/docs/JavaScript/Reference/Operators/… — Mörre
– Mörre, Commented Feb 11, 2013 at 9:36

T.J. Crowder · Accepted Answer · 2013-02-11 09:41:17Z

1

In this specific case, you can do this:

if (document.all[cFieldName].nodeName === "INPUT") {
    // It's an input element
}

and

if (document.all[cFieldName].nodeName === "SELECT") {
    // It's a select element
}

(That assumes HTML, rather than XHTML. In XHTML, the names will be lower case. To avoid messing myself up, I usually throw .toUpperCase() in there.)

As you've discovered, typeof will just give you "object". It's possible that on some engines, Object.prototype.toString.call(document.all[cFieldName]) might give you "HTMLInputElement", but I wouldn't expect it to be reliable cross-browser (and I assume one reason this code is being translated is to run it on browsers other than IE). There's more on various ways of figuring out what things are in JavaScript (though not specifically in regard to HTML elements) in my blog post Say what?.

edited Feb 11, 2013 at 9:41

answered Feb 11, 2013 at 9:36

T.J. Crowder

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2 Comments

Salman Arshad Over a year ago

Instead of .all you could use $("#selector").get(0).nodeName

T.J. Crowder Over a year ago

@SalmanA: Or even better, $("#selector")[0].nodeName (although document.all on IE has things in it by their name as well as by their id so an id selector may not be the right thing). I have to admit I didn't even notice the jquery tag and was just focussing on the typeof aspect. :-)

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