Question

I want to listing all input elements in console of firebug so in console window write the followings:

var inputs = $(":input");
console.log(inputs);

but when I press the Run in console appear null

also when I write just var inputs = $(":input"); the console show Undefined I sure the page have a lot of input elements, where is the problem?

Answer 1

There is nothing wrong with the provided snippet.

Though, without specifying what to write (using console.log) firebug will print whatever the last statement returned, when declaring a variable using var the result is always undefined.

var inputs = $(":input"); // firebug printing 'undefined' is valid
var abc = 123;            // results in the same thing

---

Please make sure that the website in question actually uses jQuery (bound to global $), and that there really are input elements present in the DOM.

Also make sure that the jQuery version running is of a version later/equal to 1.0 (:input selector didn’t exists until then).

If it has jQuery it probably is of a more recent version, how ever; without you providing us with additional information there is no way to guarantee it.