What is the JavaScript word for if something equals nothing?

Question

Say for instance I have an input textarea and I make a if statement:

if ("specified element id" == "absolutely nothing. The value equals nothing") {
"do this";
}

What is the name for if a value is equal to nothing. I don't believe it is 'undefined' because I tried that. I've tried 'null' as well.

Answer 1

Ok javascript can be tricky especially across browsers heres what you should try though:



1) status.value==""

2) status.value==null

3) status.value==undefined



With two and three don't put the words in quotes.

NOW I think your code is just completely wrong which is causing this error it should be as follows:



var check = document.getElementById(?).value;

else if (check=="") {

return false;

document.getElementById(?).style.display = "block";

}



You need to grab the particular element (In this case by its ID) to work with it. Replace the ? with the inputs id. Now I've never used "status" in Javascript before so I'm assuming its a custom defined variable you made? - Like the variable check I just made.

Answer 2

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Answer 3

If you mean if the textarea is blank, you want ""

Answer 4

in your case you might want to add bracket as this:

{cdl class:java.document=true

;return variables

1=x

}



and as such

Answer 5

if() == "") {

} else {

}