How do you check if fields are empty?

Okay, I know how to check if fields are null and stuff but how do I check to see if fields have no characters in them for example if I do this.

Javascript Code:

if(var === null || var === "" || var.length === 0)
{
   return false
}
else
{
//code here
}

Code (markup):

This only checks for certain types of emptyness. How do I check to make sure that the user inputed at least one character other than the 'space key'?
Thanks.

~imzoeb

 

Try this code:

if(var === null || var.replace(/[\s]/g,"").length===0)
{
   return false
}
else
{
//code here
}

Code (markup):

 

S_ruben, your code didn't work. Plz help!

 

Can you write here full script? It will be easier to help you.

 

Okay. Here is the script that doesn't work.

Javascript Code:

//get text
inputtext = "";
inputtext = "text=" + document.getElementById('inputbox').value;
//validate
if(inputtext === null || inputtext.replace(/[\s]/g,"").length===0)
{
}
else
{
//send text
	param = inputtext;
	xmlhttpsend.open("POST../../inputfunction.php",true);
	xmlhttpsend.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	xmlhttpsend.setRequestHeader("Content-length", param.length);
	xmlhttpsend.setRequestHeader("Connection", "close");
	xmlhttpsend.send(param);
}

Code (markup):

Thanks.

~imozeb

 

I have 2 questions

1. What doesn't work?
2. How can inputtext has no char if "inputtext = "text=" + document.getElementById('inputbox').value;"?

 

1. If the user just imputs spaces into the text field instead of letters, numbers, and symbols it still sends the value. (This results in the output box having a line of blank text. I want to only send the text if the user imputs letter or numbers or symbols with or without spaces.)

2. inputtext can have no chars because the user can (if they are evil) imput just spaces instead of letters, numbers, and symbols, which would result in document.getElementById('inputbox').value = " " (a few spaces).

Thanks.

 

Do it by this method:

//get text
inputboxvalue = document.getElementById('inputbox').value;

//validate
if(inputboxvalue === null || inputboxvalue.replace(/[\s]/g,"").length===0)
{
}
else
{
//send text
    inputtext = "text=" + inputboxvalue;
	param = inputtext;
	xmlhttpsend.open("POST../../inputfunction.php",true);
	xmlhttpsend.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	xmlhttpsend.setRequestHeader("Content-length", param.length);
	xmlhttpsend.setRequestHeader("Connection", "close");
	xmlhttpsend.send(param);
}

Code (markup):

 

Thanks s_ruben, it worked!