Javascript Form Validate Empty Field function

This function will interpret a string of spaces as a filled out field, although it is considered empty in most practical cases. Also, value of a text field is never Null, but rather a zero-length string. I think this code would work better:
function isEmpty(aTextField){
var re = /s/g; //Match any white space including space, tab, form-feed, etc.
var str = aTextField.replace(re, "");
if (str.length == 0) {
return true;
} else {return false;}
}

Correction for the previous post:
function isEmpty(aTextField){
var re = /\s/g; //Match any white space including space, tab, form-feed, etc.
var str = aTextField.replace(re, "");
if (str.length == 0) {
return true;
} else {return false;}
}

Correction for the previous post (IE support):
function isEmpty(aTextField){
var re = /\s/g; //Match any white space including space, tab, form-feed, etc.
RegExp.multiline = true; // IE support
var str = aTextField.replace(re, "");
if (str.length == 0) {
return true;
} else {return false;}
}

The following code didn't work for me:

function isEmpty(aTextField){
var re = /\s/g; //Match any white space including space, tab, form-feed, etc.
RegExp.multiline = true; // IE support
var str = aTextField.replace(re, "");
if (str.length == 0) {
return true;
} else {return false;}
}

I received a message that the property or method wasn't supported on the following line:

var str = aTextField.replace(re, "");

Does anyone have any ideas or have they gotten this code to work?

I was able to the following code to work but it allows spaces as being true and that won't work for what I need.

Thanks in advance,

Kay

Sorry. I forgot to add the code that did work. Here it is:

function IsEmpty(aTextField) {
if ((aTextField.value.length==0) ||
(aTextField.value==null)) {
return true;
}
else { return false; }
}

Thanks,

Kay

this is sweet

if(document.form.text1.value=="")
{
alert("Invaled");
return false;
}

no

I came across this code and I am novice at javascript. Is there a way to determine if the form field has not been completed. Then, automatically input a default value for the non-completed form field? Then, it will process based on default values. Thanks for any ideas.

Terry

There is a way to set default values. If the field is not completed set document.nameofform.nameoffield.value to whatever you want the field to be.
Obviously, you'll need to replace "nameofform" and "nameoffield" to whatever their names are in your HTML code.

To Zoya,

Your Code works perfect! It is a good code for checking Empty and any white spaces in the form fields.

Thank you for that!

Regards,
a dude

Will this function work in reverse? I have 4 text fields and require only one to be completed. Only if a field is completed should it then be validated. I have tried the following with no success in IE. The first part works, but the second part it ignored.

function validate(){
if ((document.housecall.email.value == "") && (document.housecall.phone.value == "") && (document.housecall.cell.value == "") && (document.housecall.pager.value == ""))
{
alert('Please provide your contact information');
return false;
}
else if ((document.housecall.email.value.length!=0) || (document.housecall.email.value!=null) || (document.housecall.email.value!= ""))
{
alert('Validate email');
return false;
}
}

What tag does the code go next too? Does it go in the tag or next to it?

I'm not sure what you mean. Perhaps viewing the whole page will help...

http://www.glass-dr.com/form_test.htm

I would like to have a validation code for trimming white spaces in the beginning as well as ending of a string.

I would like to have a validation code for trimming white spaces in the beginning as well as ending of a string.Expecting a quick response.

I got a problem with trimming my string...i have a field which requires an input. when the user tries to input a space it still updates the data. what will i do?

Actually, here is a better function without any workarounds for crappy browsers like IE:

function isEmpty(mytext) {
var re = /^\s{1,}$/g; //match any white space including space, tab, form-feed, etc.
if ((mytext.value.length==0) || (mytext.value==null) || ((mytext.value.search(re)) > -1)) {
return true;
}
else {
return false;
}
}

in somecases aTextField.value==null don't work, better use aTextField.value==""
see a sample in http//www.comucom.com

What's bad about:


function IsEmpty(Txt) {
return ((Txt.value.length==0) || (Txt.value==null))
}