Programming Forums > Web Development and Design > JavaScript and Client-Side Browser Scripting

aznluvsmc · Dec 31st, 2005, 10:17 PM

Hi,

I created a little form on my website that contains a textarea for users to enter comments. Upon clicking submit, my validation function will check various things. I would like to check to see if the user entered anything in the comments section. If they didn't, I'd like to pop-up a confirm dialog box asking if they're sure they want to submit with no comments.

The problem is that I'm not sure how the if condition should look like to check the field. I tried the following but it doesn't seem to work. The <textarea> is named comment and there is no default value for it.

(Toggle Plain Text)

if (form.comment.value == "") {
     answer = confirm("No comments entered, are you sure?");
     }

aznluvsmc · Dec 31st, 2005, 10:22 PM

Sorry, please ignore this. I found out I have an odd problem on my form. I need to also use a regular expression to check for spaces in the comments.

Uday · Jan 7th, 2006, 11:59 PM

(Toggle Plain Text)

<html>
<head>
<title>Programming forum
</title>
</head>
<script language="javascript">
document.write("ENTER YOUR COMMENT");
function valuetest()
{

	if(test.comment.value=="") 
		{
     		alert("No comments entered");
     		}

}

</SCRIPT>
<form Name="test">
<input type="text" name="comment" value="">
<P><input type="Submit" onClick="valuetest()"></P>
</form>
</body>
</html>

This code need to be linked with CGI script.

Ooble · Jan 8th, 2006, 6:45 AM

Not only is that code far more complicated than it should be, it's also wrong. Your function doesn't return anything.

Oh, and don't use document.write.

Cerulean · Jan 8th, 2006, 10:30 AM

And remember to open your body tags (you have a closing one, strangely enough), and not mix uppercase and lowercase tags, or just don't even use uppercase tags. Tag soup is bad.

tempest · Jan 8th, 2006, 12:29 PM

Just for future reference, in case anyobdy searches for this later... the basic ways to access a form are:

(Toggle Plain Text)

document.forms["form_name"]["input_name"]

(Toggle Plain Text)

document.forms[form_index][input_index]

(Toggle Plain Text)

document.forms.form_name.Input_name

You can also do some weird hacks, but that covers the rudiments.

Dec 31st, 2005, 10:17 PM	#1
aznluvsmc Hobbyist Programmer Join Date: Aug 2005 Posts: 137 Rep Power: 3	How to check a <textarea> field in Javascript? Hi, I created a little form on my website that contains a textarea for users to enter comments. Upon clicking submit, my validation function will check various things. I would like to check to see if the user entered anything in the comments section. If they didn't, I'd like to pop-up a confirm dialog box asking if they're sure they want to submit with no comments. The problem is that I'm not sure how the if condition should look like to check the field. I tried the following but it doesn't seem to work. The <textarea> is named comment and there is no default value for it. (Toggle Plain Text) if (form.comment.value == "") { answer = confirm("No comments entered, are you sure?"); } if (form.comment.value == "") { answer = confirm("No comments entered, are you sure?"); }

Jan 7th, 2006, 11:59 PM	#3
Uday Programmer Join Date: Oct 2005 Location: India Posts: 30 Rep Power: 0	(Toggle Plain Text) <html> <head> <title>Programming forum </title> </head> <script language="javascript"> document.write("ENTER YOUR COMMENT"); function valuetest() { if(test.comment.value=="") { alert("No comments entered"); } } </SCRIPT> <form Name="test"> <input type="text" name="comment" value=""> <P><input type="Submit" onClick="valuetest()"></P> </form> </body> </html> <html> <head> <title>Programming forum </title> </head> <script language="javascript"> document.write("ENTER YOUR COMMENT"); function valuetest() { if(test.comment.value=="") { alert("No comments entered"); } } </SCRIPT> <form Name="test"> <input type="text" name="comment" value=""> <P><input type="Submit" onClick="valuetest()"></P> </form> </body> </html> This code need to be linked with CGI script.

Jan 8th, 2006, 6:45 AM	#4
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Not only is that code far more complicated than it should be, it's also wrong. Your function doesn't return anything. Oh, and don't use document.write. __________________ Me :: You :: Them

Jan 8th, 2006, 12:29 PM	#6
tempest Programming Guru Join Date: Oct 2004 Posts: 1,041 Rep Power: 5	Just for future reference, in case anyobdy searches for this later... the basic ways to access a form are: (Toggle Plain Text) document.forms["form_name"]["input_name"] document.forms["form_name"]["input_name"] (Toggle Plain Text) document.forms[form_index][input_index] document.forms[form_index][input_index] (Toggle Plain Text) document.forms.form_name.Input_name document.forms.form_name.Input_name You can also do some weird hacks, but that covers the rudiments. __________________

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Dec 31st, 2005, 10:22 PM	#2
aznluvsmc Hobbyist Programmer Join Date: Aug 2005 Posts: 137 Rep Power: 3	Sorry, please ignore this. I found out I have an odd problem on my form. I need to also use a regular expression to check for spaces in the comments.

Jan 8th, 2006, 10:30 AM	#5
Cerulean Professional Programmer Join Date: Apr 2005 Location: London, England Posts: 459 Rep Power: 4	And remember to open your body tags (you have a closing one, strangely enough), and not mix uppercase and lowercase tags, or just don't even use uppercase tags. Tag soup is bad.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Programming Forums > Web Development and Design > JavaScript and Client-Side Browser Scripting

How to check a <textarea> field in Javascript?