473,574 Members | 2,629 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Check Box Problem

19 New Member
Hello all,
My problem,i have written a javascript to check whether the checkboxes are checked or not.If its not checked,i will get an alert message,if i checked then say it is checked.This condition is working for more than one data.If there is only one data and if i check that also,i am gettin an alert message and says its not checked.Please help me to solve this.

Javascript am using is,

Expand|Select|Wrap|Line Numbers
  1.     var total=""
  2.         for(var i=0; i < document.formname.field_id.length; i++)
  3.         {
  4.             if(document.formname.field_id[i].checked)
  5.                total +=document.formname.field_id[i].value + "\n"
  6.         }
  7.  
  8.        if(total=="")
  9.         {
  10.             alert("Please select one data") 
  11.             return false; 
  12.         }
Apr 6 '09 #1
2 1290
Dormilich
8,658 Recognized Expert Moderator Expert
I think that's because you get the field by "document.formn ame.field_id", which in this case returns a HTMLInputElemen t (an element node, that doesn't have the length property) instead of a HTMLCollection (several elements with the same name - an element node-set).

to overcome this use the DOM method getElementsByNa me() which always returns a node-set.
Apr 6 '09 #2
dmjpro
2,476 Top Contributor
I think your CheckBox has the same name then you better to do ...

Expand|Select|Wrap|Line Numbers
  1. var check_boxes = document.getElementsByName("checkbox_name");
  2. for(var i=0;i<check_boxes.length;i++){
  3.  var checkbox_ref = check_boxes[i];
  4.  //do whatever you want to do with the reference
  5. }
  6.  
Actually document.formNa me.elementName. length does not work when the element is single ;)
Apr 6 '09 #3

Sign in to post your reply or Sign up for a free account.

Similar topics

17
2749
by: Dave Smithz | last post by:
Hi there, A PHP application I built has a section which lists a number of members to a club whose names each appear with a check box beside them that can be ticked. These check boxes are part of a form which amongst other submit buttons has a one particular submit button that if checked will send the form data (using GET) to a script...
8
2471
by: pw | last post by:
Hi, I need to create a function in javascript to check or uncheck all checkboxes in a form. From what I understand, I can do this either by specifying the name of the check box fields such as: function checkAll(list) { var o = document.getElementById(list); var c = o.checked; var f = document.forms.f; var a = f.item(list);
4
4058
by: welie | last post by:
I have a problem canceling a check box update when placing a check in it. Checkbox is not bound. Here is what happens. User clicks a check box. In the BeforeUpdate method of the control, if the check box is being checked, some validation is performed. If the validation fails, I set cancel to true, and the check box is not checked...
6
1950
by: Shannan Casteel via AccessMonster.com | last post by:
I'll explain as well as possible...not an experienced user...but learning. I am working on a database for different kinds of problems with machines. A user will be able to select a problem category from a combo box (i.e. Engine, Fuel, Electrical, Steering, Power Train, Brakes, Hydraulic, Chassis/Structure, etc.). Upon the users selection a...
1
4255
by: scprosportsman | last post by:
Please help guys, i am trying to set up a database here at work and im fairly new to access in terms of writing functions and queries and stuff. I have 2 different places on my design that will require checking a check box to tell which category something will pertain to. Well after each record is entered i want the check to remain with that...
6
2199
by: tommaso.gastaldi | last post by:
Hi, does anybody know a speedy analog of IsNumeric() to check for strings/chars. I would like to check if an Object can be treated as a string before using a Cstr(), clearly avoiding the time and resource consuming Try... Catch, which in iterative processing is totally unacceptable. -tom
12
14520
by: tshad | last post by:
What would be a good way to check programmatically whether a service was running? We have a service that dies periodically and I need to check to see if this service is running. I know how to check to see if the status is in stopped or running mode. But that doesn't tell me if it is actually running. I need to know this so that if it...
16
5646
by: Brian Tkatch | last post by:
Is there a way to check the order in which SET INTEGRITY needs to be applied? This would be for a script with a dynamic list of TABLEs. B.
1
1413
by: icetalks | last post by:
have a look at this code , its for logging the user in after checking his UserName and Password. dim check as boolean = false ... ... If txtUserName.Text.Length = 0 And txtPass.Text.Length = 0 Then MessageBox.Show("please Enter Your Name and Password") txtUserName.Text = "" txtPass.Text = ""
2
6181
by: Ben | last post by:
Hi! All of a sudden on a newer version of our application a check box on the "Produce Invoice" form cannot be checked. I did not do any changes to this form at all. Below are the things that I know so far about the problem: 1. On the new version of the application the check box cannot be checked 2. On the previous version of the...
0
7737
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language...
0
8253
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that...
1
7827
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For...
0
8109
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the...
0
5316
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert...
0
3752
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in...
1
2253
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
1
1356
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
0
1072
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.