ansaurus

Question

Answer 1

A:

You can do this in javascript by writing a lot of code or I strongly recommend using jquery validation plugin. Look at this example: http://jquery.bassistance.de/validate/demo/radio-checkbox-select-demo.html

You can do something like:

<input type="radio" validate="required:true" name="family" value="s" id="family_single" class="error">

Which will require at least one option being selected.

Also, its best to have inline feedback when something is not valid. Having alerts can be really annoying.

Amir Raminfar 2010-10-26 15:05:47

Answer 2

A:

var radioCount = 0;
var checkBoxCount = 0;
var currentElement;

for (var i = 0; i < elem.length; ++i) {
  currentElement = elem[i];

  if (!currentElement.checked)
    continue;
  if (currentElement.type == "checkbox")
    ++checkBoxCount;
  else if (currentElement.type == "radio")
    ++radioCount;
}

if (radioCount < 3)
  //fail

if (checkBoxCount < 1)
  //fail

Sam Dufel 2010-10-26 15:08:44

Answer 3

+1 A:

Here's a modified version of your function:

function DisplayFormValues() { 
    var str = ''; 
    var elem = document.getElementById('frmMain').elements; 
    var groups = { 'r1': 0, 'r2': 0, 'r3':0, 'c1': 0 };

    for (var i = 0; i < elem.length; i++){
        if (elem[i].checked) {
            var n = elem[i].name;
            groups[n] += 1
            str += elem[i].value + "<br>";
        }
    } 

    document.getElementById('lblValues').innerHTML = groups['r1'] + "/" + 
        groups['r2'] + "/" + groups['r3'] + "/" + groups['c1']; 
    document.frmMain.reset();
}

In this function we count how many elements are checked (obviously one for radio button in the same group but you understand the principle and this is flexible) and groups[XXX] is the count (with XXX being the group name). You can adjust to your needs and add the alert as requested.

RC 2010-10-26 15:17:50

ansaurus

tags:

views:

answers:

Adding form verification in this case

related questions