jQuery Validate复选框（组至少一个）

Question

I've a very complex form with X groups of checkboxes like this:

<div class="checkbox-block1">
 <input id="package-1-1" name="member[1][package][19]" type="checkbox" class="checkbox" value="100" style="float: left;">
 <input id="package-1-2" name="member[1][package][234]" type="checkbox" class="checkbox" value="300" style="float: left;">
 <input id="package-1-3" name="member[1][package][254]" type="checkbox" class="checkbox" value="500" style="float: left;">
</div>
<div class="checkbox-block2">
 <input id="package-2-1" name="member[2][package][19]" type="checkbox" class="checkbox" value="100" style="float: left;">
 <input id="package-2-2" name="member[2][package][234]" type="checkbox" class="checkbox" value="300" style="float: left;">
 <input id="package-2-3" name="member[2][package][254]" type="checkbox" class="checkbox" value="500" style="float: left;">
</div>

I need to validate the form with a rules that require at least on checkbox for group/block. I try with:

      $(document).ready(function () {
            $("#myform-s3").validate({
                rules: {
                    'member[1]': {
                        required: true,
                        minlength: 1
                    },
                    'member[2]': {
                        required: true,
                        minlength: 1
                    },
                    'member[3]': {
                        required: true,
                        minlength: 1
                    }
                },
                errorPlacement: function(error, element) {
                    if ( element.is(':radio') || element.is(':checkbox') ) {
                        error.insertBefore( element.next() );
                    } else {
                        error.insertAfter( element );
                    }
                },
                submitHandler: function (form) { // for demo
                    alert('valid form');
                    return false;
                }
            });

But I got "Valid Form" also when no checkbox is selected.

PS: Number of blocks are selected by the user in a previous form, then I can have 1, 2, 3 or more blocks of checkboxes.

Answer 1

Your code...

rules: {
    'member[1]': {  // <- MUST be the NAME of input element

member[1] is not the name of anything so nothing is going to happen. You cannot use partial names or selectors here, just the actual value of the name attribute.

---

Solution 1

To validate a group of checkboxes, you need them all to share the same name ...

<div class="checkbox-block1">
    <input id="package-1-1" name="member[1]" type="checkbox" class="checkbox" value="100" style="float: left;">
    <input id="package-1-2" name="member[1]" type="checkbox" class="checkbox" value="300" style="float: left;">
    <input id="package-1-3" name="member[1]" type="checkbox" class="checkbox" value="500" style="float: left;">
</div>

And then you can simply use the required rule all by itself...

$(document).ready(function () {
    $("#myform-s3").validate({
        rules: {
            'member[1]': {
                required: true
            }, ....

DEMO 1: https://jsfiddle.net/1an60fxy/

---

Solution 2

If you cannot alter the naming, then you must dynamically declare the rules using the .rules() method and a "starts with", ^= , selector.

Do not declare the rules within .validate() ...

$(document).ready(function () {
    $("#myform-s3").validate({
        rules: {
            // other fields maybe
        ....

Use the .rules() method with an .each() and the required_from_group rule. Note, required_from_group is part of the additional-methods.js file .

$('[name^="member[1]"]').each(function() {
    $(this).rules('add', {
        require_from_group: [1, $('[id^="package-1"]')]
    });
});

Where 1 is the minimum number required from the group and $('[id^="package-1"]') targets all members of the group.

DEMO 2: jsfiddle.net/1an60fxy/2/

With this version, you get duplicated messages that you will have to handle with the groups option . Since your form is complex and dynamic, you will need to construct this option dynamically before you call .validate() . Here is an example .

var names1 = ""; // create empty string
$('[id^="package-1"]').each(function() { // grab each input starting w/ the class
    names1 += $(this).attr('name') + " "; // append each name + single space to string
});
names1 = $.trim(names1); // remove the empty space from the end

$("#myform-s3").validate({
    groups: {
        myGroup: names1 // reference the string
    }, 
    ....

DEMO 2b: jsfiddle.net/1an60fxy/3/