I'd like to validate a form using the jquery validate plugin, but I'm unable to use the 'name' value within the html - as this is a field also used by the server app. Specifically, I need to limit the number of checkboxes checked from a group. (Maximum of 3.) All of the examples I have seen, use the name attribute of each element. What I'd like to do is use the class instead, and then declare a rule for that.
html
This works:
<input class="checkBox" type="checkbox" id="i0000zxthy" name="salutation" value="1" />
This doesn't work, but is what I'm aiming for:
<input class="checkBox" type="checkbox" id="i0000zxthy" name="i0000zxthy" value="1" />
javascript:
var validator = $(".formToValidate").validate({
rules:{
"salutation":{
required:true,
},
"checkBox":{
required:true,
minlength:3 }
}
});
Is it possible to do this - is there a way of targeting the class instead of the name within the rules options? Or do I have to add a custom method?
Cheers, Matt
This question is related to
javascript
jquery
html
css
jquery-validate
You can add the rules based on that selector using .rules("add", options), just remove any rules you want class based out of your validate options, and after calling $(".formToValidate").validate({... });, do this:
$(".checkBox").rules("add", {
required:true,
minlength:3
});
Here's my solution (requires no jQuery... just JavaScript):
function argsToArray(args) {
var r = []; for (var i = 0; i < args.length; i++)
r.push(args[i]);
return r;
}
function bind() {
var initArgs = argsToArray(arguments);
var fx = initArgs.shift();
var tObj = initArgs.shift();
var args = initArgs;
return function() {
return fx.apply(tObj, args.concat(argsToArray(arguments)));
};
}
var salutation = argsToArray(document.getElementsByClassName('salutation'));
salutation.forEach(function(checkbox) {
checkbox.addEventListener('change', bind(function(checkbox, salutation) {
var numChecked = salutation.filter(function(checkbox) { return checkbox.checked; }).length;
if (numChecked >= 4)
checkbox.checked = false;
}, null, checkbox, salutation), false);
});
Put this in a script block at the end of <body> and the snippet will do its magic, limiting the number of checkboxes checked in maximum to three (or whatever number you specify).
Here, I'll even give you a test page (paste it into a file and try it):
<!DOCTYPE html><html><body>
<input type="checkbox" class="salutation">
<input type="checkbox" class="salutation">
<input type="checkbox" class="salutation">
<input type="checkbox" class="salutation">
<input type="checkbox" class="salutation">
<input type="checkbox" class="salutation">
<input type="checkbox" class="salutation">
<input type="checkbox" class="salutation">
<input type="checkbox" class="salutation">
<input type="checkbox" class="salutation">
<script>
function argsToArray(args) {
var r = []; for (var i = 0; i < args.length; i++)
r.push(args[i]);
return r;
}
function bind() {
var initArgs = argsToArray(arguments);
var fx = initArgs.shift();
var tObj = initArgs.shift();
var args = initArgs;
return function() {
return fx.apply(tObj, args.concat(argsToArray(arguments)));
};
}
var salutation = argsToArray(document.getElementsByClassName('salutation'));
salutation.forEach(function(checkbox) {
checkbox.addEventListener('change', bind(function(checkbox, salutation) {
var numChecked = salutation.filter(function(checkbox) { return checkbox.checked; }).length;
if (numChecked >= 3)
checkbox.checked = false;
}, null, checkbox, salutation), false);
});
</script></body></html>
If you want add Custom method you can do it
(in this case, at least one checkbox selected)
<input class="checkBox" type="checkbox" id="i0000zxthy" name="i0000zxthy" value="1" onclick="test($(this))"/>
in Javascript
var tags = 0;
$(document).ready(function() {
$.validator.addMethod('arrayminimo', function(value) {
return tags > 0
}, 'Selezionare almeno un Opzione');
$.validator.addClassRules('check_secondario', {
arrayminimo: true,
});
validaFormRichiesta();
});
function validaFormRichiesta() {
$("#form").validate({
......
});
}
function test(n) {
if (n.prop("checked")) {
tags++;
} else {
tags--;
}
}
Another way you can do it, is using addClassRules. It's specific for classes, while the option using selector and .rules is more a generic way.
Before calling
$(form).validate()
Use like this:
jQuery.validator.addClassRules('myClassName', {
required: true /*,
other rules */
});
Ref: http://docs.jquery.com/Plugins/Validation/Validator/addClassRules#namerules
I prefer this syntax for a case like this.
Since for me, some elements are created on page load, and some are dynamically added by the user; I used this to make sure everything stayed DRY.
On submit, find everything with class x, remove class x, add rule x.
$('#form').on('submit', function(e) {
$('.alphanumeric_dash').each(function() {
var $this = $(this);
$this.removeClass('alphanumeric_dash');
$(this).rules('add', {
alphanumeric_dash: true
});
});
});
I know this is an old question. But I too needed the same one recently, and I got this question from stackoverflow + another answer from this blog. The answer which was in the blog was more straight forward as it focuses specially for this kind of a validation. Here is how to do it.
$.validator.addClassRules("price", {
required: true,
minlength: 2
});
This method does not require you to have validate method above this call.
Hope this will help someone in the future too. Source here.
Here's the solution using jQuery:
$().ready(function () {
$(".formToValidate").validate();
$(".checkBox").each(function (item) {
$(this).rules("add", {
required: true,
minlength:3
});
});
});
Source: Stackoverflow.com