Need to require only one of a group of fields with Parsley - parsley.js

Question

I am using Parsley.js for validating a form submission on a project. One of my needs is to have Parsley require that at least one of three fields have data in them, and only fail validation if none of the three fields has data.
I am not sure from the documentation, how to accomplish this. I already have Parsley validation working on the rest of the form.

Answer 1

You can do that with a custom validator like so
var CheckReccursion = 0;
window.Parsley.addValidator('min3', {
validateString: function (value, requirement, instance) {
var notice =$('#notice').html(' ');
var group = $(requirement);//a class
var FieldsEmpty = 0;
var FieldsNotEmpty = 0;
var count = 0
group.each(function () {
var _val = $(this).val()
var length = _val.length
if (length > 0) {
FieldsNotEmpty++;
}
else {
FieldsEmpty++;
}
count++;
})
var isValid = (FieldsNotEmpty >=1)
//recursively execute
group.each(function (index) {
if (CheckReccursion === index) {
CheckReccursion++;
$(this).parsley().validate();
CheckReccursion = 0;
}
})
return isValid;
}
});
$(function () {
var ok=false;
var notice =$('#notice');
$('#form1').parsley().on('form:validated', function(formInstance) {
ok = formInstance.isValid({force: true});
})
.on('form:submit', function() {
if(!ok){
notice.html('Please fill at least 1 field');
return false;
}
else{
notice.html('okay');
return false;//change to true to submit form here
}
});
});
then add parsley attributes to the group of fields like so:
<form id="form1" data-parsley-validate="true">
<input type="text" name="field1"
data-parsley-min3 = ".group1"
data-parsley-min3-message = "At least 1 must be filled"
class="group1">
<input type="text" name="field2"
data-parsley-min3 = ".group1"
data-parsley-min3-message = "At least 1 must be filled"
class="group1">
<input type="text" name="field3"
data-parsley-min3 = ".group1"
data-parsley-min3-message = "At least 1 must be filled"
class="group1">
<span id="notice"></span>
<input type="submit" value="Submit">
</form>
Check out this fiddle https://jsfiddle.net/xcoL5Lur/6/

Answer 2

My advice is to add hidden checkbox element with the attribute:
data-parsley-mincheck="1"
now just add javascript code that checks the hidden checkbox attribute when your form input has value (and the opposite).
notice that you will need to add extra attribute to your hidden checkbox:
data-parsley-error-message="Please fill at least one input"

Answer 3

Another approach is to using data-parsley-group and the isValid({group,force}) method.
<input type="text" name="input1" data-parsley-group="group1">
<input type="text" name="input2" data-parsley-group="group2">
<input type="text" name="input3" data-parsley-group="group3">
$('#myform').parsley().on('form:validate', function (formInstance) {
if(formInstance.isValid({group: 'group1', force: true}) ||
formInstance.isValid({group: 'group2', force: true}) ||
formInstance.isValid({group: 'group3', force: true})) {
//do nothing
}
else {
$('#errorContainer').html('You must correctly fill at least one of these three groups!');
formInstance.validationResult = false;
}
});
you can add as many as parsley's attributes as you wish, like data-parsley-type="email" that will be validated when the given input is not empty.
we set the force: true because it it forces validation even on non-required.fields.
the html render for the errorContainer is needed because the isValid method does not affect UI nor fires events.