如何使 select2 与 jquery.validation 插件一起工作？

Question

I'm trying to validate select2 field using jquey.validation plugin but nothing happens.

I want to make select required field.

I'm using this custom validation function:

$.validator.addMethod("requiredcountry", function(value, element, arg){
              return arg != value;
         }, "Value must not equal arg.");

and this is the rule:

rules:
{
 country:
 {
         required: true,
         requiredcountry: ""
 }
}

What select2 field should I use for the rule to match?

I appreciate any idea how to make select2 working together with jquery.validation

10x

Answer 1

Just add ignore: [], in Your form validation function. It will enable hidden field validation.So You will get validation for Select 2

$("#ContactForm").validate({
  ignore: [],       
  rules: {
    //Rules
  },
  messages: {
    //messages
  }
});

Answer 2

As a tip, please consider that the validate js bind itself to changes of select not select 2. This cause problem in below case:

1. There is a required select box which is converted to select2
2. You click the submit and the error shows that the select box is required.
3. You select some option from select 2.
4. The validation error does not hide automatically

You can fix it with:

     $("select").on("select2:close", function (e) {  
        $(this).valid(); 
    });

Answer 3

In Addition to ABIRAMAN's answer here is some code that

• Makes the select2 box red when errors appear
• List the error below the select2 box

---

<style>
  span.error{
    outline: none;
    border: 1px solid #800000;
    box-shadow: 0 0 5px 1px #800000;
  }
</style>

---

<script>
 $("#form").validate({
     rules: {
       email: "required"
     },
     highlight: function (element, errorClass, validClass) {
       var elem = $(element);
       if (elem.hasClass("select2-hidden-accessible")) {
           $("#select2-" + elem.attr("id") + "-container").parent().addClass(errorClass); 
       } else {
           elem.addClass(errorClass);
       }
     },    
     unhighlight: function (element, errorClass, validClass) {
         var elem = $(element);
         if (elem.hasClass("select2-hidden-accessible")) {
              $("#select2-" + elem.attr("id") + "-container").parent().removeClass(errorClass);
         } else {
             elem.removeClass(errorClass);
         }
     },
     errorPlacement: function(error, element) {
       var elem = $(element);
       if (elem.hasClass("select2-hidden-accessible")) {
           element = $("#select2-" + elem.attr("id") + "-container").parent(); 
           error.insertAfter(element);
       } else {
           error.insertAfter(element);
       }
     }
   });

$('select').select2({}).on("change", function (e) {
  $(this).valid()
});
</script>

Answer 4

I have detailed this in a blog post: http://chadkuehn.com/jquery-validate-select2/

When you place a Select2 on a SELECT tag it hides the original element. So in the validation plugin you must adjust the proper wrapping markup when highlighting and unhighlighting.

    highlight: function (element, errorClass, validClass) {
        var elem = $(element);
        if (elem.hasClass("select2-offscreen")) {
            $("#s2id_" + elem.attr("id") + " ul").addClass(errorClass);
        } else {
            elem.addClass(errorClass);
        }
    },

    unhighlight: function (element, errorClass, validClass) {
        var elem = $(element);
        if (elem.hasClass("select2-offscreen")) {
            $("#s2id_" + elem.attr("id") + " ul").removeClass(errorClass);
        } else {
            elem.removeClass(errorClass);
        }
    }

View a DEMO here.

Answer 5

Found an answer on the forums @ https://github.com/select2/select2/issues/215 posted by corinnaerin . Worked perfectly for me. Sample code at http://plnkr.co/edit/4QaSguIiYsJtLpuPF8Rc?p=preview

      var $select = $('select').select2({
        placeholder: 'Choose',
        allowClear: true
      });

      /*
       * When you change the value the select via select2, it triggers
       * a 'change' event, but the jquery validation plugin
       * only re-validates on 'blur'
       */
      $select.on('change', function() {
        $(this).trigger('blur');
      });

      $('#myForm').validate({
        ignore: 'input[type=hidden], .select2-input, .select2-focusser'
      });

Answer 6

I've found that getting Select2 to work with jQuery Validate very much depends on the markup used in creating the Select2 control.

For the most practical use of the plugin, you'll probably be using dynamically loaded data (data obtained via web service vs. static <option/> elements in the page). And per their spec , the way to accomplish this is by attaching Select2 to an <input type="hidden"/> element. However, elements of type="hidden" are not validated by jQuery Validate by default.

In order to validate hidden elements using jQuery Validate, one must tinker with the ignore property in jQuery Validate's configuration object. See the ignore option in their spec . Try initializing the ignore value as null to get the validation to trigger.

Answer 7

just add a line in your validation function.

$('#_form_id').validate({

       ignore: 'input[type=hidden]',
            rules: {
                //Rules
            },
            messages: {
               //messages
            },
}

Answer 8

check out my code. I solve my problem by using those codes... few(css,jquery) codes only

 $(document).ready(function() { //form validations--------------------------------------------------------- $('#sample').validate({ ignore: [], errorClass: "error", errorElement: "span" }); $("#receiver_name").select2({ placeholder: "Receiver Name" }); $("#receiver_name").select2().change(function() { $(this).valid(); }); });

 .error .select2-choice.select2-default, .error .select2-choices { color: #a94442; border-color: #a94442; -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075); box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075); } .error:focus, .error .select2-choice.select2-defaultLfocus, .error .select2-choicesLfocus { border-color: #843534; -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075), 0 0 6px #ce8483; box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075), 0 0 6px #ce8483; } .select2-container .select2-choices .select2-search-field input, .select2-container .select2-choice, .select2-container .select2-choices, .error { border-radius: 1px; }

 <html> <head> <!-- Latest compiled and minified CSS --> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous"> <!-- Optional theme --> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css" integrity="sha384-fLW2N01lMqjakBkx3l/M9EahuwpSfeNvV63J5ezn3uZzapT0u7EYsXMjQV+0En5r" crossorigin="anonymous"> <link href="https://cdnjs.cloudflare.com/ajax/libs/select2/3.5.2/select2.css" rel="stylesheet" /> <link href="https://cdnjs.cloudflare.com/ajax/libs/select2/3.5.2/select2-bootstrap.css" rel="stylesheet" /> </head> <body> <form id='sample'> <select class="form-control" name="receiver_name[]" id="receiver_name" multiple required> <option value="1">1</option> <option value="2">2</option> </select> </form> <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <!-- Latest compiled and minified JavaScript --> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js" integrity="sha384-0mSbJDEHialfmuBBQP6A4Qrprq5OVfW37PRR3j5ELqxss1yVqOtnepnHVP9aJ7xS" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/select2/3.5.2/select2.js"></script> </body> </html>

Answer 9

This doesn't work in Bootstrap Validator() because the validator includes all the inputs in the form. This means it will validate the input search field of the select2 plugin. which will interfere with the multiselect validation

To fix this simply go to the validator.js Add the select2 input search class .select2-search__field to the ignore list:

Validator.INPUT_SELECTOR = ':input:not([type="submit"], button, .select2-search__field):enabled:visible'

Answer 10

When you create a custom rule, you also must properly declare it. Since your custom rule depends on an argument, then you must pass the argument when declaring the rule

rules: {
   country: {
       required: true,
       requiredcountry: "your argument here"  // <- declare the custom rule
   }
}

Answer 11

$("select.select2-me").each(function(index, el) {

    if ($(this).is("[data-rule-required]") && 
    $(this).attr("data-rule-required") == "true") {
        $(this).on('select2-close', function(e) {
            $(this).valid()
        });
    }
});

work for me.

Answer 12

You can check this link: https://github.com/rkeshmir/select2-validation Here you can find the simplest way to validate select2 components. The idea id trigger validation for all <select> items in DOM on their change event. Also I have added required CSS rules to highlight error and success states of input.

Answer 13

To validate 'select2' inputs you first must tell jquery validate to consider hidden elements:

$.validator.setDefaults({ 
ignore: [],
});

This is custom highlight / unhighlight that i use for pointing select2 and tagit errors with jquery validate:

$("#someform").validate({
        rules: {
            nazwa: {
                required: true
            },
            ilosc_w_opakowaniu: {
                required: "#czy_opakowanie_zbiorcze:checked"
            }
        },
        messages: {
            nazwa: "Musisz wypełnić pole [Nazwa]",
            ilosc_w_opakowaniu: "Musisz podać ilość produktu w opakowaniu zbiorczym",
        },

        highlight: function( element, errorClass, validClass ) {
            if ( element.type === "radio" ) {
                this.findByName( element.name ).addClass( errorClass ).removeClass( validClass );
            } else {
                $( element ).addClass( errorClass ).removeClass( validClass );
            }

            // select2
            if( $(element).hasClass('select2-hidden-accessible') ){
                dzik = $(element).next('span.select2');
                if(dzik)
                    dzik.addClass( errorClass ).removeClass( validClass );
            }

            // tagit
            dzik2 = $(element).parent().find('ul.tagit') 
            if( dzik2.length == 1 )
                dzik2.addClass( errorClass ).removeClass( validClass );

        },
        unhighlight: function( element, errorClass, validClass ) {
            if ( element.type === "radio" ) {
                this.findByName( element.name ).removeClass( errorClass ).addClass( validClass );
            } else {
                $( element ).removeClass( errorClass ).addClass( validClass );
            }

            // select2
            if( $(element).hasClass('select2-hidden-accessible') ){
                dzik = $(element).next('span.select2');
                if(dzik)
                    dzik.removeClass( errorClass ).addClass( validClass );
            }

            // tagit
            dzik2 = $(element).parent().find('ul.tagit') 
            if( dzik2.length == 1 )
                dzik2.removeClass( errorClass ).addClass( validClass );
        }
     });

And some CSS:

/** select2 error hightight **/
.select2.error .select2-selection--single{
    border-color:red !important;
    color:red !important;
}

/** tagit error highlight **/
.tagit.error{
   border-color:red !important;
   color:red !important;
}

Answer 14

I solved the problem, the solution is to modify the highlight, unhighlight and above all errorPlacement methods for each instance of validate. However, in order not to modify each file, I put the modifications in the file jquery.validate.js

highlight: function( element, errorClass, validClass ) {
        if ( element.type === "radio" ) {
            this.findByName( element.name ).addClass( errorClass ).removeClass( validClass );
        } else {
            var elem = $(element);
            if (elem.attr('readonly') == 'readonly') {
                if (elem.hasClass("input-group-addon")) {
                   $("#" + elem.attr("id")).parent().addClass(errorClass);
                } else {
                    $( element ).addClass( errorClass ).removeClass( validClass );
                }
            } else {
                if (elem.hasClass("select2-hidden-accessible")) {
                   $("#select2-" + elem.attr("id") + "-container").parent().addClass(errorClass);
                } else {
                    $( element ).addClass( errorClass ).removeClass( validClass );
                }
            }
        }
    },
    unhighlight: function( element, errorClass, validClass ) {
        if ( element.type === "radio" ) {
            this.findByName( element.name ).removeClass( errorClass ).addClass( validClass );
        } else {
            var elem = $(element);
            if (elem.attr('readonly') == 'readonly') {
                if (elem.hasClass("input-group-addon")) {
                   $("#" + elem.attr("id")).parent().removeClass(errorClass);
                } else {
                    $( element ).addClass( errorClass ).removeClass( validClass );
                }
            } else {
                if (elem.hasClass("select2-hidden-accessible")) {
                    $("#select2-" + elem.attr("id") + "-container").parent().removeClass(errorClass);
                } else {
                    $( element ).removeClass( errorClass ).addClass( validClass );
                }
            }
        }
    },
    errorPlacement: function(error, element) {
        var elem = $(element);
        if (elem.attr('readonly') == 'readonly') {
            element = $("#" + elem.attr("id")).parent();
            error.insertAfter(element);
        } else {
            if (elem.hasClass("select2-hidden-accessible")) {
                element = $("#select2-" + elem.attr("id") + "-container").parent().parent().parent();
                error.insertAfter(element);
            } else {
                error.insertAfter(element);
            }
        }
    }

Answer 15

According to the error placement logic of jQuery validator, you may use the markup like below.

<div class="input-group col-sm-12">
  <select class="form-control select2" id="ELEMENT ID" name="ELEMENT NAME">
  </select>
</div>

It will place the error block below the select2 box and make the error block visible.