I have a page that requests a partial view via AJAX and inserts it into the page. The view contains several kendo DatePickers. When I leave some of the required DatePickers empty and try to submit the form, I'm noticing my validation summary (created by @Html.ValidationSummary(false)) is not displaying anything, though submission is prevented. 

Yesterday I was receiving errors in the validation summary. I had one about a required DatePicker, that is in a hidden kendo Window being empty, and when I re-opened the window to address it, the validation error for the DatePicker was visible, but the DatePicker itself was gone. 

So these specific problems aside for the moment, my question is: I know for the standard jQuery validation and unobtrusive scripts, I have to remove the validator data from the form and then re-parse the form after inserting content dynamically. Is something similar required for kendo validation? Do I need to call kendoValidator() again?

What I do for the standard asp.net MVC validation:

I have a kendo ui multiselect setup using the code method. It populates fine and I can select values. However if I leave the field blank then run a kendo custom kendoValidator the select field never gets to the custom validation. It's like a blank is being marked as valid. Which means it never even makes it to the custom rules.Is there a setting i need when i create the control to tell it that blanks are not OK?

@(Html.Kendo().MultiSelect()
.Name("JobSelected")
.HtmlAttributes(new { @required = "required", @validationMessage = "Enter Job", @class = "form-control job" })
.DataTextField("Text")
.DataValueField("Value")
.Placeholder("Select Jobs...")
.DataSource(source =>
{
source.Read(read =>
{
    read.Action("JobsGetAll", "Application");
}).ServerFiltering(true);}).AutoBind(true))

//input is never the multiselect box

var validator = $("#personalDiv").kendoValidator({
                    rules: {
                        //implement your custom date validation
                        custom: function (input) {
                            if (input.is(".drp")) {
                                var ms = input.data("kendoDropDownList");
                                if (ms.value() == "-1") {
                                    input.parent().addClass("k-invalid");
                                    return false;
                                }
                                else {
                                    input.parent().removeClass("k-invalid");
                                    return true;
                                }
                            }
                            else if(input.is(".job")) 
                            {
                                var ms = input.data("kendoMultiSelect");
                                if (ms.value().length === 0) {
                                    input.parent().addClass("k-invalid");
                                    return false;
                                }
                                else {
                                    input.parent().removeClass("k-invalid");
                                    return true;
                                }
                            }
                            else if(input.is(".date") && input.val() != "") {
                                var currentDate = Date.parse($(input).val());
                                //Check if Date parse is successful
                                if (!currentDate) {
                                    return false;
                                }
                                //grad date needs to be in the future
                                if (input.is("#txtGradDate") || input.is("#txtStartDate")) {
                                    var d = new Date();
                                    if (currentDate < d) {
                                        return false;
                                    }
                                }
                            }
                            else if (input.is("[data-role=maskedtextbox]") && input.val() != "") {
                                var maskedtextbox = input.data("kendoMaskedTextBox");
                                return maskedtextbox.value().indexOf(maskedtextbox.options.promptChar) === -1;
                            }

                            return true;
                        }
                    }
                }).data("kendoValidator");

if (!validator.validate()) {
                    $("#personalDiv").removeClass("valid").addClass("invalid");
                    $('#btnPreviousPage').show();
                    $('#btnNextPage').show();
                    break;
                } else {
                    $("#personalDiv").removeClass("invalid").addClass("valid");
                }

We found that following features are totally undocumented , where <text> is a custom string :

1. options.fields.fieldName.validation.<attribute> = value; is generally passed-through like ad HTML attribute when kendo.ui.Editable is involved for editing corresponding model field <fieldName>
2. And so on options.fields.fieldName.validation.validationMessage  = "My custom message"; is generally passed-through like ad HTML attribute onto the corresponding INPUT dom element and it is very usefull when you need a custom validation message avoiding to deal with direct DOM manipulation
3. No document in your online KB mentions this behaviour associated to the Model.define() instead a KB page could be find related to the Validator https://docs.telerik.com/kendo-ui/controls/editors/validator/overview#application-of-custom-message-attributes , I think could save time to developers know that it is possibile and should be documented

Proofs in your code :

The CreateAttributes assembles object which contains the name:value pair from model field validation :

The editor choosed by the kendo.ui.Editable sets DOM attributes via attr() and the previously assembled object

The validator  looks the ruleKey validationMessage directly on DOM element of a INPUT tag

With this technique you can customize one validation message for a model field

I would like to create a validation message only for dropdownlist.

I'd like to get the text value of label.

label is parent of kendo dropdownlist

This solution doesn't work

kendo.d.ts v2017.3.1026

should be 

to support custom required message.

I am new to Kendo UI and trying to implement required field validation inside Kendo grid. All the functionalities like add/update/delete functionalities are working except required field validation.

Hi, my KenDo UI version is 2017.3.913, my chrome version is 61.0.3163.100

I found that my custom validation rule only fire once when it get error,

here is DOJO code: http://dojo.telerik.com/OGIlA/3

you can re-enter this situation by these step:

1.open dojo link and enter full screen mode

2.open chrome dev tool and set break point on line 72 (

)

3.click edit button and change unit price to 7777, then it will enter break point.

4.continue, and change value to 7778, then it will enter break point again.

5.continue and change value to 7777, then you can see it will not enter break point ,no fire validate function.

I don't know where I do wrong, or something I forget to setting, please help , thanks.