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Display Validation Messages in the Upload with Templates

Environment

Product Progress Kendo UI Upload for jQuery
Operating System Windows 10 64bit
Visual Studio version Visual Studio 2017
Preferred Language JavaScript

Description

How can I display a validation message in the Kendo UI Upload by using templates?

Solution

When the Upload is configured to use a template, the content of the template replaces some of the HTML elements of the widget that are rendered by default.

The following example demonstrates how to add a span element to the template. This allows a validation message to be conditionally displayed.

<div id="example">
    <input name="files" id="files" type="file" />
    <div class="demo-hint">You can only upload <strong>PDF</strong> files.</div>

    <script id="fileTemplate" type="text/x-kendo-template">
        <span class='k-progress'></span>
        <div class='file-wrapper'>
            <h4 class='file-heading file-name-heading'>Name: #=name#</h4>
            <h4 class='file-heading file-size-heading'>Size: #=size# bytes</h4>
            <span class='validation-message #=files[0].extension == ".pdf" ? "hide" : "show"#'>#=files[0].extension# file type not allowed. </span>
            <button type='button' class='k-upload-action'></button>
        </div>
    </script>

    <script>
        $(document).ready(function () {
            $("#files").kendoUpload({
                async: {
                    saveUrl: "save",
                    removeUrl: "remove"
                },
                validation: {
                    allowedExtensions: [".pdf"]
                },
                template: kendo.template($('#fileTemplate').html())
            });
        });
    </script>
    <style>
        .hide {
            display: none;
        }

        .show {
            display: inline;
        }

        .validation-message {
            color: red;
        }
    </style>
</div>

See Also

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