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Razor Page

This article showcases how to create a Telerik MediaPlayer with a playlist and bind its data to a remote DataSource in Razor Pages.

The following example uses two widgets: a MediaPlayer and a ListView, which serves as a playlist. There are two main steps in the suggested implementation:

  1. Bind the ListView to a remote DataSource, which provides a title, poster and source for the video.

  2. In the Change event of the ListView, assign the values of the title, poster and source properties to the MediaPlayer.

See the implementation details in the example below. For the full project with Razor Pages examples, visit our GitHub repository.

@page
@model Telerik.Examples.RazorPages.Pages.MediaPlayer.MediaPlayerPlaylistModel
@{
    ViewData["Title"] = "MediaPlayerPlaylist";
}

@using Telerik.Examples.RazorPages.Models

@inject Microsoft.AspNetCore.Antiforgery.IAntiforgery Xsrf
@Html.AntiForgeryToken()

// Create a temmplate for the ListView(Playlist).
<script type="text/x-kendo-template" id="template">
    <li class="k-item k-state-default" onmouseover="$(this).addClass('k-state-hover')"
        onmouseout="$(this).removeClass('k-state-hover')">
        <span>
            <img src="#:Poster#" />
            <h5>#:Title#</h5>
        </span>
    </li>
</script>

@(Html.Kendo().MediaPlayer()
        .Name("mediaPlayer")
        .AutoPlay(false)
        .HtmlAttributes(new { style = "height:720px" })
)

<div class="k-list-container playlist">
    @(Html.Kendo().ListView<Video>()
            .Name("listView")
            .TagName("ul")
            .ClientTemplateId("template") // Set the template from above.
            .DataSource(dataSource => dataSource
                    .Ajax()
                    .Read(read => read.Url("/MediaPlayer/MediaPlayerPlaylist?handler=Read").Data("forgeryToken"))
                )
            .Selectable(true)
            .Events(e => e
                .Change("onChange")
                .DataBound("onDataBound"))
        )
</div>

<script>
    function forgeryToken() {
        return kendo.antiForgeryTokens();
    }
    function onChange() {
        var index = this.select().index();
        var dataItem = this.dataSource.view()[index];

        // Play the video that was selected from the playlist.
        $("#mediaPlayer").data("kendoMediaPlayer").media({
            title: dataItem.Title,
            poster: dataItem.Poster,
            source: dataItem.Source
        });
    }

    // Select the first video when the page loads.
    function onDataBound() {
        this.select(this.content.children().first());
    }
</script>

<style>
    .k-mediaplayer {
        float: left;
        box-sizing: border-box;
        width: 70%;
    }
    .playlist {
        float: left;
        height: 720px;
        overflow: auto;
        width: 30%;
    }
    @@media(max-width: 800px) {
        .playlist,
        .k-mediaplayer {
            width: 100%;
        }
    }
    .playlist ul, .playlist li {
        list-style-type: none;
        margin: 0;
        padding: 0;
    }
    .playlist .k-item {
        border-bottom-style: solid;
        border-bottom-width: 1px;
        padding: 14px 15px;
    }
        .playlist .k-item:last-child {
            border-bottom-width: 0;
        }
    .playlist span {
        cursor: pointer;
        display: block;
        overflow: hidden;
        text-decoration: none;
    }
        .playlist span img {
            border: 0 none;
            display: block;
            height: 56px;
            object-fit: cover;
            width: 100px;
            float: left;
        }
    .playlist h5 {
        display: block;
        font-weight: normal;
        margin: 0;
        overflow: hidden;
        padding-left: 10px;
        text-align: left;
    }
</style>
using System.Collections.Generic;
using Kendo.Mvc.Extensions;
using Kendo.Mvc.UI;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Telerik.Examples.RazorPages.Models;

namespace Telerik.Examples.RazorPages.Pages.MediaPlayer
{
    public class MediaPlayerPlaylistModel : PageModel
    {
        private static IList<Video> videos;

        // Create sample data for the ListView(Playlist).
        public void OnGet()
        {
            if (videos == null)
            {
                videos = new List<Video>();

                videos.Add(new Video()
                {
                    Title = "Build HIPAA-Compliant Healthcare Apps Fast",
                    Poster = "https://img.youtube.com/vi/_S63eCewxRg/1.jpg",
                    Source = "https://www.youtube.com/watch?v=dyvxivS5EcI"
                });

                videos.Add(new Video()
                {
                    Title = "ProgressNEXT 2018 Highlights",
                    Poster = "https://img.youtube.com/vi/DYsiJRmIQZw/1.jpg",
                    Source = "https://www.youtube.com/watch?v=Gp7tcOcSKAU"
                });

                videos.Add(new Video()
                {
                    Title = "Benefits of Being a Progress Partner",
                    Poster = "https://i.ytimg.com/vi/xzrHbJmQbB8/1.jpg",
                    Source = "https://www.youtube.com/watch?v=xzrHbJmQbB8"
                });

                videos.Add(new Video()
                {
                    Title = "Progress Application Server OpenEdge",
                    Poster = "https://i.ytimg.com/vi/CpHKm2NruYc/1.jpg",
                    Source = "https://www.youtube.com/watch?v=3Ce11N9udR4"
                });
            }
        }

        public JsonResult OnPostRead([DataSourceRequest] DataSourceRequest request)
        {
            return new JsonResult(videos.ToDataSourceResult(request));
        }
    }
}
namespace Telerik.Examples.RazorPages.Models
{
    public class Video
    {
        public string Title { get; set; }

        public string Source { get; set; }

        public string Poster { get; set; }
    }
}
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