From 293eb767ef6f28290121bcf3a355676954537b7c Mon Sep 17 00:00:00 2001
From: Nadezhda Tacheva <Nadezhda.Tacheva@progress.com>
Date: Fri, 17 May 2024 16:46:06 +0300
Subject: [PATCH] kb(gantt): different colors for tasks

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+---
+title: Set Different Colors for the Gantt Tasks
+description: How to set different colors for the Gantt tasks?
+type: how-to
+page_title: Set Different Colors for the Gantt Tasks
+slug: gantt-kb-different-colors-for-tasks
+position: 
+tags: 
+ticketid: 1536209
+res_type: kb
+---
+
+## Environment
+<table>
+	<tbody>
+		<tr>
+			<td>Product</td>
+			<td>Gantt for Blazor</td>
+		</tr>
+	</tbody>
+</table>
+
+
+## Description
+
+I want to set different colors for the Gantt tasks. I store the colors in my data source. How to apply the colors from my data source to the rendered Gantt tasks?
+
+
+## Solution
+
+Follow these steps to apply the desired colors to the Gantt tasks:
+
+1. Use a [Task Template]({%slug gantt-task-template%}) to override the default task rendering.
+1. In the template, declare a wrapping element that will contain all the task details. Specify the desired task information inside.
+1. Add an attribute `style="background-color"` to the wrapper. Set the color from the template `context` or any other desired color.
+1. Use custom CSS remove the default padding of the task template element (`<div class="k-task-template">`) and adjust the custom wrapper, so it covers the whole task element. This will ensure that the background color will cover the whole task.
+
+>caption Set Different Colors for the Gantt Tasks
+
+````CSHTML
+<TelerikGantt Data="@Data"
+              Width="900px"
+              Height="600px"
+              IdField="Id"
+              ParentIdField="ParentId"
+              RowHeight="60"
+              OnUpdate="@UpdateItem"
+              OnDelete="@DeleteItem">
+    <TaskTemplate>
+        @{
+            CurrTask = context;
+        }
+        <div class="wrapper" style="background-color:@CurrTask.Color">
+            <div class="task-title">@CurrTask.Title</div>
+            <div class="task-assignee">Assignee: @CurrTask.Assignee</div>
+            <div class="progress" style="width:@(CurrTask.PercentComplete * 100)%"></div>
+        </div>
+    </TaskTemplate>
+    <GanttColumns>
+        <GanttColumn Field="Title"
+                     Expandable="true"
+                     Width="160px"
+                     Title="Task Title">
+        </GanttColumn>
+        <GanttColumn Field="Start"
+                     Width="100px"
+                     DisplayFormat="{0:d}">
+        </GanttColumn>
+        <GanttColumn Field="End"
+                     Width="100px"
+                     DisplayFormat="{0:d}">
+        </GanttColumn>
+    </GanttColumns>
+    <GanttViews>
+        <GanttWeekView></GanttWeekView>
+    </GanttViews>
+</TelerikGantt>
+
+@code {
+    private List<FlatModel> Data { get; set; }
+
+    private FlatModel CurrTask { get; set; } = new FlatModel();    
+
+    private int LastId { get; set; } = 1;
+
+    private List<string> Colors = new List<string>()
+    {
+        "lightgreen",
+        "orange",
+        "lightblue",
+        "cyan",
+        "lightcoral",
+        "lightpink"
+    };
+
+    protected override void OnInitialized()
+    {
+        Data = new List<FlatModel>();
+        var random = new Random();
+
+        for (int i = 1; i < 6; i++)
+        {
+            var newItem = new FlatModel()
+                {
+                    Id = LastId,
+                    Title = "Task  " + i.ToString(),
+                    Start = new DateTime(2021, 7, 5 + i),
+                    End = new DateTime(2021, 7, 11 + i),
+                    PercentComplete = Math.Round(random.NextDouble(), 2),
+                    Color = Colors[i]
+                };
+
+            Data.Add(newItem);
+            var parentId = LastId;
+            LastId++;
+
+            for (int j = 0; j < 5; j++)
+            {
+                Data.Add(new FlatModel()
+                    {
+                        Id = LastId,
+                        ParentId = parentId,
+                        Title = "    Task " + i + " : " + j.ToString(),
+                        Start = new DateTime(2021, 7, 5 + j),
+                        End = new DateTime(2021, 7, 6 + i + j),
+                        PercentComplete = Math.Round(random.NextDouble(), 2),
+                        Assignee = "    Employee " + j,
+                        Color = Colors[j]
+                    });
+
+                LastId++;
+            }
+        }
+
+        base.OnInitialized();
+    }
+
+    private void UpdateItem(GanttUpdateEventArgs args)
+    {
+        var item = args.Item as FlatModel;
+
+        var foundItem = Data.FirstOrDefault(i => i.Id.Equals(item.Id));
+
+        if (foundItem != null)
+        {
+            foundItem.Title = item.Title;
+            foundItem.Start = item.Start;
+            foundItem.End = item.End;
+            foundItem.PercentComplete = item.PercentComplete;
+        }
+    }
+
+    private void DeleteItem(GanttDeleteEventArgs args)
+    {
+        var item = Data.FirstOrDefault(i => i.Id.Equals((args.Item as FlatModel).Id));
+
+        RemoveChildRecursive(item);
+    }
+
+    private void RemoveChildRecursive(FlatModel item)
+    {
+        var children = Data.Where(i => item.Id.Equals(i.ParentId)).ToList();
+
+        foreach (var child in children)
+        {
+            RemoveChildRecursive(child);
+        }
+
+        Data.Remove(item);
+    }
+
+    class FlatModel
+    {
+        public int Id { get; set; }
+        public int? ParentId { get; set; }
+        public string Title { get; set; }
+        public double PercentComplete { get; set; }
+        public DateTime Start { get; set; }
+        public DateTime End { get; set; }
+        public string Assignee { get; set; }
+        public string Color { get; set; }
+    }
+}
+
+<style>
+    .k-task-single {
+        background-color: none;
+    }
+
+    .k-task-actions {
+        position: absolute;
+        right: 0;
+        top: 14px;
+    }
+
+    .k-task-template {
+        padding: 0px;
+    }
+
+    .k-task-content {
+        display: block;
+    }
+
+    .wrapper {
+        padding-top: 4px;
+        padding-bottom: 4px;
+        padding-left: 8px;
+        padding-right: 8px;
+        border-radius: 4px
+    }
+
+    .task-title {
+        font-size: 18px;
+        font-weight: bold;
+        border-bottom: 1px solid;
+    }
+
+    .task-assignee {
+        font-style: italic;
+    }
+
+    .progress {
+        position: absolute;
+        left: 0;
+        bottom: 0;
+        height: 4px;
+        background: rgba(252, 98, 87, .7);
+    }
+</style>
+````
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