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kb(scheduler): add article how to display an indicator at the current…
… time closes telerik/telerik.web.ui/issues#1982
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knowledge-base/scheduler-display-indicator-at-the-current-time.md
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--- | ||
title: Display an indicator at the current time | ||
description: Using JavaScript to display an indicator at the current time when the Scheduler is configured to represent a 24 hours Timeline view. | ||
type: how-to | ||
page_title: Display an indicator at the current time in Timeline view | Scheduler | ||
slug: scheduler-display-indicator-at-the-current-time | ||
res_type: kb | ||
--- | ||
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## ENVIRONMENT | ||
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<table> | ||
<tr> | ||
<td>Product</td> | ||
<td>Telerik WebForms Scheduler for ASP.NET AJAX</td> | ||
</tr> | ||
</table> | ||
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## DESCRIPTION | ||
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Using JavaScript to display an indicator at the current time when the Scheduler is configured to represent a 24 hours Timeline view. | ||
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![Indicator of the current time in TimeLine view mode](images/scheduler-timeline-view-line.png "Indicator of the current time in TimeLine view mode") | ||
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## SOLUTION | ||
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First, configure the Scheduler to have 24 time slots in the Timeline view: | ||
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- Set the **NumberOfSlots** property to **24**. | ||
- Set the **ColumnHeaderDateFormat** property to **HH:mm** and the **SlotDuration** to **01:00:00** | ||
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Example | ||
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````ASPX | ||
<telerik:RadScheduler runat="server" ID="RadScheduler1" GroupBy="Speaker" GroupingDirection="Vertical" DataSourceID="EventsDataSource" | ||
DataKeyField="ID" DataSubjectField="Description" DataStartField="StartDate" DataEndField="EndDate" DataRecurrenceField="RecurrenceRule" | ||
DataRecurrenceParentKeyField="RecurrenceParentID" OnResourceHeaderCreated="RadScheduler1_ResourceHeaderCreated"> | ||
<TimelineView ColumnHeaderDateFormat="HH:mm" SlotDuration="01:00:00" NumberOfSlots="24" EnableExactTimeRendering="true" /> | ||
<ResourceTypes> | ||
<telerik:ResourceType KeyField="SpeakerID" Name="Speaker" TextField="FullName" ForeignKeyField="SpeakerID" | ||
DataSourceID="SpeakersDataSource"></telerik:ResourceType> | ||
</ResourceTypes> | ||
<TimeSlotContextMenuSettings EnableDefault="true"></TimeSlotContextMenuSettings> | ||
<AppointmentContextMenuSettings EnableDefault="true"></AppointmentContextMenuSettings> | ||
</telerik:RadScheduler> | ||
```` | ||
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Create an event listener using the [Sys.Application.load Event](https://learn.microsoft.com/en-us/previous-versions/bb383829(v=vs.100)?redirectedfrom=MSDN) and run the following JS code in the event handler, which creates a vertical line at the current time. | ||
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Example | ||
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````JS | ||
function markCurrentTime() { | ||
var scheduler = $find("<%= RadScheduler1.ClientID %>"); // Find your RadScheduler control | ||
var schedulerTable = $(scheduler.get_element()).find('.rsAllDayTable'); // Find the scheduler table | ||
var schedulerOffset = schedulerTable.offset().left; // Get the offset of the scheduler table | ||
var schedulerWidth = schedulerTable.width(); // Get the width of the scheduler table | ||
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var currentTime = new Date(); // Get the current time | ||
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var minutesSinceStartOfDay = currentTime.getHours() * 60 + currentTime.getMinutes(); // Calculate the position of the current time within the scheduler | ||
var pixelsPerMinute = schedulerWidth / (24 * 60); // Assuming your scheduler shows a full 24-hour day | ||
var currentPosition = minutesSinceStartOfDay * pixelsPerMinute; | ||
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$(".current-time-indicator").remove(); // Remove the class so that it doesn't create multiple instances of lines | ||
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var schedulerDate = scheduler.get_selectedDate(); // Get the selected date | ||
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var verticalHeader = $(".rsVerticalHeaderWrapper")[0].getBoundingClientRect() // Get the information about the size of the element | ||
var width = verticalHeader.width; // Get the width of the Resource Header | ||
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if (schedulerDate.getDate() === currentTime.getDate() && | ||
schedulerDate.getMonth() === currentTime.getMonth() && | ||
schedulerDate.getFullYear() === currentTime.getFullYear()) { // Check to see if it's for today's date | ||
var $currentTimeIndicator = $('<div></div>') // Create the vertical line element | ||
.addClass('current-time-indicator') | ||
.css({ | ||
'position': 'absolute', | ||
'top': 0, | ||
'left': schedulerOffset + currentPosition - width, // Subtract the widthn of the vertical header | ||
'height': schedulerTable.height(), | ||
'width': '5px', | ||
'background-color': 'red' | ||
}); | ||
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schedulerTable.append($currentTimeIndicator); // Append the line to the scheduler | ||
setTimeout(markCurrentTime, 60000); | ||
} | ||
} | ||
Sys.Application.add_load(markCurrentTime); // Call the function on when the page is fully loaded | ||
```` | ||
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