Sizing the Scale and Events Boxes

In this article we would like to consider scale's and event box's sizing through the example of solving 4 problems:

Problem 1: Events that last less then 1 hour look in the scheduler the same as the 1-hour events do. I want short events to fit the scale.

Problem 2: Events that last less then 1 hour and occur at the different times but within one hour overlap. I want such short events not to overlap.

Problem 3: I change the scale unit height and want to change the striped background accordingly.

Problem 4: The default scale spacing is 1 hour. I want to change it and make, for example, 30 minutes.

How to make short events fit the scale

First, let's learn the default behavior of the events boxes:

  • the default scale unit height is 44px (or the hour height).
  • the minimum height of the event box is 44px.
  • events that last less than 1 hour take the size of 44px. So, 15-minute and 1-hour events will look the same in the scheduler.
  • events that last more than 1 hour take their height according to the side scale (assuming that 1 hour is equal to 44px - a 90-minutes event will take 63px in height).

Let's assume you want 30-minute events to fit the scale. Then you have 2 solutions:

  • To increase the height of the scale's unit
  • To customize the event box


Solution 1. Changing the scale unit's height

To change the height of the scale's unit you should use the hour_size_px configuration option.

For example, to increase the unit's height twice you should call the option as in:

scheduler.config.hour_size_px = 88;

Now the scale unit's height is 88 px and the 30-minute event taking 44px will occupy the 30-minute height, as it's needed.

Related sample:  Changing the Y-Axis step

Solution 2. Customizing the event box

To customize the events boxes display, you should use the renderEvent method that allows you to set your own template for the events.

scheduler.renderEvent = function(container, ev) {
    //your customizing code

Read the details in the related chapter - Custom Event's Box.

Related sample:  Custom event box

Preventing short events from overlapping

To display short events separately and eliminate a possibility of their overlapping, you should set the separate_short_events option to true:

scheduler.config.separate_short_events = true;


How to change the background according to the set scale

The scheduler background is set by a mere image.

To change the background image you should redefine the related css class which is .dhx_scale_holder:

.dhx_scale_holder {
     background-image: url("imgs/myNewImage.png");


How to change the scale spacing

To change the default scale spacing you need to rewrite the hour_scale template.

To make the scale spacing equal to 30 minutes you can rewrite the template as follows:

var format ="%H:%i");
var step = 30;
scheduler.templates.hour_scale = function(date){
    var html="";
    for (var i=0; i<60/step; i++){
        html+="<div style='height:22px;line-height:22px;'>"+format(date)+"</div>";
        date =,step,"minute");
    return html;


Related samples:

Related sample:  Custom Y-Axis

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