How to Customize Expand/Collapse Icon Size in JavaScript Diagram?

The JavaScript Diagram allows to expand/collapse the subtrees of a layout. The node’s isExpanded property allows you to expand/collapse the subtrees of a layout. The node’s isExpanded property enables you to expand/collapse its children. The following code example demonstrates how to expand/collapse the children of a node.
The icon for expand and collapse can be customized by setting the shape property to one of the following options: “None,” “Plus,” “Minus,” “ArrowUp,” “ArrowDown,” “Path,” or “Template.” To increase the size of the icon, you can adjust the height and width properties of the expand/collapse icon.

function getNodeDefaults(obj, diagram) {
   obj.expandIcon = {
     height: 20,
     width: 20,
     shape: 'Minus',
     fill: 'lightgray',
     offset: {
       x: 0.5,
       y: 0.85,
     },
     borderWidth: 3,
   };
   obj.collapseIcon.offset = {
     x: 0.5,
     y: 0.85,
   };
   obj.collapseIcon.height = 20;
   obj.collapseIcon.width = 20;
   obj.collapseIcon.shape = 'Plus';
   obj.borderColor = 'white';
   obj.backgroundColor = '#6BA5D7'; 
   obj.style = {
     fill: 'transparent',
     strokeWidth: 2,
   };
   return obj;
 } 

Sample: https://stackblitz.com/edit/n883tq-cikger?file=index.js

Conclusion
I hope you enjoyed learning how to customize the expand/collapse icon size in JavaScript Diagram.
You can refer to our JavaScript Diagram feature tour page to learn about its other groundbreaking feature representations and documentation, and how to quickly get started with configuration specifications. You can also explore our JavaScript Diagram example to understand how to create and manipulate data.
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