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---
title: onLoading
name: options-onloading
---
The onLoading parameter is called when the tree data is loading. This gives us the opportunity to display a loading signal.
Callback looks like this:
```js
function (is_loading, node, $el)
```
* **is_loading**: boolean
* true: data is loading
* false: data is loaded
* **node**:
* Node: if a node is loading
* null: if the tree is loading
* **$el**:
* if a node is loading this is the `li` element
* if the tree is loading is the `ul` element of the whole tree
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