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In Dash, by Plotly helping section in Callbacks https://dash.plotly.com/interactive-graphing it is stated that:

Dash components are described declaratively by a set of attributes. All of these attributes can be updated by callback functions

Using the definition of What is the difference between properties and attributes in HTML?:

  • Attributes: Attributes are defined by HTML. They initialize DOM properties and then they are done.
  • Properties: Properties are defined by the DOM (Document Object Model). After DOM has been fully initialized these properties can change.

It is logic and reasonable to say that Dash Callbacks retrieve a specific DOM object by its id, and 'read' its property (not the HTML attribute that initialized it). Example: it is possible to have an Input Callback listening to a graph figure 'hoverData' change property.

If this assumption is true:

So basically dash Callbacks operate after the DOM has been initialized, also again they operate on DOM properties not HTML attributes.

So again if true case this could be clearly stated in documentation which would improve to avoid developers confusing this sometimes not very obvious terms.

Michel
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Francisco Costa
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1 Answers1

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Have found an answer, dash callbacks work with DOM Properties which is more accurate than saying HTML attributes.

Francisco Costa
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