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A MountPoint in fritz2 is an anchor of a Flow somewhere in a given structure. It is used as a placeholder when creating the structure. Afterwards, each value appearing on the mounted Flow will be put into the structure at exactly that position.

Most of the time you will use DomMountPoints, allowing you to mount a Flow of Tags to some point in an HTML-subtree you are building (using the render-context). To do so, simply call the bind()-method on some Flow of Tags.

This method creates a new MountPoint as a placeholder and adds it to the current parent-element.

Whenever another Tag appears on the Flow, the DomMountPoint replaces the last Tag with the new one in the child-list of its parent-element (or appends the very first one). No magic here either!

If you need to mix constant Tags and DomMountPoints within one parent und guarantee the order of children set the preserveOrder-parameter when binding:

div {
  div { /* ... */ }
  flowOfTags.bind(preserveOrder = true)
  div { /* ... */ }

Since this temporarily creates a placeholder-element and is not required in most use-cases, it is not the default-behaviour for performance-reasons. Of course, you can also wrap your [DomMountPoint]s in a constant [Tag].

DomMultiMountPoint and AttributeMountPoint work conceptually the same way as DomMountPoints. We will have a closer look at those later.

Distributed by an MIT license.