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README.md

iron-list

iron-list displays a virtual, 'infinite' list. The template inside the iron-list element represents the DOM to create for each list item. The items property specifies an array of list item data.

For performance reasons, not every item in the list is rendered at once; instead a small subset of actual template elements (enough to fill the viewport) are rendered and reused as the user scrolls. As such, it is important that all state of the list template be bound to the model driving it, since the view may be reused with a new model at any time. Particularly, any state that may change as the result of a user interaction with the list item must be bound to the model to avoid view state inconsistency.

Important: iron-list must ether be explicitly sized, or delegate scrolling to an explicitly sized parent. By "explicitly sized", we mean it either has an explicit CSS height property set via a class or inline style, or else is sized by other layout means (e.g. the flex or fit classes).

Template model

List item templates should bind to template models of the following structure:

{
  index: 0,     // data index for this item
  item: {       // user data corresponding to items[index]
    /* user item data  */
  }
}

Alternatively, you can change the property name used as data index by changing the indexAs property. The as property defines the name of the variable to add to the binding scope for the array.

For example, given the following data array:

data.json
[
  {"name": "Bob"},
  {"name": "Tim"},
  {"name": "Mike"}
]

The following code would render the list (note the name and checked properties are bound from the model object provided to the template scope):

<template is="dom-bind">
  <iron-ajax url="data.json" last-response="{{data}}" auto></iron-ajax>
  <iron-list items="[[data]]" as="item">
    <template>
      <div>
        Name: <span>[[item.name]]</span>
      </div>
    </template>
  </iron-list>
</template>