Inspire Tree is a performance-driven javascript-based UI tree component, built for the modern web. Inspired by our need for one - the only existing solution which met our feature needs was a nightmare to develop for.
- Robust API.
- Events everywhere.
- No required external dependencies.
- Load data directly, via promises, or callbacks.
- Load child nodes upfront or dynamically (or a mix of both).
- Tri-state checkboxes (optional).
- Multiselect (optional).
- Inline editing (optional).
- Search by plain string, RegExp, custom matcher, or external resources (optional).
- Sorting (optional).
- AMD and CommonJS support (RequireJS, Node/Webpack).
- Supports multiple instances on a single page.
- API methods to simplify moving nodes between instances.
- Solid coverage by automated tests.
- Built for IE10+.
- Can be replaced with a custom renderer (see details below) for native framework support.
- Virtual DOM for blazing fast change rendering.
- Valid HTML structure.
- Clean and easy-to-override CSS.
- Modular SASS for custom compilation.
- Keyboard navigation.
- Custom context menu (optional).
- Drag and Drop between tree instances (optional).
- Node:
npm install --save inspire-tree
or - Bower
bower install --save inspire-tree
The dist
directory contains several versions:
bundled
- Includes stripped-down version of lodash, has no external dependencies.core
- Excludes DOM rendering logic, for those using a custom renderer.min
- Minified source for production use.
In most use-cases you need to provide a target DOM element and a source of data:
var tree = new InspireTree({
target: '.tree',
data: $.getJSON('sample-data.json')
});
Data objects must have at least a text
property. Additional properties are listed below in "Node Configuration".
If you're using a custom DOM renderer (see below), the target
property is optional.
When you define a data loader in the InspireTree constructor, the promise isn't accessible, and this can consume errors that you should be aware of. There are a few choices:
- If
data
was provided to the constructor, InspireTree will automatically throw any errors. However, errors from future calls will only be available through theload()
method's promise or thedata.loaderror
event. - Listen to the
data.loaderror
event. All load errors, including initial errors, emit this event. - Load the data after tree initialization:
tree.load(data).catch(function(err) { ... })
.
- allowLoadEvents - Array of state-change events to fire for pre-set states.
- checkbox
- autoCheckChildren - Automatically check/uncheck children when parent toggled.
- contextMenu - Array of choices (object with
text
property,handler
function) for a custom context menu. - data - An array, promise, or callback function.
- deferredLoading - Enable deferred loading. (See "Deferrals" section below.)
- dom
- autoLoadMore - Automatically triggers "Load More" links on scroll. Used with deferrals.
- deferredRendering - Only render nodes as the user clicks to display more. (See "Deferrals" section below.)
- nodeHeight - Height (in pixels) of your nodes. Used with deferrals, if
pagination.limit
not provided. - showCheckboxes - Show checkbox inputs.
- dragTargets - Array of other tree elements which accept drag/drop.
- editable - Allow inline editing.
- editing (defaults to true if
editable
is true)- add - Allow user to add nodes.
- edit - Allow user to edit existing nodes.
- remove - Allow user to remove nodes.
- nodes
- resetStateOnRestore - Reset node state to defaults when restored.
- pagination
- limit - How many nodes are rendered/loaded at once. Used with deferrals. Defaults to nodes which fit in the container.
- renderer - Function which returns a custom renderer (see below).
- search
- matcher - Custom search executor (for custom/external handling of entire search). Must be a function which accepts a
query
and resolve/reject arguments. - matchProcessor - Custom handler for search matches. Must be a function which accepts a
TreeNodes
argument.
- matcher - Custom search executor (for custom/external handling of entire search). Must be a function which accepts a
- selection
- allow - Dynamically determine
selectable
boolean for a node. - autoDeselect - Prevent automatic deselection.
- autoSelectChildren - Auto-select children when a parent node is selected, regardless of their visibility.
- disableDirectDeselection - Disallow deselecting a node by clicking on it while selected.
- mode -
default
orcheckbox
. Checkbox mode auto-selects children, doesn't auto deselect. - multiple - Allow multiple nodes to be selected at a time.
- require - Require at least one selected node.
- allow - Dynamically determine
- showCheckboxes - Show checkboxes in DOM. (Defaults to true if
selection.mode
=== 'checkbox'). - sort - Property to sort by, or a custom sort function.
- tabindex - Define a tab index for the tree container (used for key nav).
- target - An Element, selector, or jQuery object.
- text - Text used in display.
- id - Unique ID. If missing, one will be generated.
- children - An array of child nodes.
- a.attributes - Custom attributes for this node's
a
. - li.attributes - Custom attributes for this node's root
li
. - itree - An object used to describe initial tree values:
- icon - Custom icon for the anchor.
- state.collapsed - Set initial collapsed state.
- state.focused - Node has UI focus.
- state.hidden - Set initial visibility.
- state.loading - Dynamic load of children in progress.
- state.removed - Soft removed. Never shown until restored.
- state.selectable - Allow selection.
- state.selected - Set initial selection.
Events are triggered to inform you of changes or user interaction. Listeners are always registered on tree.on
. Methods available in our event system are described at EventEmitter2.
tree.on('node.click', function(event, node) {
// node clicked!
});
- children.loaded -
(TreeNode node)
- Children were dynamically loaded for a node. - data.loaded -
(Array nodes)
- Data has been loaded successfully (only for data loaded via xhr/callbacks). - data.loaderror -
(Error err)
- Loading failed. - model.loaded -
(Array nodes)
- Data has been parsed into an internal model. - node.added -
(TreeNode node)
- Node added. - node.blurred -
(TreeNode node)
- Node lost focus. - node.checked -
(TreeNode node)
- Node checked. - node.click -
(Event event, TreeNode node)
- User clicked node. - node.collapsed -
(TreeNode node)
- Node collapsed. - node.contextmenu -
(Event event, TreeNode node)
- User right-clicked node. - node.dblclick -
(Event event, TreeNode node)
- User double-clicked node. - node.deselected -
(TreeNode node)
- Node deselected. - node.dropin -
(TreeNode node)
- Tree has received a new node via drop. - node.dropout -
(TreeNode node), (Element elem)
- Node dropped into a valid target. - node.edited -
(TreeNode node), (string oldValue), (string newValue)
- Node text was altered via inline editing. - node.expanded -
(TreeNode node)
- Node expanded. - node.focused -
(TreeNode node)
- Node focused. - node.hidden -
(TreeNode node)
- Node hidden. - node.paginate -
(TreeNode context), (Object pagination) (Event event)
- Nodes were paginated. Context is undefined when for the root level. - node.property.changed -
(TreeNode node), (String property), (Mixed oldValue), (Mixed) newValue)
- A node's root property has changed. - node.removed -
(object node)
- Node removed. - node.restored -
(TreeNode node)
- Node restored. - node.selected -
(TreeNode node)
- Node selected. - node.state.changed -
(TreeNode node), (String property), (Mixed oldValue), (Mixed) newValue)
- A node state boolean has changed. - node.shown -
(TreeNode node)
- Node shown. - node.softremoved -
(TreeNode node)
- Node soft removed. - node.unchecked -
(TreeNode node)
- Node unchecked.
In rare cases, you may need to override our default DOM event handlers. To assist with this, those events provide a preventTreeDefault
method.
tree.on('node.click', function(event, node) {
event.preventTreeDefault(); // Cancels default listener
});
In these cases, it will be up to you to ensure any further logic has been implemented.
However, the original handler is passed as an argument, which still allows you to execute it when you're ready.
tree.on('node.click', function(event, node, handler) {
event.preventTreeDefault(); // Cancels default listener
// do some custom logic
handler(); // call the original tree logic
});
Only DOM-based events support this: node.click, node.dblclick, node.contextmenu
Each Inspire Tree instance returns an API object.
All methods not specific to existing node/s are found directly on the API:
tree.addNode({ text: 'Example' });
TreeNode
Each incoming javascript object is wrapped as a TreeNode
, which aliases methods useful on a single node.
tree.node('a-unique-id').select();
TreeNodes
Multiple TreeNode
s are contained within an Array-like object.
TreeNodes
maps several TreeNode methods so you can invoke them on all nodes in the collection, or recursively
down the nodes and their children.
Expands only root nodes inside this collection:
tree.nodes().expand();
Expands root nodes and their children inside this collection:
tree.nodes().expandDeep();
Global TreeNodes Methods
Most TreeNodes
methods are mapped to the tree
instance to ease working with all nodes. Instead of using tree.nodes().someMethod()
you can
use tree.someMethod()
.
For those working with massive datasets, InspireTree offers several additional features to help reduce initial load burdens.
Deferred Rendering progressively renders loaded nodes as the user scrolls or clicks a Load More link.
To work properly, you need to enable dom.deferredRendering
in the configuration.
A "Load More" link will show at the bottom of each section which has more nodes than are initially allowed.
Deferred Loading works exactly like deferred rendering, except nodes are loaded in paginated chunks.
- Enable
deferredLoading
in the config. - Pass a count of total nodes to the
data
callback. This way, inspire tree knows how many nodes remain.
data: function(node, resolve, reject, pagination) {
// nodes = subset of total nodes, 1000 = total rows
resolve(nodes, 1000);
}
- Set
pagination.limit
in the config if the default doesn't suit you. - A fourth object,
pagination
is passed to thedata
callback. It contains the current limit/total for the context being loaded. Ifnode
is undefined, the pagination object refers to root level nodes, otherwise it refers to children of thenode
.
Note: Deferred rendering and loading may be used together but there's no reason to.
While Inspire Tree comes with a super-fast virtual DOM engine for element rendering, there are times when you need your own. Useful for integrating with existing engines like Angular, React, etc.
- Use only the
inspire-tree-core.js
file. This excludes our DOM code. - Set the
renderer
option to a function which returns an object with the following methods. If/how you implement them depends on your rendering engine.
- applyChanges - Called when core has altered something which will impact rendering.
- attach - Called on load to attach to a given HTML element.
- batch - Pause live rendering because multiple changes are coming.
- end - Batch changes are done, rendering may resume.
Again, you may not need to implement these depending on how you render the data.
Your custom rendering function will be given the tree
instance as an argument.
var tree = new InspireTree({
target: '.tree',
data: [],
renderer: function(tree) {
return {
applyChanges: function() {},
attach: function() {},
batch: function() {},
end: function() {}
}
}
});
- available - Node is not soft-removed or hidden.
- deepest - Nodes without any children.
- visible - Node is visible to the user. It's ancestors are not hidden/collapsed/removed.
Recursing Flattened Arrays
Methods which return flattened arrays intentionally leave their hierarchy pointers intact. This means that while you have a flat array, you also have reference to parent/child elements. This can interfere with recursive methods because they'll iterate both the array elements and their children.
This will only impact a small number of methods. For example:
tree.available().deepest();
... will duplicate nodes because deepest
iterates the array and recurses through children.
Possible solutions:
- Reverse the order:
tree.deepest().available()
- Avoid flattened arrays:
tree.available(true).deepest()