gm.dragDrop

Angular directives to add native, simple, data-driven drag and drop functionality.

Include

gm.dragDrop is available on both NPM and Bower:

$ npm/bower install gm.drag-drop --save

Use

First, add the gm.dragDrop module to your app's dependencies:

var app = angular.module('myApp', ['gm.dragDrop']);

There are 3 directives included in the module: gmDraggable, gmOnDrop, and gmOnHover. Adding the gmDraggable directive to an element makes it draggable. Adding the gmOnDrop directive to an element sets it as a drop zone for the draggable element. Set the value of gmOnHover or gmOnDrop to a function that will be called when the dragged element is over or released on an element, respectively. Set the value of gmDraggable to the object you want to be passed to gmOnDrop.

Items with gmDraggable set can also assign a function to a gmOnInvalidDrop attribute, which will be called if the item is dropped anywhere but a valid drop zone.

Sample controller:

...

this.data = { key: "number", value: "1" }

this.onHover = function(_data, mouseEvent) {
    console.log('hovering', _data.key, _data.value); // hovering number 1
}

this.onDrop = function(_data) {
    console.log('dropped', _data.key, _data.value); // dropped number 1
}

this.invalidDrop = function(_data) {
    console.log('invalid drop', _data.key, _data.value); // invalid drop number 1
}

...

Sample template:

<span gm-draggable="$ctrl.data" gm-on-invalid-drop='$ctrl.invalidDrop'>Number {{data.value}}</span>
<div style='width:30%; float:right; padding:50px; border:solid black 1px' gm-on-drop="$ctrl.onDrop" gm-on-hover='$ctrl.onHover'>Drop Area</div>

Style

You can define style for three classes, .gm-drag-element, .gm-dragging and .gm-dropping, to set the style of the original element that was clicked, the element being dragged, and the drop zone element when the mouse hovers over it while dragging, respectively.

Drop Zones

You can also define a gm-drop-zone attribute on both draggable elements and drop zones to control where elements can be dropped. Functions assigned to an element's gm-on-drop or gm-on-hover attributes will only be called when its gm-drop-zone attribute matches the dragged element's gm-drop-zone attribute.

Sample template using drop zones:

<span gm-draggable="$ctrl.data" gm-drop-zone='1'>Number {{data.value}}</span>
<div style='width:30%; float:right; padding:50px; border:solid black 1px' gm-on-drop="$ctrl.onDrop" gm-drop-zone='2'>Cannot Drop Here</div>
<div style='width:30%; float:right; padding:50px; border:solid black 1px' gm-on-drop="$ctrl.onDrop" gm-drop-zone='1'>Drops Allowed Here</div>

Handles

You can add a child element to a gm-draggable element with the tag name or class gm-drag-handle to have it act as the drag 'handle' if you don't want the entire element to respond to dragging.

Sample template using a drag handle:

<span gm-draggable="$ctrl.data">
	<span class="gm-drag-handle">[Dragging only works if you click here]</span> Number {{data.value}}
</span>

Demo

http://plnkr.co/edit/Gz4FuH?p=preview