Create the `simulateDragDrop` function which can be used to simulate clicking and dragging one DOM Node onto another

native_js_drag_and_drop_helper.js

function simulateDragDrop(sourceNode, destinationNode) {
    var EVENT_TYPES = {
        DRAG_END: 'dragend',
        DRAG_START: 'dragstart',
        DROP: 'drop'
    }

    function createCustomEvent(type) {
        var event = new CustomEvent("CustomEvent")
        event.initCustomEvent(type, true, true, null)
        event.dataTransfer = {
            data: {
            },
            setData: function(type, val) {
                this.data[type] = val
            },
            getData: function(type) {
                return this.data[type]
            }
        }
        return event
    }

    function dispatchEvent(node, type, event) {
        if (node.dispatchEvent) {
            return node.dispatchEvent(event)
        }
        if (node.fireEvent) {
            return node.fireEvent("on" + type, event)
        }
    }

    var event = createCustomEvent(EVENT_TYPES.DRAG_START)
    dispatchEvent(sourceNode, EVENT_TYPES.DRAG_START, event)

    var dropEvent = createCustomEvent(EVENT_TYPES.DROP)
    dropEvent.dataTransfer = event.dataTransfer
    dispatchEvent(destinationNode, EVENT_TYPES.DROP, dropEvent)

    var dragEndEvent = createCustomEvent(EVENT_TYPES.DRAG_END)
    dragEndEvent.dataTransfer = event.dataTransfer
    dispatchEvent(sourceNode, EVENT_TYPES.DRAG_END, dragEndEvent)
}

Amazing! Thank you for this script, I finally have a test passing. I adapted it slightly to reflect the exact events I was using in my drag/drop component (I also needed 'dragover').

Hi Marina,
Is there a solution for the same when using selenium ? The Drag and Drop action doesn't work in selenium for html5 ( firefox driver ). I wish to code a custom drag and drop action using java for html5; I have tried these 3 methods and none of them work, (a) Trying to click-and-hold then release onto the drop co-ordinates (b) Using iframes ( works only with frames, but I want a general solution ) (c) Saving all the drag and drop helper code in a js file and then calling this in the main java program ( this seems to be the most hyped solution to this problem in stackoverflow and github; doesn't work or maybe I messed up ).
Is there a work around to this ? Using selenium in RedwoodHQ, custom actions coded in java , any help would be appreciated.

cool beans

@pidupuis - did you resolve the duplication of elements?
I have the similar issue with the script above..

@elenatosheva - Not sure what your exact setup is but i was getting the same duplication issue when using https://github.com/marceljuenemann/angular-drag-and-drop-lists.
This was due to the dnd-moved callback not firing so not removing the original element.
Looking at the source code this is due to dropEffect of move not being specified in the dataTransfer object.
Adding dropEffect: 'move' to the object fixed the issue, however this has only been tested on chrome 54 / linux.

        event.dataTransfer = {
            data: {
            },
            setData: function(type, val) {
                this.data[type] = val
            },
            getData: function(type) {
                return this.data[type]
            },
            dropEffect: 'move'
        }

@leesaxby - Thank very much for the reply. I'm using protractor on windows/chrome to test an angular application, which
have html 5 drag and drop implementation.
I'll try your suggestion soon in the coming days, because now we are busy with testing :(
Otherwise I searched everywhere for a similar problem, but to no avail :(
I'll inform you about the results.

Regards,
Elena

Many thanks, @leesaxby , your solution appears to work in my case too.

Now I can continue writing drag&drop tests.

Regards,
Elena

@leesaxby @elenatosheva
While using above gist to automate https://github.com/marceljuenemann/angular-drag-and-drop-lists only click is happening on source div.

Issue
Even after event.dataTransfer.setData(mimeType, angular.toJson(item));

dataTransfer.types is not set or probably not allowed to read in dragstart and drop event

Observation : during manual drag drop dragstart event

dataTransfer {dropEffect: "none", effectAllowed: "move", items: DataTransferItemList, types: Array(1), files: FileList}
    dropEffect:"move"
    effectAllowed:"move"
    files:FileList
    items:DataTransferItemList
    types:Array(0)
    __proto__:DataTransfer

DataTransferItemList {0: DataTransferItem, length: 1}
    length: 0
    __proto__: DataTransferItemList

 DataTransferItem {kind: "string", type: "application/x-dnd"}
    kind: ""type: ""
    __proto__: DataTransferItem

**Observation : when using above script - custom event **

dataTransfer:Object
    data:Object
        application/x-dnd:"[{"id":"706","title":"Ab 2","drag":false,"selected":true}]"
        __proto__:Object
    dropEffect:"move"
    effectAllowed:"move"
   getData:function (type)
    setData:function (type,val)
    files:Object
    items:Object
    types:Array(0)	

I am using

	 var event = new CustomEvent("CustomEvent", {"cancelable": true})
        event.initCustomEvent(type, true, true, null);
        event.dataTransfer = {
            data: {
            },
            setData: function(type,val) {
                this.data[type] = val
            },
            getData: function(type) {
                return this.data[type]
            },
			dropEffect: 'move',
			effectAllowed:'move',
			types: [],
			items:{},
			files:{}
				
			
        }

Solved above issue by changing . Now working fine in chrome for ruby for angular drag drop lists

    setData: function(type,val) {
        this.data[type] = val
        this.types[0] = type
    }

it does not work with dragular:
http://valor-software.com/ng2-dragula/

     p_Login.openUrl("http://valor-software.com/ng2-dragula/");
            let ele1=element(by.xpath("//example-app//div[contains(text(),'You can move')]"));
            let ele2=element(by.xpath("//example-app//div[contains(text(),'This is the default use case')]/.."));
            browser.driver.executeScript(dragAndDropFn, ele1.getWebElement(), ele2.getWebElement());

As of angular-drag-and-drop-lists version >= 2.0.0 the above work around no longer seems to work as is, due to the directive using a custom MIME type.

Iv'e forked the gist and updated it, allowing drag and drop of html elements in protractor tests.
https://gist.github.com/leesaxby/fabc59c82569a225f8d833b5924e23c6

Basic app to test the fix.
https://github.com/leesaxby/protractor-drag-drop/blob/master/README.md

@druska What is the licensing on this code?

Can someone give me an example how to use it in Python script please

Thank you, the solution above works fine in Protractor

Amazing! Thank you for this script, I finally have a test passing. I adapted it slightly to reflect the exact events I was using in my drag/drop component (I also needed 'dragover').

Can you share the dragover event changes done in javascript?

Brilliant solution. Thanks a lot.
I was simulating dropping files onto Facebook's chat window and adding files: [] property to event.dataTransfer with arbitrary File() objects actually upload these files.

Hi! I am trying to use this with Sortable.js but nothing happens. No errors and the drag and drop doesn't happen. Is this supposed to work with current browsers?

Hi! I am trying to use this with Sortable.js but nothing happens. No errors and the drag and drop doesn't happen. Is this supposed to work with current browsers?

Same here. Doesn't seem to work with Sortable.js.

Great. Works fine with selenium + java

This is amazing! Works perfectly with Selenium JavascriptExecutor =)

Can anybody please help me to know how can we drag and drop by offset using Javascript executor in Python?

how to drag element to offset?

Thanks !!

If someone is doing this in 2021, and is having trouble with data transfer object (in the above example dataTransfer object is a very trimmed down version of the actual object in 2021, so some of the application implementation could reject this object) then the following would work. Just replaced the Custom event with DragEvent and used the actual DataTransfer object instead of the dummy one.

function simulateDragDrop(sourceNode, destinationNode) {
    var EVENT_TYPES = {
        DRAG_END: 'dragend',
        DRAG_START: 'dragstart',
        DROP: 'drop'
    }

    function createCustomEvent(type, dataTransfer) {
        var event = new DragEvent(type,  {dataTransfer});
        return event
    }

    function dispatchEvent(node, type, event) {
        if (node.dispatchEvent) {
            return node.dispatchEvent(event)
        }
        if (node.fireEvent) {
            return node.fireEvent("on" + type, event)
        }
    }

    var event = createCustomEvent(EVENT_TYPES.DRAG_START, new DataTransfer())
    dispatchEvent(sourceNode, EVENT_TYPES.DRAG_START, event)

    var dropEvent = createCustomEvent(EVENT_TYPES.DROP, event.dataTransfer)
    dispatchEvent(destinationNode, EVENT_TYPES.DROP, dropEvent)

    var dragEndEvent = createCustomEvent(EVENT_TYPES.DRAG_END, event.dataTransfer)
    dispatchEvent(sourceNode, EVENT_TYPES.DRAG_END, dragEndEvent)
}

I was using Selenide and Kotlin. Also had to add a few extra props for my page to the transfer event and a few extra events:
It's both usable with SelenideElements or css selectors if you keep the commented line in the script:
The script:

function simulateDragDrop(sourceNode, destinationNode) {
    var EVENT_TYPES = {
        MOUSE_DOWN: 'mousedown',
        MOUSE_UP: 'mouseup',
        DRAG: 'drag',
        DRAG_END: 'dragend',
        DRAG_OVER: 'dragover',
        DRAG_START: 'dragstart',
        DROP: 'drop'
    }

    function createCustomEvent(type) {
        var event = new CustomEvent("CustomEvent")
        event.initCustomEvent(type, true, true, null)
        event.dataTransfer = {
            dropEffect: 'move',
            effectAllowed: 'all',
            files :[],
            items: [],
            types: [],
            data: {
            },
            setData: function(type, val) {
                this.data[type] = val
                this.items.push(val);
                this.types.push(type);
            },
            getData: function(type) {
                return this.data[type]
            }
        }
        return event
    }

    function dispatchEvent(node, type, event) {
        if (node.dispatchEvent) {
            return node.dispatchEvent(event)
        }
        if (node.fireEvent) {
            return node.fireEvent("on" + type, event)
        }
    }


    var mouse_down = createCustomEvent(EVENT_TYPES.MOUSE_DOWN)
    dispatchEvent(sourceNode, EVENT_TYPES.MOUSE_DOWN, mouse_down)

    var event = createCustomEvent(EVENT_TYPES.DRAG_START)
    dispatchEvent(sourceNode, EVENT_TYPES.DRAG_START, event)

    var drag = createCustomEvent(EVENT_TYPES.DRAG)
    dispatchEvent(sourceNode, EVENT_TYPES.DRAG, drag)

    drag_over = createCustomEvent(EVENT_TYPES.DRAG_OVER)
    drag_over.dataTransfer = event.dataTransfer
    dispatchEvent(destinationNode, EVENT_TYPES.DRAG_OVER, drag_over)

    var dropEvent = createCustomEvent(EVENT_TYPES.DROP)
    dropEvent.dataTransfer = event.dataTransfer
    dispatchEvent(destinationNode, EVENT_TYPES.DROP, dropEvent)

    var dragEndEvent = createCustomEvent(EVENT_TYPES.DRAG_END)
    dragEndEvent.dataTransfer = event.dataTransfer
    dispatchEvent(sourceNode, EVENT_TYPES.DRAG_END, dragEndEvent)

    var mouse_up = createCustomEvent(EVENT_TYPES.MOUSE_UP)
    dispatchEvent(sourceNode, EVENT_TYPES.MOUSE_UP, mouse_up)
    return 1
}
// simulateDragDrop(document.querySelector(arguments[0]),document.querySelector(arguments[1]))
simulateDragDrop(arguments[0],arguments[1])

usage:

 val file = File("src/test/resources/js_drag_and_drop.js")
 val js = file.readText()
 Selenide.executeJavaScript<String>(js, loginIdCard, uniqueIdDropField)

@csbalazs-inst Thank you very much!!!

@mufasalg0 you can use the script above, save it in your repo and read the file into a String object.
I don't know exactly what stack you're using but selenium or most drivers have options for executing javascript directly.
look for "selenium javascript executor" for example.

@Praveer-grover
Hi, is it possible to upgrade this script and move the element to the given coordinates?

If someone is doing this in 2021, and is having trouble with data transfer object (in the above example dataTransfer object is a very trimmed down version of the actual object in 2021, so some of the application implementation could reject this object) then the following would work. Just replaced the Custom event with DragEvent and used the actual DataTransfer object instead of the dummy one.

function simulateDragDrop(sourceNode, destinationNode) {
    var EVENT_TYPES = {
        DRAG_END: 'dragend',
        DRAG_START: 'dragstart',
        DROP: 'drop'
    }

    function createCustomEvent(type, dataTransfer) {
        var event = new DragEvent(type,  {dataTransfer});
        return event
    }

    function dispatchEvent(node, type, event) {
        if (node.dispatchEvent) {
            return node.dispatchEvent(event)
        }
        if (node.fireEvent) {
            return node.fireEvent("on" + type, event)
        }
    }

    var event = createCustomEvent(EVENT_TYPES.DRAG_START, new DataTransfer())
    dispatchEvent(sourceNode, EVENT_TYPES.DRAG_START, event)

    var dropEvent = createCustomEvent(EVENT_TYPES.DROP, event.dataTransfer)
    dispatchEvent(destinationNode, EVENT_TYPES.DROP, dropEvent)

    var dragEndEvent = createCustomEvent(EVENT_TYPES.DRAG_END, event.dataTransfer)
    dispatchEvent(sourceNode, EVENT_TYPES.DRAG_END, dragEndEvent)
}

@Praveer-grover this changes in this script are not moving elements for me, is it possible that you can confirm this method is still functional?

DragEvent

function simulateDragDrop(sourceNode, destinationNode) {
    var EVENT_TYPES = {
        DRAG_END: 'dragend',
        DRAG_START: 'dragstart',
        DROP: 'drop'
    }

    function createCustomEvent(type, dataTransfer) {
        dataTransfer.data = {};
        dataTransfer.setData = function(type,val){this.data[type] = val};
        dataTransfer.getData = function(type){return this.data[type]};
        dataTransfer.dropEffect = 'move';
        dataTransfer.effectAllowed = 'move';
        dataTransfer.types = [];
        dataTransfer.items = {};
        dataTransfer.files = {};
        var event = new DragEvent(
            type,  
            {
                bubbles: true,
                cancelable: true,
                dataTransfer: dataTransfer
            });
        return event
    }

    function dispatchEvent(node, type, event) {
        if (node.dispatchEvent) {
            return node.dispatchEvent(event)
        }
        if (node.fireEvent) {
            return node.fireEvent("on" + type, event)
        }
    }

    var event = createCustomEvent(EVENT_TYPES.DRAG_START, new DataTransfer())
    dispatchEvent(sourceNode, EVENT_TYPES.DRAG_START, event)

    var dropEvent = createCustomEvent(EVENT_TYPES.DROP, event.dataTransfer)
    dispatchEvent(destinationNode, EVENT_TYPES.DROP, dropEvent)

    var dragEndEvent = createCustomEvent(EVENT_TYPES.DRAG_END, event.dataTransfer)
    dispatchEvent(sourceNode, EVENT_TYPES.DRAG_END, dragEndEvent)
}