Pass object through dataTransfer

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你的背包
你的背包 2021-01-31 08:16

I\'m trying to figure out a way to pass a native object through javascript\'s event.dataTransfer for drag and drop. I\'m writing the front end editor portion of a CMS, and want

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  • 2021-01-31 08:17

    You should pass the object to JSON.stringify before using setData because you can only store strings.

    var j = JSON.stringify(foo);
    e.originalEvent.dataTransfer.setData("foo", j);
    

    And the other way round you have to reconvert the string to an object:

    var obj = JSON.parse(e.originalEvent.dataTransfer.getData("foo"));
    console.log("foo is:", obj);
    

    See this working Fiddle

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  • 2021-01-31 08:34

    Maybe what I am about to suggest is wrong (if so I will be happy to hear why ). Why not set a variable in the dragstart listener to reference what you need, for example:

    //global variable
    var obj;
    
    //set the global variable to wahtever you wish in the dragstart:
    $dragme.on("dragstart", function(e) {
        obj = foo;
        //or even obj = document.getElementById("some element's id");
    });
    
    //use this obj in the drop listener.
    $dropzone.on("drop", function(e) {
        obj.doWahtEver();
    });
    
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