Disable Drag and Drop on HTML elements?

问题

I\'m working on a web application for which I\'m attempting to implement a full featured windowing system. Right now it\'s going very well, I\'m only running into one minor issue. Sometimes when I go to drag a part of my application (most often the corner div of my window, which is supposed to trigger a resize operation) the web browser gets clever and thinks I mean to drag and drop something. End result, my action gets put on hold while the browser does its drag and drop thing.

Is there an easy way to disable the browser\'s drag and drop? I\'d ideally like to be able to turn it off while the user is clicking on certain elements, but re-enable it so that users can still use their browser\'s normal functionality on the contents of my windows. I\'m using jQuery, and although I wasn\'t able to find it browsing the docs, if you know a pure jQuery solution it would be excellent.

In short: I need to disable browser text selection and drag-and-drop functions while my user has the mouse button down, and restore that functionality when the user releases the mouse.

回答1:

Try preventing default on mousedown event:

<div onmousedown="event.preventDefault ? event.preventDefault() : event.returnValue = false">asd</div>

<div onmousedown="return false">asd</div>

回答2:

This thing works.....Try it.

<BODY ondragstart="return false;" ondrop="return false;">

hope it helps. Thanks

回答3:

You can disable dragging simply by using draggable="false" attribute.
http://www.w3schools.com/tags/att_global_draggable.asp

回答4:

This might work: You can disable selecting with css3 for text, image and basically everything.

.unselectable {
   -moz-user-select: -moz-none;
   -khtml-user-select: none;
   -webkit-user-select: none;

   /*
     Introduced in IE 10.
     See http://ie.microsoft.com/testdrive/HTML5/msUserSelect/
   */
   -ms-user-select: none;
   user-select: none;
}

Of course only for the newer browsers. For more details check:

How to disable text selection highlighting using CSS?

回答5:

With jQuery it will be something like that:

$(document).ready(function() {
  $('#yourDiv').on('mousedown', function(e) {
      e.preventDefault();
  });
});

In my case I wanted to disable the user from drop text in the inputs so I used "drop" instead "mousedown".

$(document).ready(function() {
  $('input').on('drop', function(event) {
    event.preventDefault();
  });
});

Instead event.preventDefault() you can return false. Here's the difference.

And the code:

$(document).ready(function() {
  $('input').on('drop', function() {
    return false;
  });
});

回答6:

try this

$('#id').on('mousedown', function(event){
    event.preventDefault();
}

回答7:

For input elements, this answer works for me.

I implemented it on a custom input component in Angular 4, but I think it could be implemented with pure JS.

HTML

<input type="text" [(ngModel)]="value" (ondragenter)="disableEvent($event)" 
(dragover)="disableEvent($event)" (ondrop)="disableEvent($event)"/>

Component definition (JS):

export class CustomInputComponent { 

  //component construction and attribute definitions

  disableEvent(event) {
    event.preventDefault();
    return false;
  }
}

回答8:

using @SyntaxError's answer, https://stackoverflow.com/a/13745199/5134043

I've managed to do this in React; the only way I could figure out was to attach the ondragstart and ondrop methods to a ref, like so:

  const panelManagerBody = React.createRef<HTMLDivElement>();
  useEffect(() => {
    if (panelManagerBody.current) {
      panelManagerBody.current.ondragstart = () => false;
      panelManagerBody.current.ondrop = () => false;
    }
  }, [panelManagerBody]);

  return (
    <div ref={panelManagerBody}>

回答9:

I will just leave it here. Helped me after I tried everything.

   $(document.body).bind("dragover", function(e) {
        e.preventDefault();
        return false;
   });

   $(document.body).bind("drop", function(e){
        e.preventDefault();
        return false;
   });

回答10:

This is a fiddle I always use with my Web applications:

$('body').on('dragstart drop', function(e){
    e.preventDefault();
    return false;
});

It will prevent anything on your app being dragged and dropped. Depending on tour needs, you can replace body selector with any container that childrens should not be dragged.

回答11:

This JQuery Worked for me :-

$(document).ready(function() {
  $('#con_image').on('mousedown', function(e) {
      e.preventDefault();
  });
});

来源：https://stackoverflow.com/questions/704564/disable-drag-and-drop-on-html-elements

标签

javascript

jquery

css

webbrowser-control