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How does HTML5 implement drag-and-drop of elements?

Source: Internet
Author: User
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How does HTML5 implement drag-and-drop of elements?

I am afraid many front-end users do not know how to implement HTML5 drag-and-drop operations. This article describes how to implement HTML5 drag-and-drop operations. Sort the backups for future reference.

Example 1:

Index.html

Copy XML/HTML Code to clipboard
  1. <! Doctype html>
  2. <Html>
  3. <Head>
  4. <Meta charset = "UTF-8">
  5. <Title> Drag </title>
  6. <Style>
  7. . Box {
  8. Width: 400px;
  9. Height: 400px;
  10. Float: left;
  11. }
  12. # Box1 {
  13. Background: # CCC;
  14. }
  15. # Box2 {
  16. Background: # FF0;
  17. }
  18. </Style>
  19. </Head>
  20. <Body>
  21. <Div id = "box1" class = "box"> </div>
  22. <Div id = "box2" class = "box"> </div>
Copy the content to the clipboard using JavaScript Code
  1. <Script src = "app1.js"> </script>
  2. </Body>
  3. </Html>
  5. App1.js
  6. /**
  7. * App1.js
  8. */
  10. Var oBox1,
  11. OBox2,
  12. OImg1;
  14. Window. onload = function (){
  15. OBox1 = document. getElementById ('box1 ');
  16. OBox2 = document. getElementById ('box2 ');
  17. OImg1 = document. getElementById ('img1 ');
  19. //
  20. OBox1.ondragover = oBox2.ondragover = function (e ){
  21. E. preventDefault ();
  22. };
  24. //
  25. OImg1.ondragstart = function (e ){
  26. E. dataTransfer. setData ('text', e.tar get. id );
  27. };
  29. OBox1.ondrop = dropImg;
  30. OBox2.ondrop = dropImg;
  31. };
  33. Function dropImg (e ){
  34. E. preventDefault ();
  35. Var tempImg = document. getElementById (e. dataTransfer. getData ('text '));
  36. E.tar get. appendChild (tempImg );
  37. }

Knowledge points involved

The following events are triggered during drag-and-drop:
Trigger an event (Source Element) on the drag target)
Ondragstart-triggered when the user starts to drag an element
Ondrag-triggered when the element is being dragged
Ondragend-triggered after the user completes element dragging

Events triggered when the target is released
Ondragenter-this event is triggered when an object dragged by the mouse enters its container range.
Ondragover-this event is triggered when a dragged object is dragged within the range of another object container
Ondragleave-this event is triggered when an object dragged by the mouse leaves its container range.
Ondrop-this event is triggered when the mouse key is released during a drag process.

Event object (replaced by "e)

E.tar get

The description on W3Cschool is: the elements that trigger this event (the target node of the event) are returned. This target attribute is only compatible with ie9 and later versions.

E. preventDefault ()

Cancels the default action of an event.

E. dataTransfer. setData ()

Set the data type and value of the dragged data:
The Code is as follows: e. dataTransfer. setData ("Text", ev.tar get. id); // The first parameter is Text (lowercase)

E. dataTransfer. getData ()

Get dragged data:
The Code is as follows: e. dataTransfer. getData ("Text ");

The above is all the content of this article, hoping to help you learn.

Original article: http://www.cnblogs.com/oovwall/p/5213580.html

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
html5 drag and drop api html5 canvas drag and drop drag and drop website builder html5 html5 drag and drop file upload example benefits of using html5 semantic elements list of elements and symbols features of html5 and css3
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