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ondragleave: Update and convert static code example to live example #12001

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ondragleave: Update and convert static code example to live example #12001

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148 changes: 87 additions & 61 deletions files/en-us/web/api/globaleventhandlers/ondragleave/index.md
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@ A {{domxref("GlobalEventHandlers","global event handler")}} for the
## Syntax

```js
var dragleaveHandler = targetElement.ondragleave;
targetElement.ondragleave = dragleaveHandler;
```

### Return value
Expand All @@ -27,90 +27,116 @@ var dragleaveHandler = targetElement.ondragleave;
## Example

This example demonstrates using the
{{domxref("GlobalEventHandlers.ondragleave","ondragleave")}} attribute handler to set an
{{domxref("GlobalEventHandlers.ondragleave","ondragleave")}} global event handler to set an
element's {{event("dragleave")}} event handler.

```js
<!DOCTYPE html>
<html lang=en>
<title>Examples of using the Drag and Drop Global Event Attribute</title>
<meta content="width=device-width">
<style>
div {
margin: 0em;
### HTML

```html
<div>
<p id="source" draggable="true">
Select this element, drag it to the Drop Zone and then release the selection to move the element.
</p>
</div>
<div id="target">Drop Zone</div>

<textarea readonly id="event-log"></textarea>
<button id="reload">Reload</button>
```

### CSS

```css
div, #event-log {
margin: 1em;
}

#source, #target {
padding: 2em;
}
#source {
color: blue;
border: 1px solid black;
}
#target {
border: 1px solid black;
}
</style>
</head>
<script>
}

#source {
color: blue;
}

#event-log {
width: 25rem;
height: 4rem;
margin-bottom: 0;
padding: .2rem;
}
```

### JavaScript

```js
const source = document.getElementById("source");
const target = document.getElementById("target");
const event_log = document.getElementById("event-log");

function dragstart_handler(ev) {
console.log("dragStart");
// Change the source element's border to signify drag has started
ev.currentTarget.style.border = "dashed";
ev.dataTransfer.setData("text", ev.target.id);
event_log.textContent += "dragStart\n";
// Change the source element's background color to signify drag has started
ev.currentTarget.style.border = "dashed";
ev.dataTransfer.setData("text", ev.target.id);
}

function dragover_handler(ev) {
console.log("dragOver");
// Change the target element's background color to signify a drag over event
// has occurred
ev.currentTarget.style.background = "lightblue";
ev.preventDefault();
event_log.textContent += "dragOver\n";
// Change the target element's border to signify a drag over event
// has occurred
ev.currentTarget.style.background = "lightblue";
ev.preventDefault();
}

function drop_handler(ev) {
console.log("Drop");
ev.preventDefault();
var data = ev.dataTransfer.getData("text");
ev.target.appendChild(document.getElementById(data));
event_log.textContent += "Drop\n";
ev.preventDefault();
const data = ev.dataTransfer.getData("text");
ev.target.appendChild(document.getElementById(data));
}

function dragenter_handler(ev) {
console.log("dragEnter");
// Change the source element's background color for enter events
ev.currentTarget.style.background = "yellow";
event_log.textContent += "dragEnter\n";
// Change the source element's background color for enter events
ev.currentTarget.style.background = "yellow";
}

function dragleave_handler(ev) {
console.log("dragLeave");
// Change the source element's background color back to white
ev.currentTarget.style.background = "white";
event_log.textContent += "dragLeave\n";
// Change the source element's border back to white
ev.currentTarget.style.background = "white";
}

function dragend_handler(ev) {
console.log("dragEnd");
// Change the target element's background color to visually indicate
// the drag ended.
var el=document.getElementById("target");
el.style.background = "pink";
event_log.textContent += "dragEnd\n";
// Change the target element's background color to visually indicate
// the drag ended.
target.style.background = "pink";
}

function init() {
// Set handlers for the source's enter/leave/end/exit events
var el=document.getElementById("source");
el.ondragenter = dragenter_handler;
el.ondragleave = dragleave_handler;
el.ondragend = dragend_handler;
}
</script>
<body onload="init();">
<h1>Examples of <code>ondragenter</code>, <code>ondragleave</code>, <code>ondragend</code></h1>
<div>
<p id="source" ondragstart="dragstart_handler(event);" draggable="true">
Select this element, drag it to the Drop Zone and then release the selection to move the element.</p>
</div>
<div id="target" ondrop="drop_handler(event);" ondragover="dragover_handler(event);">Drop Zone</div>
</body>
</html>
// Set handlers for the source's drag - start/enter/leave/end events
source.ondragstart = dragstart_handler;
source.ondragenter = dragenter_handler;
source.ondragleave = dragleave_handler;
source.ondragend = dragend_handler;

// Set handlers for the target's drop and dragover events
target.ondrop = drop_handler;
target.ondragover = dragover_handler;

// Set click event listener on button to reload the example
const button = document.getElementById("reload");
button.addEventListener("click", () => {
document.location.reload();
});
```

### Result

{{ EmbedLiveSample('Example', '100', '450') }}

## Specifications

{{Specifications}}
Expand Down