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add draggable

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This commit is contained in:
nglk 2020-09-08 16:33:34 +02:00
parent b3a2a725b8
commit 88a7b13f9d
4 changed files with 60 additions and 0 deletions
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1
.gitignore vendored Normal file
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images/

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__pycache__/hello.cpython-36.pyc
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static/js/draggable.js Executable file
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//Make the DIV element draggagle:
dragElement(document.getElementById("draggable"));
function dragElement(elmnt) {
var pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0;
if (document.getElementById(elmnt.id + "header")) {
/* if present, the header is where you move the DIV from:*/
document.getElementById(elmnt.id + "header").onmousedown = dragMouseDown;
} else {
/* otherwise, move the DIV from anywhere inside the DIV:*/
elmnt.onmousedown = dragMouseDown;
}
function dragMouseDown(e) {
e = e || window.event;
e.preventDefault();
// get the mouse cursor position at startup:
pos3 = e.clientX;
pos4 = e.clientY;
document.onmouseup = closeDragElement;
// call a function whenever the cursor moves:
document.onmousemove = elementDrag;
}
function elementDrag(e) {
e = e || window.event;
e.preventDefault();
// calculate the new cursor position:
pos1 = pos3 - e.clientX;
pos2 = pos4 - e.clientY;
pos3 = e.clientX;
pos4 = e.clientY;
// set the element's new position:
elmnt.style.top = (elmnt.offsetTop - pos2) + "px";
elmnt.style.left = (elmnt.offsetLeft - pos1) + "px";
}
function closeDragElement() {
/* stop moving when mouse button is released:*/
document.onmouseup = null;
document.onmousemove = null;
}
}

16
templates/hello.html
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<!doctype html>
<html>
<style>
#draggable {
position: absolute;
}
</style>
<head>
<title>Hello from Flask</title>
{% if name %}
<h1>Hello {{ name }}!</h1>
{% else %}
<h1>VVVW</h1>
{% endif %}
</head>
<body>
<div id="draggable">
<img src="../static/images/test1.jpeg" width='500px' alt="test">
</div>
<script src="../static/js/draggable.js"></script>
</body>
</html>