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Ilya Kantor 2017-03-21 14:41:49 +03:00
parent 4ae129054e
commit ab9ab64bd5
476 changed files with 3370 additions and 532 deletions
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2-ui/2-events/01-introduction-browser-events/04-move-ball-field/solution.view/index.html Normal file
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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<style>
#field {
width: 200px;
height: 150px;
border: 10px solid black;
background-color: #00FF00;
position: relative;
overflow: hidden;
cursor: pointer;
}
#ball {
position: absolute;
left: 0;
top: 0;
width: 40px;
height: 40px;
transition: all 1s;
}
</style>
</head>
<body style="height:2000px">
Click on a field to move the ball there.
<br>
<div id="field">
<img src="https://en.js.cx/clipart/ball.svg" id="ball"> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
</div>
<script>
field.onclick = function(event) {
// window-relative field coordinates
let fieldCoords = this.getBoundingClientRect();
// the ball has position:absolute, the field: position:relative
// so ball coordinates are relative to the field inner left-upper corner
let ballCoords = {
top: event.clientY - fieldInnerCoords.top - field.clientTop - ball.clientHeight / 2,
left: event.clientX - fieldInnerCoords.left - field.clientLeft - ball.clientWidth / 2
};
// prevent crossing the top field boundary
if (ballCoords.top < 0) ballCoords.top = 0;
// prevent crossing the left field boundary
if (ballCoords.left < 0) ballCoords.left = 0;
// // prevent crossing the right field boundary
if (ballCoords.left + ball.clientWidth > field.clientWidth) {
ballCoords.left = field.clientWidth - ball.clientWidth;
}
// prevent crossing the bottom field boundary
if (ballCoords.top + ball.clientHeight > field.clientHeight) {
ballCoords.top = field.clientHeight - ball.clientHeight;
}
ball.style.left = ballCoords.left + 'px';
ball.style.top = ballCoords.top + 'px';
}
</script>
</body>
</html>