目标:我想通过颜色选择器HTML元素选择一种颜色,在此更改之后,我想立即看到具有相同颜色的canvas元素。
问题:我可以通过颜色选择器选择颜色,但是我的画布矩形没有更改颜色。所有问题都集中在更强大的解决方案上(例如,使用JBOSS或jQuery或SpringBoot)
像这里:
我尝试过的事情:
function setColorAccordingToColorPicker() {
var rectangle = getElementById("canvasColorpicker");
var colorinput = document.getElementById("colorPicker");
var color = colorinput.value;
rectangle.fillStyle = color;
rectangle.fillRect(20, 20, 60, 60);
}
他们都没有帮助。
MCVE:
HTML
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/html">
<head>
<title>Example</title>
<link href="style.css" rel="stylesheet" type="text/css">
</head>
<body>
<canvas id="canvasColorpicker" class="white"></canvas>
<input type="color" value="#001A57" onchange="setColorAccordingToColorPicker()" id="colorPicker">
<script src="javascript.js"></script>
</body>
</html>
Javascript
function setColorAccordingToColorPicker() {
var rectangle = getElementById("canvasColorpicker");
var colorinput = document.getElementById("colorPicker");
var color = colorinput.value;
rectangle.style.backgroundColor = color;
}
CSS
.white {
background-color: #001A57;
}
canvas {
width: 200px;
height: 100px;
margin: 10px;
border: 1px solid lighgrey;
}
有人可以帮忙看看有什么问题吗?谢谢!
function setColorAccordingToColorPicker() {
var rectangle = document.getElementById("canvasColorpicker");
var colorinput = document.getElementById("colorPicker");
var color = colorinput.value;
rectangle.style.backgroundColor = color;
}
.white {
background-color: #001A57;
}
canvas {
width: 200px;
height: 100px;
margin: 10px;
border: 1px solid lighgrey;
}
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/html">
<head>
<title>Example</title>
<link href="style.css" rel="stylesheet" type="text/css">
</head>
<body>
<canvas id="canvasColorpicker" class="white"></canvas>
<input type="color" value="#001A57" onchange="setColorAccordingToColorPicker()" id="colorPicker">
<script src="javascript.js"></script>
</body>
</html>
需要一些小的更改:
更改此:var rectangle = getElementById("canvasColorpicker");
收件人:var rectangle = document.getElementById("canvasColorpicker");