如何使用Javascript上传网页中的图片?
How to upload image in web page using Javascript?
我要上传网页中的图片。代码没有错误,但我仍然无法在网页中上传图片并在 canvas 中显示。该图像已上传到网页中,但未显示在我创建的 canvas 中。请帮我找出我的代码有什么问题?
这是孔 html 页面的代码。
function upload(){
var dd=document.getElementById('can');
var filein=document.getElementById('finp');
var img = new SimpleImage(filein);
img.drawTo(dd);
}
function docolor(){
var dd1=document.getElementById("can2");
var colin=document.getElementById("clr");
var col=colin.value;
dd1.style.backgroundColor=col;
}
<html>
<head>
<script src="http://www.dukelearntoprogram.com/course1/common/js/image/SimpleImage.js"></script>
</head>
<body>
<h3>HTML code for canvas and upload button</h3>
<canvas id="can">
</canvas>
<h3>Load Image</h3>
<input type="file" multiple="false" accept="image/*" id="finp" onclick="upload()" >
</body>
</html>
我认为您在 HTML 元素和 JS 代码中使用的 ID 不匹配。
function upload(){
var dd=document.getElementById('can');
var filein=document.getElementById('finp');
var img = new SimpleImage(filein);
img.drawTo(dd);
}
function docolor(){
var dd1=document.getElementById("can2");
var colin=document.getElementById("clr");
var col=colin.value;
dd1.style.backgroundColor=col;
}
<script src="http://www.dukelearntoprogram.com/course1/common/js/image/SimpleImage.js" ></script>
<canvas id='can' class='canvasRoundCorders'></canvas>
<input id='finp' type='file' accept='image/*' onchange="upload()">
我要上传网页中的图片。代码没有错误,但我仍然无法在网页中上传图片并在 canvas 中显示。该图像已上传到网页中,但未显示在我创建的 canvas 中。请帮我找出我的代码有什么问题? 这是孔 html 页面的代码。
function upload(){
var dd=document.getElementById('can');
var filein=document.getElementById('finp');
var img = new SimpleImage(filein);
img.drawTo(dd);
}
function docolor(){
var dd1=document.getElementById("can2");
var colin=document.getElementById("clr");
var col=colin.value;
dd1.style.backgroundColor=col;
}
<html>
<head>
<script src="http://www.dukelearntoprogram.com/course1/common/js/image/SimpleImage.js"></script>
</head>
<body>
<h3>HTML code for canvas and upload button</h3>
<canvas id="can">
</canvas>
<h3>Load Image</h3>
<input type="file" multiple="false" accept="image/*" id="finp" onclick="upload()" >
</body>
</html>
我认为您在 HTML 元素和 JS 代码中使用的 ID 不匹配。
function upload(){
var dd=document.getElementById('can');
var filein=document.getElementById('finp');
var img = new SimpleImage(filein);
img.drawTo(dd);
}
function docolor(){
var dd1=document.getElementById("can2");
var colin=document.getElementById("clr");
var col=colin.value;
dd1.style.backgroundColor=col;
}
<script src="http://www.dukelearntoprogram.com/course1/common/js/image/SimpleImage.js" ></script>
<canvas id='can' class='canvasRoundCorders'></canvas>
<input id='finp' type='file' accept='image/*' onchange="upload()">