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采用imagecropper.jss+canvas实现裁剪后多尺寸的图像预览

2017-01-07 11:22 253 查看

采用imagecropper.jss+canvas实现裁剪后多尺寸的图像预览

<!doctype html>
<html>

<head>
<meta name="Author" content="flashlizi - www.riaidea.com">
<meta name="Description" content="HTML5 experiment">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>头像上传组件 - HTML5版</title>

<style>
body
{
padding: 0;
margin: 0;
height: 100%;
background-color: #eee;
font-size: 12px;
color: #666;
}

a
{
text-decoration: none;
color: #333;
}

a:hover
{
text-decoration: none;
color: #f00;
}

#container
{
position: absolute;
left: 20px;
top: 20px;
}

#wrapper
{
position: absolute;
left: 0px;
top: 40px;
}

#cropper
{
position: absolute;
left: 0px;
top: 0px;
border: 1px solid #ccc;
}

#previewContainer
{
position: absolute;
left: 350px;
top: 60px;
}

.preview
{
border: 1px solid #ccc;
}

#selectBtn
{
position: absolute;
left: 0px;
top: 0px;
width: 119px;
height: 27px;

}

#saveBtn
{
position: absolute;
left: 150px;
top: 0px;
width: 67px;
height: 27px;

}

#rotateLeftBtn
{
position: absolute;
left: 0px;
top: 315px;
width: 100px;
height: 22px;
padding-left: 25px;
padding-top: 2px;

}

#rotateRightBtn
{
position: absolute;
left: 225px;
top: 315px;
width: 50px;
height: 22px;
padding-right: 25px;
padding-top: 2px;

}

</style>


<script type="text/javascript" src="imagecropper.js"></script>
<script type="text/javascript">

var cropper;

function init()
{
cropper = new ImageCropper(300, 300, 180, 180);
cropper.setCanvas("cropper");
cropper.addPreview("preview180");
cropper.addPreview("preview100");
cropper.addPreview("preview50");

if(!cropper.isAvaiable())
{
alert("Sorry, your browser doesn't support FileReader, please use Firefox3.6+ or Chrome10+ to run it.");
}
}

function selectImage(fileList)
{
cropper.loadImage(fileList[0]);
}

function rotateImage(e)
{
switch(e.target.id)
{
case "rotateLeftBtn":
cropper.rotate(-90);
break;
case "rotateRightBtn":
cropper.rotate(90);
break;
}
}

function saveImage()
{
var imgData = cropper.getCroppedImageData(140, 140);
console.log(imgData);

var p_url='<?php echo $this->U("userAvatar/ajaxCheckUploadImg");?>';
var p_data={ImgData:imgData};

$.post(p_url,p_data,function(data){
console.log(data);
data = eval('(' + data + ')');
if( data.success )
{
window.location.reload();
}else{
var d = dialog({
fontsize:10,
content: '上传失败！请重新上传',
quickClose: true
}).showModal();
setTimeout(function () {
d.close().remove();
}, 2000);
}
})

}

function trace()
{
if(typeof(console) != "undefined") console.log(Array.prototype.slice.apply(arguments).join(" "));
};

</script>

</head>

<body onload="init();">
<div id="container">
<a id="selectBtn" href="javascript:void(0);" onclick="document.getElementById('input').click();">选择</a>
<a id="saveBtn" href="javascript:void(0);" onclick="saveImage();">保存</a>
<input type="file" id="input" size="10" style="visibility:hidden;" onchange="selectImage(this.files)" />

<div id="wrapper">
<canvas id="cropper"></canvas>
<a id="rotateLeftBtn" href="javascript:void(0);" onclick="rotateImage(event);">向左旋转</a>
<a id="rotateRightBtn" href="javascript:void(0);" onclick="rotateImage(event);">向右旋转</a>

<span id="status" style="position:absolute;left:350px;top:10px;width:100px;"></span>
<div id="previewContainer">
<canvas id="preview180" width="180" height="180" class="preview"></canvas>
<span style="display:block;width:100%;padding-top:5px;text-align:center;">大尺寸图片，180x180像素</span>

<canvas id="preview100" width="100" height="100" style="position:absolute;left:230px;top:0px;" class="preview"></canvas>
<span style="position:absolute;left:230px;top:110px;width:100px;text-align:center;">中尺寸图片 100x100像素</span>

<canvas id="preview50" width="50" height="50" style="position:absolute;left:255px;top:150px;" class="preview"></canvas>
<span style="position:absolute;left:245px;top:210px;width:70px;text-align:center;">小尺寸图片 50x50像素</span>
</div>
</div>

</div>
</body>
</html>

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