我试图制作一个下载图像的按钮,我做的是,做了这样的功能:
function download_image(){
$file = $_POST['file'];
header('Content-Description: File Transfer');
header("Content-type: application/octet-stream");//notice this content-type, it will force a download since browsers think that's what they should do with .exe files
header("Content-disposition: attachment; filename= ".$file."");
readfile($file);
}
当点击下载按钮时,我执行了这个js:
$.ajax({
type:"POST",
url:'..address to../download_image',
data:{
file:imgElem
},
success:function(){
alert('image downloaded');
}
});
现在问题是我没有图像名称,但编码图像是这样的:
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAABBgAAAEtCAYAAACibtPQAAAgAElEQVR4nO3dX28c150mYH+c+S57s5d7uVcFGMEGuQiwgW+ycCEAsdl4gQjGJqsyYIyCYEbwEDXKZD1KNLHVtjMZDeM/kmmWLJmOrSiOzViOJDJiHNtnLoLqLRarm8VDFfsU63mBBzabzWZ12/rp1MtTzSdCCKEoipBlWciyLFRVFbpSVdX8PlmWhTzPO+8nIiIiIiIiItPLE7PZLJRlGUIIoSzLUBRF5x3rgkFEREREREREpJ0nmh8oGEREREREREQkJvOCIc/z+U6GrrQvkVh2XxERERERERGZVo61g6H+nN0MIiIiIiIiItLME+0b+hYHy94QUkRERERERESmlSfKsgyz2SyEEMJsNjvw2yHyPO/c0WAHg4iIiIiIiIg080QIi39NZbNgaL8HQ11KiIiIiIiIiIgcukRCREREREREROS4UTCIiIiI...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">
所以问题是我应该如何下载图像?请帮忙:(
答案 0 :(得分:2)
只需将window.location
设置为已编码的 URI ,例如
window.location.href = 'data:image/png;base64,iVBORw0KGgo...
或者你也可以打开一个弹出窗口
http://jsfiddle.net/vaibviad/VE8Qn
如果您想拥有文件名和扩展名,那么您也可以尝试使用
<a download="FILENAME.EXT" href="data:image/png;base64,asdasd...">Download</a>
以下链接是带有filename和ext
的下载属性的demohttp://jsfiddle.net/vaibviad/VE8Qn/3/
注意:Download attribute不受广泛支持
答案 1 :(得分:1)
JavaScript无法保存文件,因此在这种情况下,您需要从url
返回API
,然后在success
函数中返回window.location = ....returned value...
这个将下载该文件。
如果需要DEMO,请告诉我。