problem:
Ajax is inable to receive a response in any form but text. Since it is now common for web applications to offer options for exporting your data in desktop app formats — such as .doc or .xls
方法一：
http://www.filamentgroup.com/lab/jquery_plugin_for_requesting_ajax_like_file_downloads/
jQuery.download = function(url, data, method){
//url and data options required
if( url && data ){
//data can be string of parameters or array/object
data = typeof data == ‘string’ ? data : jQuery.param(data);
//split params into form inputs
var inputs = ‘’;
jQuery.each(data.split(‘&’), function(){
var pair = this.split(‘=’);
inputs+=’<input type="hidden" name="’+ pair[0] +’" value="’+ pair[1] +’" />’;
});
//send request
jQuery(‘<form action="’+ url +’" method="’+ (method||’post’) +’">’+inputs+’</form>’)
.appendTo(‘body’).submit().remove();
};
};
$.download(‘/export.php’,’filename=mySpreadsheet&format=xls&content=’ + spreadsheetData );
方法二：
Ajax的处理都是异步的，所以想实现文件下载这种同步的操作，就比较捉襟见肘。
不过google了一下，找到了一个方法，当然不是完美
主旨就是提交一个request，在server端将文件生成好，然后返回文件名，
client端则在js中隐藏一个frame，将frame的src指向生成的文件（根据返回的文件名）
client:
Ext.Ajax.request({
url: ‘/csvoutput/‘,
success: function(r, o) {
obj = Ext.util.JSON.decode(r.responseText);
try {
Ext.destroy(Ext.get(‘downloadIframe’));
}
catch(e) {}
Ext.DomHelper.append(document.body, {
tag: ‘iframe’,
id:’downloadIframe’,
frameBorder: 0,
width: 0,
height: 0,
css: ‘display:none;visibility:hidden;height:0px;’,
src: obj.filename
});
},
failure: function(r, o){
},
headers: {
’my-header’: ‘csvoutput’
},
params: { }
});
server:(django)
result = {}
result[‘filename’] = filename
result[‘success’] = True
return HttpResponse(simplejson.dumps(result), mimetype=’text/javascript’)