Downloading image/text file using 'iframe' - extjs

Question

I am using Extjs - 4.1.0 and I want to prompt download window. I used 'iframe'. The window displays only when the file being posted is zip/mp3 but when the file being posted is text/image file, the window doesn't appear. Is there some property to be set to enable download window for text/image/different files?
Please find my code below.
var record = item.findParentByType('itemcontextmenu').record;
Ext.Ajax.request({
url : ORT.Configuration.DOWNLOAD_GRAPHICS_URI+"&graphics="+record.get('id'),
success: function (response, opt) {
result = Ext.decode(response.responseText);
try {Ext.destroy(Ext.get('graphicsDownloadIframe'));}catch(e) {}
Ext.core.DomHelper.append(document.body, {
tag: 'iframe',
id:'graphicsDownloadIframe',
css: 'display:none;visibility:hidden;height:0px;',
src: result.fileName,
frameBorder: 0,
width: 0,
height: 0
});
}
});

Answer 1

It's all about the mimetype and what your browser does with it. So I guess your problem will the that. Which likely will cause the browser to handle the received file different.
Edit
Following is a helper class that I still use
Ext.ux.util.HiddenForm = function(url,fields){
if (!Ext.isArray(fields))
return;
var body = Ext.getBody(),
frame = body.createChild({
tag:'iframe',
cls:'x-hidden',
id:'hiddenform-iframe',
name:'iframe'
}),
form = body.createChild({
tag:'form',
cls:'x-hidden',
id:'hiddenform-form',
action: url,
target:'iframe'
});
Ext.each(fields, function(el,i){
if (!Ext.isArray(el))
return false;
form.createChild({
tag:'input',
type:'text',
cls:'x-hidden',
id: 'hiddenform-' + el[0],
name: el[0],
value: el[1]
});
});
form.dom.submit();
return frame;
}
Usage
Ext.ux.util.HiddenForm('http://localhost/file/fetch',[['PropName','PropValue'],['Prop2Name','Prop2Value']])
The server take these arguments and build up a sort of 'FileStreamResult' which trigger a download on the clientside. If you are using a language like .Net or Java then there are already implementations you can use, if you are using PHP you might find this helpful. Anyway, look at your backend...