On my page there are a log of images (appr. 100-120), and I'm using the Image cropper.
<img width="303" src="#Umbraco.TypedMedia((int)categoryImage.Id).GetCropUrl(303, 404)&quality=75" alt="" />
According to google pagespeed and gmetrix the biggest problem is: "Remove query strings from static resources".
Any suggestions?
There is a difference between Umbraco 6 and 7 in the image cropper function. In Umbraco 6 it is generated in the media folder and the url is without querystring. (a named crop)
In Umbraco 7 the generated image is cached in the \App_Data\cache so only the first hit should be slower. But the url is with a querystring.
A false positive, in terms of speed, it does not matter much.
You can probably come up with somethings like, url rewrite or something but then you lose flexibility, or another cropper, like the Umbraco 6 way, with minimum speed profit. or CSS sprites.
Related
The image is rendered on my blog of website using following erb code
<a href="<%= article_url(article)%>">
<img src="<%= article.main_image_url%>" alt="<%= article.title%>" /</a>
The main image url is actually stored in cloudfront on the url
https://s3.ap-south-1.amazonaws.com/mywebsite-dev/uploads/article/main_image/100/wonderful_image__1_.jpg
A scaled down version of size 500 X 250 pixel is stored at location
https://s3.ap-south-1.amazonaws.com/mywebsite-dev/uploads/article/main_image/100/large_wonderful_image__1_.jpg
My model of the article only saves the main image url. However, while uploading the image to s3, I do create a scaled down version of the image and add 'large_' prefix. This can be seen in the above url examples.
As of now, my erb code, renders the main image on the webpage and I need to edit this code, so that it renders the scaled down image instead. Basically, I need to edit this
<img src="<%= article.main_image_url%>"
so that erb changes
(The urls below are changed to blank client website'
https://s3.ap-south-1.amazonaws.com/mywebsite-dev/uploads/article/main_image/100/wonderful_image__1_.jpg
to this
https://s3.ap-south-1.amazonaws.com/mywebsite-dev/uploads/article/main_image/100/large_wonderful_image__1_.jpg
May be I need to split the article url by '/', take out the last part and add 'large_' to it.
Thanks in advance for the help. I am quite new to ROR and more into python.
Regards
I figured it out.It may be not a clean solution but it worked for me as of now.
<img src="<%= article.main_image_url.rpartition('/').first+'/large_'+article.main_image_url.rpartition('/').last%>" alt="<%= article.title%>" />
Thanks to everyone
I am using MVC3, Razor, C#, EF4.1, MSSQL2008
I have implemented a mechanism to upload files to a web server "Uploads" folder.
The issue I have is that when the user is returned to the "Upload" view, the image is still the old one. This may be linked to the fact that I am using the PK of the User's Organisation as the filename ie 100.png. So swapping the image will produce another 100.png, ie overwrite the original. This prevents lots of rubbish files if I used a GUID instead. However the browser thinks nothing has changed so loads it, I guess, out of cache.
My razor code is:
if (File.Exists(Server.MapPath("~/Uploads/" + strImageFileName)))
{
<p><img alt="Current Image" src="#Href("~/Uploads/" + strImageFileName)"/> </p>
}
else
{
<p><img alt="Current Image" src="#Href("~/Uploads/NoImageFile.png")"/> </p>
}
If I get this issue, then a Shift Refresh usually does the job, although I would like this to be automatic. Is there a way to force a refresh, via code, so the newest Image is always shown. We did seem to have more issues with Chrome for some reason.
Thoughts?
Thanks in advance.
Changing the url referenced by the link seems to be a lightweight solution over using AJAX.
http://www.immense.net/force-update-cached-files-images-favicon/
by adding something arbitrary like a version number. The browser will update the cashed image with the current version.
<img alt="Current Image" src="#Href("~/Uploads/" + strImageFileName + Version )"
you might want to use an action to return the image over a direct url to the image. If you are not already doing so.
I am currently creating an MVC 4 web application.
I have an action that has a base background image which is always the same then an arrow image which changes in degrees depending on the information that is collected within the action.
I call this action using
<img src="#Url.Action("trend-image", "NonReg_Reports")" alt="background" width="245" height="105" />
This works fine when it is called and is just displaying a HTML webpage. It gives me the HTML.
<img src="/nonreg-report/01495344/trend-image" alt="background" width="245" height="105">
I am then using Rotativa / Wkhtmltopdf to convert this HTML page into a PDF. This runs the same piece of code as above.
The problem is I am just getting a white box with the alternative text in it if I use the code above.
If I use <img src="~/Content/images/trend_back_medium.png" alt="astuff" /> which is the actual background image in my project it works fine.
The image from the code above can not be saved anywhere due to how it is used. I am thinking that it is a path problem, but after trying lots of different things I can still not get it to work.
Any suggestions or help would be greatly appreciated Thank you.
I had the same problem. Normal html view was ok with pictures, pdf was not display it. I used Server.MapPath to point to picture and it was ok...
<img src="#Server.MapPath("~/Folder/SubFolder/Subfolder/ImageName.png")" />
I hope this will help
Adam
I faced the same problem and I found a workaround, not a nice one, but it suits my needs.
It seems that Rotativa(Wkhtmltopdf?) have a problem with images which are returned from http handler (at least my case). So to handle this situation, in controller action before return new ViewAsPdf... my code manually save file to some local 'temp' folder and replace 'src' of images in rendered view with paths to that local files in server path manner, eg: http://localhost/img/temp/trend-image.png.
This is not a nice solution, if you already found better one, let me know.
Adding the attribute [System.Web.Mvc.AllowAnonymous] to the controller method returning the image solved the problem for me.
It seems to work okay via css...
I was trying to display a logo at the top of the page and switched it with a div and set the height and width to that of the image.
CSS:
div.logo {
background-image: url("/images/logo/logo.png");
height: 53px;
width: 185px;
}
HTML:
<div class="logo"></div>
I found that with my pages, the images were not showing because they were .gif files.
Rotativa can have problems with gifs.
When I changed the images to .jpg or .png everything worked well.
I think it might come down to basically the ".png" bit being missing.
You could add a mapping like this /nonreg-report/01495344/trend-image.png ยป /nonreg-report/01495344/trend-image and have both of the urls active, why not? That way wkhtmltopdf is fooled and you still have your dynamic image without saving it anywhere on disk. Dynamic urls can work, I do that for live-converting gif2png for wkhtmltopdf.
Also it might help to have an absolute url, which I think you can do with something like this:
src="#Url.Action("trend-image", "NonReg_Reports", null, Request.Url.Scheme)"
If you are specifiying height and width then make sure you should write it in style tag
like <some-tag style="height: 100px; width:100px">
There are lots of questions about how to force the browser to cache or not to cache any image. But, I am facing slightly different situation. In several places of my web page, I am using following code for the images.
<img title="<%= Html.Encode(Model.title)%>"
src="<%= Url.Action(MVC.FrontEnd.Actions.RetrieveImage(Model.SystemId))%>"/>
So, in the generated HTML it is like
<img title="blahblah" src="http://xyz.com/FrontEnd/Actions/RetrieveImage?imageId=X">
Where X is some integer. I have seen that though the browser (IE or Mozilla) caches images by default, it is not caching images generated by above method.
Is there any way I can tell browser to cache images of above type?
Thanks in advance.
In order to do this you can set the Expires and MaxAge headers of the response. To simplify things, you can create a custom ActionFilter.
Here's a good guide in how to achieve this: ASP.NET MVC Action Filter - Caching and Compression
Is there a way to get struts 2 (using tiles) to build the whole page before sending it to the browser? I don't want the page to be build "progressively" in the browser one part at a time.
The main problem I'm trying to solve is that internet explorer 7 flashes/blinks the page even if only some of the content changes (firefox does this much more smoothly).
So that if I have a page with:
HEADER
some content
FOOTER
And the "some content" area only changes between page loads, the FOOTER part still flashes the white background before filling it with the background color of the footer. I tought that maybe by getting struts to send the complete page it would load fast enough to eliminate the "blinking".
Now the FOOTER comes from the server a little bit later than the parts before it and so it flashes (in internet explorer, firefox displays the page smoothly).
NB: this is an important requirement for the site, and using ajax to load the middle content is out (as are frames or other "hacks"). The site is built using CSS and not a table layout, maybe I will have to use a table layout to get it to work...
About using tiles flush parameter:
I tried that and it doesn't work as I need. I would need a flush-parameter for the whole page. I have tried the normal jsp page directive "autoFlush=false" but it didn't work. I set this directive on my main template page (and not in the tiles).
Here is an example from the main template, which uses header, body and footer templates. With the Thread.sleep() I added the problem is easy to spot. The footer renders 2 secs later than the rest of the page.
<body>
<div id="container">
<t:insertAttribute name="header" flush="false" />
<div id="content"><t:insertAttribute name="body" flush="false"/></div>
<div class="clear"></div>
<% Thread.sleep(2000); %>
<t:insertAttribute name="footer" flush="false" />
</div>
</body>
UPDATE
Thanks for the comments. The requirement is actually almost reasonable as this isn't a normal web page, think embedded.
But apparently there is no way of configuring IE to start rendering after some delay (like firefox has a configurable delay of some 100ms)?
I tried to intercept the TilesResult but the method doExecute is run before the whole content is apparently evaluated, so the method has already exited before the jsp is evaluated (my Thread.sleep() test). I was wondering how I could render the whole response to a string and then output that all at once to the browser.
I know that this isn't foolproof and network delays etc may factor in this, but if I could get the response to output all at once and maybe use a table based layout (IE possibly renders the table only after the table closes) this could work reasonably.
Or then try to get this switched to firefox or maybe forget all about this little glitch...
UPDATE 2
This started to bother me so I did some investigation.
If I had a plain jsp page (no tiles) the buffering works (with the buffer attribute), so that if I had my Thread.sleep() there the whole page rendered after two seconds if the page size was below the buffer size.
But if I used tiles in the page (as in the example above) I couldn't get the page to render at the same time (I even included the page directive in all my tiles-templates/"components", no help). So tiles probably flushes the response somewhere?
Furthermore, the "problematic tiles" was my body-part, which contained a struts:form tag. I replaced it with a normal form-tag and it worked as I wanted...
UPDATE 3
Ok, nobody seems to know the inner workings of tiles or struts tags...
No big problem as this is a very specific case and requirement.
I worked around it by using apache as a proxt in front of the application, and using apache's proxy configuration options to specify a large buffer.
I'll mark this as answered.
You can send page data all at once at the server end if you like (and many frameworks do that anyway for convenience) but the reality of networking is that it won't all arrive at once and the browser will render it as packets arrive. And this is a good thing for responsiveness, even if you* aesthetically would like the page to display all at once.
You can reduce the lag as much as possible by simplifying markup and using deflate compression to keep the payload size down, and that's a worthwhile thing to do in general. Plus you can make sure you're not hitting a Flash Of Unstyled Content. But you can't control when the browser chooses to render, short of doing it all in JavaScript with all the downsides that entails (and even then, the browser might redraw slowly).
(* - or your client/boss, if that's who has come up with this "important requirement" that your site somehow work differently to every other page on the web.)
Can you use the "flush" attribute on the tiles components?
<tiles:insertAttribute name="body" flush="false"/>
In addition if the output buffer gets too big, it will flush anyway. Try increasing the buffer size?
<%# page language="java" buffer="500kb" autoFlush="false" %>