I am implementing small software with JSF. I would like to show users' photos from Picasa, but I have no idea what is the best way to do it? There can be many users and everyone of them has their own Picasa albums.
What do you recommend and why? Is it the wisest to use already implemented JavaScript-softwares like JQuery plugins or Googles Picasa Web Albums Data API to fetch photos etc?
Thanks!
Sami
EDIT:
Have you or somebody else tried Fancybox, I have problems with js and css-files and I think that because of paths to those files. What is the correct way to refer to JS and CSS-files in JSF-files.
I recommend using a jQuery based solution like Picasa Webalbum Integrator. All you have to do is to add the required script files to your page and call the needed function, passing it the username of the gallery, like this:
<script type="text/javascript">
$(document).ready(function() { //-- default jQuery call, do stuff when page is loaded
$("#container").pwi({ //--specify your DIV's ID here
username: '#{user.userName}'
});
});
</script>
Where #{user.userName} is an EL expression pointing to the name of the user which gallery you want to show.
My mistake!
Two things what you have to remember when using jquery plugins with JSF.
<h:outputStylesheet library="css" name="pwi.css" />
<h:outputScript library="js" name="jquery.pwi.js" />
You have to use those tags. I used only h:outputScript for both of them and it seems to be ok, but of course not, generated html wasn't ok.
Other thing was that:
<h:outputScript library="primefaces" name="jquery/jquery.js" target="head" />
I am using jquery with is in Primefaces, without it there is a conflict between jquery versions or pwi doesn't find jquery at all. At least I think so :) No everything is working fine, so I am happy!
Sami
Related
I use JSF 2.3 for developing web application.
As a web developer, I care about the performance of loading speed of a site.
As I was exploring on how I could make my site faster, I encountered this post on Stack Overflow. And the quote from the accepted and most up-voted answer said
stylesheets should always be specified in the head of a document for better performance, it's important, where possible, that any external JS files that must be included in the head (such as those that write to the document) follow the stylesheets, to prevent delays in download time.
I know that JavaScript performs better when it is placed at the bottom of the <body>, but I want to include reCAPTCHA and Google instructs us to place the required external JavaScript before the closing </head> tag.
So, I decided to include the required external JavaScript before the closing </head> tag and after CSS files to boost the performance.
However, my CSS files are declared in a JSF way like <h:outputStylesheet name="css/default.css"/>, and I realized that the CSS files declared this way are always placed after files that are declared in a non-JSF way, which is <script src="https://www.google.com/recaptcha/api.js"></script>. I also considered making the external JavaScript behave in a JSF way by changing <script> to <h:outputScript>, but the <h:outputScript> can only render local scripts as described in this post .
So, the result will always be as follows.
<head>
<script src="https://www.google.com/recaptcha/api.js"></script>
<link type="text/css" rel="stylesheet" href="/project/javax.faces.resource/css/default.css.xhtml" />
</head>
insted of
<head>
<link type="text/css" rel="stylesheet" href="/project/javax.faces.resource/css/default.css.xhtml" />
<script src="https://www.google.com/recaptcha/api.js"></script>
</head>
Maybe I'm thinking too much, and the placement order of link and script doesn't affect the performance that much, but if the loading speed gets faster even a little, I want to follow the better way.
I often, change the images of my buttons using the image attribute, but someone told me that it is a good practice to do it using .css
I tried but i cant, what i am doing wrong? This is what i did:
1-The resources of my project are stored like this:
2-This is how i created the style.css for accessing the image
.c2 {
background: url(/resources/images/smiley.jpg);
}
3-This is how i access the css from the body of my page(Im sure this is correct because other classes in the same document works in other tags in this page)
<h:outputStylesheet library="css" name="style.css" />
4-This is how create a sample commandButton that uses the appropiated css class
<h:commandButton styleClass="c2"/>
I think the problem is in the .css, i tried a few combinations but none worked:
background-image: url(/resources/images/smiley.jpg);
background: url(resources/images/smiley.jpg);
background: url(smiley.jpg);
background: url(../smiley.jpg);
Where is the mistake?
update
I managed to make it work by the following code:
.c2 {
background: url("#{resource['images:smiley.jpg']}");
}
Notice the difference when i use css(right) and when i use image attribute(left)
How could i solve this so the hold image is shown?
When importing CSS stylesheets by <h:outputStylesheet>, the stylesheet is imported and processed by the FacesServlet through /javax.faces.resource/*. Look at the generated <link> element pointing to the stylesheet in question and you'll understand.
You have to change all url() dependencies to use #{resource['library:location']} instead. JSF will then auto-substitute it with the right path. Given your folder structure, you need to replace
.c2 {
background: url("/resources/images/smiley.jpg");
}
by
.c2 {
background: url("#{resource['images/smiley.jpg']}");
}
Assuming that your webapp context name is playground and that your FacesServlet is mapped on *.xhtml, then the above should end up in the returned CSS file as follows
.c2 {
background: url("/playground/javax.faces.resource/images/smiley.jpg.xhtml");
}
Noted should be that the JSF implementation will for determine only during the first request on the CSS file if it contains EL expressions. If it doesn't then it will for efficiency not anymore attempt to EL-evaluate the CSS file content. So if you add an EL expression to a CSS file for the first time, then you'd need to restart the whole application in order to get JSF to re-check the CSS file.
In case you wanted to reference a resource from a component library such as PrimeFaces, then prefix the library name, separated with :. E.g. when you're using PrimeFaces "Start" theme which is identified by primefaces-start
.c2 {
background: url("#{resource['primefaces-start:images/ui-bg_gloss-wave_50_6eac2c_500x100.png']}");
}
This will be generated as
.c2 {
background: url("/playground/javax.faces.resource/images/ui-bg_gloss-wave_50_6eac2c_500x100.png.xhtml?ln=primefaces-start");
}
See also:
How to reference CSS / JS / image resource in Facelets template?
Changing JSF prefix to suffix mapping forces me to reapply the mapping on CSS background images
Unrelated to the concrete problem, the way how you use the library is not entirely right. It's meant to be the common identifier/subfolder of all related CSS/JS/image resources. The key idea is to be able to change the entire look'n'feel by just changing the library (which can be done by EL). You seem however to be relying on the default library. In that case, you could just omit the library from your <h:outputStylesheet> and #{resource}.
<h:outputStylesheet name="css/style.css" />
See also:
What is the JSF resource library for and how should it be used?
Since I struggled with this a little bit and while BalusC has already answered the question but might be able to comment as to why this is happening. I have 5 EAR projects consisting of a bundled WAR and EJB projects. I then have one standalone WAR project deployed on its own. The following code worked perfect with all the EAR's:
<h:head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>Super FIPS Calculator PRO</title>
<style>
.Bimage{background-image:url(#{request.contextPath}/img/phonetoolsBackground.png);}
</style>
</h:head>
<h:body styleClass="Bimage">
.
.
.
Where the "img" folder was within the WEB-INF folder but for the EAR project, it would not work and it wouldnt even load the picture in the browser by manually typing in the URL. I verified the resulting html was 100% accurate. So all the talk of "resources" got me thinking that maybe it was a ?security? issue of some sort which doesnt seem to make sense between the WAR and EAR deployments so I created a "resources" folderin the root of the web application, e.g. in Eclipse its parent would be WebContent, then added a subfolder to resources called "img", placed my image in there.
The code now looks like this:
<h:head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>Super FIPS Calculator PRO</title>
<style>
.Bimage{background-image:url(#{request.contextPath}/resources/img/phonetoolsBackground.png);}
</style>
</h:head>
<h:body styleClass="Bimage">
.
.
.
And now the image is displayed. Again not trying to hijack balusc's thorough answer, I just wanted to bring it up in case anyone ran into a similar issue. If someone wants me to open a separate Q and A I will!
Ahh yes, this was on JBoss EAP 7, Servlet API 3.1, Facelets 2.2, Rich Faces 4.5.17 Java 1.8.
Edit #Basil-Bourque answer What is WEB-INF used for in a Java EE web application seems fairly relevant
But its still a little confusing in that how can a WAR within an EAR access that location but not a standalone WAR?
By using the following code in header, I have managed for the rss button in url bar in browser to successful find my feed.
<link rel="alternate" type="application/rss+xml" title="Blog Title" href="http://www.weeblysite.com/1/feed" />
However, the subtome button on browser fails to locate feed. Therefore Feedly, Digg Reader, etc, finds no feed.
How can I implement code in my Weebly generated site to allow all such browser buttons to pick up and subscribe to feed?
Thank you.
Nicholas Boyd Crutchley
http://www.nicholasboydcrutchley.com/infin-story
this is a new blog.. no post...but the old blog has same problem..
The problem comes from the fact that your page has a broken discovery mechanism.
Right now in the <head> section of your HTML page, I can see this:
<link rel='alternate' type='application/rss+xml' title='RSS 2.0' href='http:////feed' />
And clearly, http:////feed is not the right feed url :) You want to have this:
<link rel='alternate' type='application/rss+xml' title='RSS 2.0' href='http://www.nicholasboydcrutchley.com/1/feed' />
And everything should be smooth!
The JS file extra.js is included as follows:
<h:outputScript library="js" name="extra.js" />
I am facing issue of browser caching. Many times, I will not get the updated copy.
In plain HTML, we used to append version number or random number with JS URL like:
<script type="text/javascript" src="http://yyy.zzzz.net/js/tryjs?v=1234"></script>
where v is the version number.
Is there any way to add some version number to the generated resource URL in h:outputScript?
You can do one of the following
Manage the version number in one of you beans #{myBean.myVersion} and append it to you js file in h:outputScript
Like this:
<h:outputScript library="js" name="extra.js?#{myBean.myVersion}/>
or rename your js file to include the #{myBean.myVersion} as a part of its name like this
<h:outputScript library="js" name="extra.#{myBean.myVersion}.js/>
Also you can take a look at this : Resources (Library) In JSF 2.0
i have an external CSS file in the resources folder under WebContent folder, and i included it at the page header as follows:
<h:head>
<h:outputStylesheet name="css/style.css" library="css" />
</h:head>
i tried a simple selector to test the if the file is working like body {background-color:#b0c4de;} but unfortunately the file isn't linked
for more clarity i included here a screenshot for the exact location of the resources folder
First of all, this is not an external CSS file at all. It's internal to your web application. A real external CSS file would be served from a different domain and is not importable via <h:outputStylesheet>, but only via <link>.
Your concrete problem is caused because you unnecessarily repeated the CSS file folder into the library attribute. Just get rid of it.
<h:outputStylesheet name="css/style.css" />
The library attribute must represent the common module/theme/library name, such as "primefaces", but you don't have any here. Using a library name of "css" makes no utter sense as "css" just represents the file/content type.
See also:
How to reference CSS / JS / image resource in Facelets template?
What is the JSF resource library for and how should it be used?
Try
h:outputStylesheet name="style.css" library="css" />
here is a ref:
http://www.mkyong.com/jsf2/how-to-include-cascading-style-sheets-css-in-jsf/