I am using sitemesh for a spring based site. The problem is that I have some javascript that I want it to run on the onload event of only one specific page using jquery $(function() { ... }) and not on every page.
I have included the jquery.js in the bottom of my decorator, after the body. So, if I try to include a <script> tag in the body of my decorated page the script won't be executed because jquery will be loaded after that! I know that I could include the jquery.js in the header of my decorator so it will be before the custom script in the decorated page however I don't really like that solution since it will contain javascritp in the head of my page.
So I would like to have something like a placeholder in my sitemesh decorator in where the custom from my decorated page will be placed (as you can understand I come from the django world :p). Is this possible ? Do you propose anything else or should I just put my jquery.js in the header and be done with it ?
To answer my question, after some search I found the following solution:
I Added the following to the end of my decorator page (after including jquery.js)
<decorator:getProperty property="page.local_script"></decorator:getProperty>
I also added the following
<content tag="local_script">
<script>
$(function() {
alert("Starting");
});
</script>
</content>
The decorated result page contained the contents of the local_script tag exactly where I wanted them and everything worked fine :)
I don't know why this feature of sitemesh is not properly documented - using this you can have a great templating behaviour (like django).
Related
I have two different divisions in a JSP page. One contains a menu of links, when clicked the div2 (id-content) loads different pages accordingly. I am doing something like -
<div id="menu">
<ul class="navbar">
<li><a name="login" href="Login.jsp" onclick="changeContent()">Login</a>
</li></div>
and in the script I have something as -
<script language="JavaScript">
function changeContent() {
document.getElementById('content').load('Login.jsp');
}
</script>
I also tried -
document.getElementById('content').innerHTML=
"<jsp:include page="Login.jsp">";
None of the ways worked. Please suggest how should I
Try jquery..
function changeContent() {
$('#content').load('Login.jsp');
}
The solution is to use Ajax, which will asynchronously retrieve your page content that can be pasted in with the innerHTML method. See my answer to a similar question of how an Ajax call works and some introductory links.
As to why your examples in your answer don't work, in the first case there is no load() method on an Element object (unless you've defined one yourself and not shown it). In the second example, as one of the question comments says, there is probably something causing a syntax error in the javascript.
As an FYI, when there is a syntax error in some javascript in a web page, the current expression being parsed and the rest of the <script></script> block will be ignored. Since this is inside a function declaration, that function will never get defined.
For instance, an embedded quote in the included page will end the string for the innerHTML assignment. Then the javascript parser will try to parse the remainder of the HTML causing a syntax error as the HTML will not be valid javascript.
We use jquery. Add a click event handler to the anchor elements. In the click handler call $('#content').load(your_url);. You might want to use the load(url, function() { ...}) version. More info here http://api.jquery.com/load/
Your initial page comes down from the server. It's displayed by the browser. When you click on a link (or a button) in the browser, you want to fill the second div with new HTML. This is is a perfect job for an AJAX request. What the AJAX object in the browser does, is to send a POST (or whatever) string to the server. And then the Ajax object receives the HTML response back from the server. And then you can display that response data which the AJAX object contains, anywhere you want.
I'm new to JSF and developing web applications with Java.
I'm basically developing a pretty complex interface, with lots of AJAX content loaded (Pagination, posts, comments, ...).
I'll start with a basic example, a user writes a comment. The form is sent through JSF f:ajax to the server and then I can do a render="sectionId", but the problem is, that I want to make the post not just appear, but slide down and even toggle background color.
How can I obtain this sort of effect using JSF and Javascript?
The designer (who knows only HTML/CSS/Javscript/Jquery) says that usually, he just does a Jquery AJAX call to a page with a string of data and then the page generates a JSON encode that he can then use to do all the magic.
I'm not asking how you do the toggle/color in jquery, it's the communication between the JSF and Javascript. So how can I send to his javascript the newly generated HTML code, so that he can what he wants with it.
Thanks for any help.
JSF is a server-side technology and you'd typically conditionally display content within
a construct such as a panelGroup, so why not include your jquery magic inside a ready
handler inside the conditionally rendered panelGroup like this:
<h:panelGroup id="ajaxRenderTarget">
<ui:repeat value="#{bean.listOfComments}" var="var">
... display required information ...
</ui:repeat>
<h:panelGroup rendered="#{bean.showJqueryEffects}">
<script type="text/javascript">
jQuery(function($) {
... funky effects here ...
});
</script>
</h:panelGroup>
</h:panelGroup>
Where I've used ui:repeat in the above example you could be and probably would be using any data iteration component from jsf or a component library such as a datatable.
Another thing to consider is OmniFaces which has <o:onloadScript> and a host of other tags which are worth knowing about.
One mistake to avoid is trying to load JSF pages using jQuery ajax functions, the server will have no state of the component tree and it won't work.
I have index page,which contain div section.i want to call different pages into this div section on the basis of her-link click,this is done. when calling pages that may also using ajax call,in this case ajax call not work for this page.please tell me it is possible to call ajax inside an ajax.if yes then please help me.
Update Edit:
I have created a gist where i have include all used pages,script https://gist.github.com/2786811.page service_status called the view.jsp using ajax call every 5 second,on hand view.jsp interact with database and prepare view.when we do ajax call from index.jsp, service_status called but it doesn't called view.jsp file.
Thanks
You can make ajax call on page load using $(document).ready(function () {...}); in target page you are calling.
If you are trying to dump a <script> tag with innerHTML, it won't work.
However, you could (as an example) return a JSON object with two properties:
{
html: "All your <b>HTML</b> here",
js: "alert('JavaScript to be run');"
}
Then, use the html property to put content on the page, and then eval the js property.
This isn't the best solution, since it uses the evil eval, but unless you want to rewrite your whole basic structure to use callbacks properly then it's probably your best bet.
I have page which consists of couple fragments and in the "header" fragment I have this tag <webuijsf:script id="script_logo" url="/resources/logo.js"/>. This is rendered in HTML as <script src="/app/resources/logo.js" type="text/javascript" id="Header:script_logo"></script>. This is fine and it is working as expected. Now I need to force JSF somehow to return URL to the javascript with current version of app. This is known technique for forcing the reload of resource (javascript, css and images) in case they are cashed on client's side. I need to render something like <script src="/app/resources/logo.js?ver=1.0.405" type="text/javascript" id="Header:script_logo"></script>. Please note the ver parameter in the URL.
Thanks.
Tomas
Well, you can simply add it to the page:
<script src="/app/resources/logo.js?ver=#{commonBean.version}" ...>
I've assumed you want to version to be configurable and sent by the server, so commonBean is some jsf bean that returns the proper version.
Update: also take a look at <rich:loadScritp>. (from RichFaces)
The final option is to create your own component and include the version automatically. Look for tutorial for how to make that, it's not easy for JSF 1.2
Well thats pretty easy. JSF 2 uses a configuration to Bind a renderer to a component.
Therefor you need a component-family and a renderer-type. Now you can define in your
faces-config.xml a renderer for that family and renderer-type.
In Mojorra the following configuration is set for a outputScript-Component:
<renderer>
<component-family>javax.faces.Output</component-family>
<renderer-type>javax.faces.resource.Script</renderer-type>
<renderer-class>com.sun.faces.renderkit.html_basic.ScriptRenderer</renderer-class>
</renderer>
I must admit, that this info is coming from my debugging. I debugged the ScriptRenderer
and was able to get the component-family and renderer-type from the UIComponent.
Now if you use an other Renderer for that Component, just change the configuration
and the original will be overwritten:
<renderer>
<component-family>javax.faces.Output</component-family>
<renderer-type>javax.faces.resource.Script</renderer-type>
<renderer-class>your.own.renderer.class</renderer-class>
</renderer>
Do not forget, all h:outputScript components will render now with the new Renderer.
Same goes with stylesheets, but those will have an other render-type.
Do anyone know how to put Google adsense ads inside a GWT web application?
You can put the javascript-code from Adsense in the single HTML page that GWT starts with. This way the advertising will not be displayed in the same area as GTW but above/below the GWT code. For advertising that could be ok.
This example places a baner above the application:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>www.javaoracleblog.com</title>
<script type="text/javascript" language="javascript" src="com.javaoracleblog.aggregator.nocache.js"></script>
</head>
<body>
<script type="text/javascript"..
ADsense code here
</script>
<!-- OPTIONAL: include this if you want history support -->
<iframe src="javascript:''" id="__gwt_historyFrame" tabIndex='-1' style="position:absolute;width:0;height:0;border:0"></iframe>
</body>
</html>
In order to indicate to Google WT that the site of Google adsense can be trusted you need to add a regex matching URL to the -whitelist command line argument.
Note that this will probably not solve the problems desribed in the above "Why I dumped GWT" article.
According to this thread on AdSense:
Short version, you can't use Adsense
via Ajax without breaking the
programme policies/t&c's
Long version...
Ad code passed through an xmlhttp call
is not rendered, it's just treated as
text (hence, responseText). The only
way to execute js code is to use
"responseXML" coupled with the
"exec()" command.
For instance...
If your xml contains something along
the lines of:
This is the
content from the external
file javascript code
goes here
You would assign a variable (called
page_data for instance) using
ajax_obj.responseXML, run the XML
through a parser and run
exec(js variable or line from XML
here);
Not really helpful from an Adsense
standpoint, but that's how it's done.
It's also worth mentioning Why I dumped GWT:
Another problem were my adsense
banners. Since I didn’t have a lot of
content on the page, the banners were
sometimes off topic. An even bigger
problem was that the banners stayed
the same when people searched for
different keywords (since the ajax
refresh didn’t trigger an adsense
refresh). I solved this by doing the
search with a page refresh instead of
an ajax call. The ajax part of the
site was limited to sorting, faceting,
i18n and displaying tips.
You might check out the interview I did with InfoQ. It includes a sample chapter from my book and it happens to be on SEO.
It's not trivial, but I think the solutions in the chapter let GWT work nicely in an environment where SEO is important. The basic solution is to implement something I call 'bootstrapping'. This means that your pages take the info that would normally come across in GWT-RPC requests and serialize them into the page. The GWT widget then loads this information without an RPC request. While your page serializes the info into JavaScript, it's easy to also write a <noscript> to the page that can be used for SEO.
Take a look at the PDF included here: InfoQ GWT it goes into all the detail. The whole sample project is here: google code with source on github.
If you really want AdSense to be kinda "inside" GWT I'd use the Frame widget. Basically the Frame widget generates an <iframe ...> inside your GWT code. First I've thought iframe, UGH! But the <iframe> tag is still part of the HTML5 spec and has been even extended by some attributes that seem to be there for exactly this "sandboxing" purpose. And with corresponding CSS styling you will not have any scrollbars around your <iframe>.
And here is the actual solution:
You should put
<ui:style>
.sponsor {
border: 0em;
width: 20em;
height: 6em;
float: right;
display: inline;
}
</ui:style>
<g:HTMLPanel>
<g:Frame ui:field="sponsor" url="issue/extern/Google-AdSense.html" styleName="{style.sponsor}"/>
</g:HTMLPanel>
into your .ui.xml file and the logic into the corresponding .java file:
#UiField
Frame sponsor;
Also you should put the actual Google AdSense code (the <script> stuff) into a separate HTML file inside GWT's public folder which is - in this case - called Google-AdSense.html and is located inside the extern folder inside the public folder. issue (in the Frame url attribute) is in this case the GWT output folder.
And here is how it looks like: The ad in the upper right corner.
Btw this is also the way to embed the Google Analytics code into GWT.
Here is how I do it. I have a demo and source code here: http://code.google.com/p/gwt-examples/wiki/DemoGwtAdsene
You can use AdSense and GWT together without using frames or other hacks if you take some care in how you create your host pages.
The key is to include your AdSense code in the host page and then to manipulate the dom element containing the ad but to not detach it from the page. So you can reposition the ads into the body of your other gwt code as long as the dom structure is not changed.
If you do detach and reattach the containing dom element then it will appear to work in Chrome and Firefox but IE will show a blank space. I tried initially to move the ads DIV element into a DockLayoutPanel and thought everything was great until I belatedly tested it in IE.
So this is OK:
Element element = Document.get().getElmentById("ad");
element.getStyle().setPosition(ABSOLUTE);
element.getStyle().setTop(20, PX);
But this is not:
myPanel.add(ElementWrapper.wrap(element));
because adding a widget to another widget re-parents it.
This means that you cannot use any of the built-in LayoutPanel stuff to hold your ad div because Layout cannot wrap an existing element (It creates its own DIV in its constructor). You may be able to modify the layout panel stuff so it wraps an element and does not re-parent it... but I have not tried this yet.
I've tested the results in IE6+, Chrome and Firefox. Downside is that you cannot refresh the ads unless you load a new page. But in my case GWT was used to enhance html pages so that was not an issue. In any case... are users more likely to click on a different ad than one they read several times? Not sure it is so vital.
I could do this using DFP Small Business + Async Publisher tag + AdSense integration:
Here is the code:
On of your host page, put your publisher tag, something like:
<head>
<script type="text/javascript" src="http://www.googletagservices.com/tag/js/gpt.js"></script>
<script type="text/javascript">
var slot1 = googletag.defineUnit('/XXXX/ca-pub-YYYYYYYYYYYYYYY/transaction', [468, 60], 'div-gpt-ad-ZZZZZZZ-0').addService(googletag.pubads());
googletag.pubads().enableSingleRequest();
googletag.enableServices();
</script>
...
</head>
I've created a view with uiBinder, with a div with the id specified at the head, like this:
<g:HTMLPanel height="62px" width="100%">
<div id='div-gpt-ad-ZZZZZZZ-0' style='width:470px; height:60px;'>
</div>
</g:HTMLPanel>
On the onLoad() method of the view, you initialize the ad, like this:
#Override
protected void onLoad() {
setupAd();
}
public static native void setupAd() /*-{
$wnd.googletag.cmd.push(function() {$wnd.googletag.display('div-gpt-ad-ZZZZZZZ-0')});
}-*/;
To refresh the ad, just call refresh ad for the slot specified at head:
public static native void refreshAd() /*-{
$wnd.googletag.pubads().refresh([$wnd.slot1]);
}-*/;
That's all!
For more information about the publisher tag, check:
http://support.google.com/dfp_sb/bin/answer.py?hl=en&answer=1649768
Now I'm struggling to know how to make AdSense bot to craw my ajax application. I've implemented the Ajax Crawling scheme:
https://developers.google.com/webmasters/ajax-crawling/docs/getting-started
But I've got the information from AdSense forum that the AdSense bot (Mediapartners-Google) doesn't work with "escaped fragment" Ajax scheme.
Does anybody know if Google plan to make any progress on that?
This limits this approach to serve just interest based ads, since the context based ad serving depends on ajax crawling scheme.
Google's AdSense bot crawls your page to determine what ads to serve. Therefore, you should not put AdSense on pages with mostly dynamic content. It won't work well.
Maybe you should look into other ad programs?