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Calling method during onload of jsf page

Jack pero

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posted 16 years ago

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Hi,
i want to call a mehtod when the page loads in JSF. Could anyone help me out for this..
thanks..
vin

Jolie Lee

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posted 16 years ago

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you can try body on~load calls a javascript method, then in the javascript method calls a commandbutton which is hidden. that commandbutton can then call a method in your backing bean.

Jys <a href="http://jy-s.com" target="_blank" rel="nofollow">http://jy-s.com</a> Trying my very best to learn java, please forgive me if i'm asking some really stupid questions.

Jack pero

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posted 16 years ago

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Thanks, but can we used "rendered" somwhere in this.

jack..
"find a way, or make the one"

John Bartlett

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posted 16 years ago

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Hey,

Can you not use shale for this, implementing shales view controller means you can override methods such as init(), preprocess() and prerender().

John
[ February 14, 2007: Message edited by: John Bartlett ]

rajani varma

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posted 16 years ago

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Hi,

The commandButton has rendered attribute. You can use it.

For eg.

-Rajani.

Jolie Lee

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posted 16 years ago

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yes, commandButton can use rendered but you still need to trigger the button action so that it can calls your backing bean method. rendered can't triggered the action.

Jys <a href="http://jy-s.com" target="_blank" rel="nofollow">http://jy-s.com</a> Trying my very best to learn java, please forgive me if i'm asking some really stupid questions.

Jack pero

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posted 16 years ago

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thanks, the rendered thing solved the problem..

jack

joshua asem

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posted 14 years ago

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How does the rendered thing solved the problem? Can someone explain the details on this?
Just wondering if there is any way without calling <onload="test()">, to solve this requirement.
Can anyone give a pointer on this? Thanks.

Cheers,
Joshua

kumar Rathinam

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posted 12 years ago

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Jolie Lee wrote:you can try body on~load calls a javascript method, then in the javascript method calls a commandbutton which is hidden. that commandbutton can then call a method in your backing bean.

function test(){
document.getElementById('formName:buttonId').click();
}

<body on~load="test();">

<h:commandButton action="#{backingBean.methodName}" id="buttonId" style="display: none"/>
</body>

Hi i am trying to use the function on body onload .its hitting more then once test();
Test function is called endless loop...

Thanks
kumar

Stefan Frings

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posted 12 years ago

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The hidden button does not work beause the action handler answers with a page, which is the same page in this case. So the page will get re-loaded and because the onload script clicks the button again, the page gets reloaded in an endless loop.

Sometimes the solution is so easy to oversee it:

This calls the init method when the page gets loaded.

If you use the older JSF 1.2 release, then write #{myBean.init} and name the method getInit().

Rodney Hirokane

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posted 12 years ago

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Stefan Frings wrote:The hidden button does not work beause the action handler answers with a page, which is the same page in this case. So the page will get re-loaded and because the onload script clicks the button again, the page gets reloaded in an endless loop.

Sometimes the solution is so easy to oversee it:

<html> <h:body> #{myBean.init ... Whatever else the page shall contain ... </h:body> </html>

class myBean { public String init() { ... do something ... return null; } }

This calls the init method when the page gets loaded.

If you use the older JSF 1.2 release, then write #{myBean.init} and name the method getInit().

I could not get this solution to work in my case. I created a web page where the submit button executes myBean.method. I need to eventually remove the Submit button and for myBean.method to be executed when the page is loaded. Here is the code for the submit button

<h:commandButton action="#{agencySecurityProfileBean.submit}" value="Submit" styleClass="button" />

Besides including a hidden command button as listed in the previous posts is there a better alternative to resolving this issue or has anyone gotten the simple solution as quoted in this post to work?

Much appreciated,

Rod

Samuel Younge

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posted 11 years ago

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Stefan Frings wrote:The hidden button does not work beause the action handler answers with a page, which is the same page in this case. So the page will get re-loaded and because the onload script clicks the button again, the page gets reloaded in an endless loop.

Sometimes the solution is so easy to oversee it:

<html> <h:body> #{myBean.init ... Whatever else the page shall contain ... </h:body> </html>

class myBean { public String init() { ... do something ... return null; } }

This calls the init method when the page gets loaded.

If you use the older JSF 1.2 release, then write #{myBean.init} and name the method getInit().

***

I was able to get the above post to work but I ended up putting the call in between the <head> tags and modifying it slightly.
Section of my index.xhtml

Method in my Managed Bean Controller msbController.java

Notice the addition of parenthesis after the init method name.
Works like a champ thanks Stefan!

Also, some people may do fine just adding the code they want to execute on page load in the managed bean controller's constructor method.

Samuel

Tim Holloway

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195

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posted 11 years ago

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Welcome to the JavaRanch, Samuel!

What you have done is what we call "awakening a zombie" - posting to a thread that has been dormant for so long that most of the people involved have probably moved on to other projects and often other employers. We'd prefer that you simply start a new thread rather than do this, as it's less confusing.

BTW. JSF backing beans are not Controllers, they are Models.

The secret of how to be miserable is to constantly expect things are going to happen the way that they are "supposed" to happen.

You can have faith, which carries the understanding that you may be disappointed. Then there's being a willfully-blind idiot, which virtually guarantees it.

Time is mother nature's way of keeping everything from happening at once. And this is a tiny ad:

a bit of art, as a gift, that will fit in a stocking

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