Conditionally displaying JSF components

Question

First  I am new to Java EE  came from a strong ASP  NET development background  I have gone through the net  and I might miss this but it seems like there is no simple and straight-to-the-point tutorials on how I could connect backing bean class to a JSF components   A good example is like this  currently I am trying to create a JSF page where there is a set of links as menu bar and a set of forms  What I am planning to do is  when clicking a link  a particular form will be rendered    In ASP NET  I could easily retrieve the element and then set the attribute to be displayable  I am wondering if there is easy way  heck  even any way  to do this in JSF   The forms is already in the page  it is just a matter of setting the  render  attribute to true when I click a particular link

User · Answer

In addition to previous post you can have   lt h form rendered     bean boolvalue     gt   lt h form rendered    bean textvalue     value      gt    Jsf 2 0

User · Answer

Yes  use the rendered attribute   lt h form rendered  quot   some boolean condition  quot  gt   You usually tie it to the model rather than letting the model grab the component and manipulate it  E g   lt h form rendered  quot   bean booleanValue  quot    gt   lt h form rendered  quot   bean intValue gt 10  quot    gt   lt h form rendered  quot   bean objectValue eq null  quot    gt   lt h form rendered  quot   bean stringValue ne  someValue   quot    gt   lt h form rendered  quot   not empty bean collectionValue  quot    gt   lt h form rendered  quot   not bean booleanValue and bean intValue ne 0  quot    gt   lt h form rendered  quot   bean enumValue eq  ONE  or bean enumValue eq  TWO   quot    gt   Note the importance of keyword based EL operators such as gt  ge  le and lt instead of  gt    gt     lt   and  lt  as angle brackets  lt  and  gt  are reserved characters in XML  See also this related Q amp A  Error parsing XHTML  The content of elements must consist of well-formed character data or markup  As to your specific use case  let s assume that the link is passing a parameter like below   lt a href  quot page xhtml form 1 quot  gt link lt  a gt   You can then show the form as below   lt h form rendered  quot   param form eq  1   quot  gt    the   param  is an implicit EL object referring to a Map representing the request parameters  See also   Java EE 6 tutorial - Expression Language How to show JSF components if list is not null and has size    gt  0 Why do I need to nest a component with rendered  quot   some  quot  in another component when I want to ajax-update it

[jsf] Conditionally displaying JSF components

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