Using greater than logical expression in rendered attribute

Question

I have an outputText field for which I write a condition in the rendered attribute. The condition is for comparing the length of the string with some numeric value.

<h:outputText id="emailaddress" 
    value ="#{subsAlertsHelper.personEmail.substring(0,20)}"
    rendered="#{subsAlertsHelper.personEmail.length() >20}" />

If I use == or != in rendered it is working fine. But for greaterthan and lessthan it is not giving the output. What could be the reason for that?

dertkw · Answer 1 · 2013-02-12T16:49:51.587

50

You have to use gt and lt operators.

Check out JavaServer Faces Expression Language Intro from Sun/Oracle. Precisely the Operators section.

edited Feb 12 '13 at 16:49

answered Aug 22 '11 at 11:04

dertkw

7,798
5
37
45

2

Indeed, the reason is that `<` and `>` are special characters in XHTML. When you have used JSP, this would have worked. – BalusC Aug 22 '11 at 13:06
What is the operator for greater than equal to – Ganesa Vijayakumar Nov 28 '13 at 13:21
2

@Ganesh It's `ge`. Check out the link from the answer, especially the chapter _Operators_. – dertkw Nov 28 '13 at 13:36

score 3 · Answer 2 · answered Aug 22 '11 at 09:50

3

rendered only accepts EL expression.

subsAlertsHelper.personEmail.length() is incorrect.

On the personEmail object, add a method getLength() witch returns the length

public int getLength(){ return this. length();}

Modify :

rendered="#{subsAlertsHelper.personEmail.length >20}"

answered Aug 22 '11 at 09:50

Jean-Charles

1,690
17
28

Also try gt rendered="#{subsAlertsHelper.personEmail.length gt 20}" – Jean-Charles Aug 22 '11 at 09:52
3

Keep yourself up to date. Read on about EL 2.2 which was introduced with Servlet 3.0 around Dec 2009. Invoking non-getter methods directly is allowed since EL 2.2, also with arguments. – BalusC Aug 22 '11 at 12:52
I currently only use JSF 1.2 and never have to work with EL 2.2. You're right. Sorry for this answer... My comment is probably most appropriate (about the use of gt). – Jean-Charles Aug 22 '11 at 13:01

Using greater than logical expression in rendered attribute

2 Answers2

Linked