In this section, you will get a brief description about Expression Language of JSF.
In this section, you will get a brief description about Expression Language of JSF.In this section, you will get a brief description about Expression Language of JSF.
Expression Language is used to access the JavaBeans component in the JSF web application.
The syntax of the EL expression is :
# { expression }It is similar to JSP expression language but have following differences from it :
The JSF EL supports following literals :
The Operators supported by JSF EL with operators precedence , from left to right(highest to lowest), is given below :
Some of Example of EL is given below :
JSF EL Expression | Result |
${1 > (4/2)} | false |
${4.0 >= 3} | true |
${100.0 == 100} | true |
${(10*10) ne 100} | false |
${?a? < ?b?} | true |
${?hip? gt ?hit?} | false |
${4 > 3} | true |
${1.2E4 + 1.4} | 12001.4 |
${3 div 4} | 0.75 |
${10 mod 4} | 2 |
${!empty param.Add} | False if the request parameter named Add is null or an empty string. |
${pageContext.request.contextPath} | The context path |
${sessionScope.cart.numberOfItems} | The value of the numberOfItems property of the session-scoped attribute named cart. |
${param[?mycom.productId?]} | The value of the request parameter named mycom.productId. |
${header["host"]} | The host |
${departments[deptName]} | The value of the entry named deptName in the departments map |
${requestScope[?javax.servlet.forward.servlet_path?]} | The value of the request-scoped attribute named javax.servlet.forward.servlet_path |
#{customer.lName} | Gets the value of the property lName from the customer bean during an initial request. Sets the value of lName during a postback |
#{customer.calcTotal} | The return value of the method calcTotal of the customer bean. |
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