What do {!expressions} refer to when used in Visualforce components?

Hi Prachi,

Expressions allow you to make calculations and access property values and other data within component markup. Use expressions for dynamic output or passing values into components by assigning them to attributes.
An expression is any set of literal values, variables, sub-expressions, or operators that can be resolved to a single value. Method calls are not allowed in expressions.

A Visualforce expression is any set of literal values, variables, sub-expressions, or operators that can be resolved to a single value. Method calls aren't allowed inexpressions. Anything inside the {! } delimiters is evaluated and dynamically replaced when the page is rendered or when the value is used.

Thanks

Hi,

We use expressions for dynamic output or passing values into components by assigning them to attributes. A Visualforce expression is same as in other languages (Java, C or C++ etc). It is aset of literal values, variables, sub-expressions, or operators that can be resolved to a single value.

For Example : - {!x+y} will give you a sum of two getter setter variable(x and y).

Hope this helps.