Added tutorial page for TExpression and TStatements.

1 files changed, 21 insertions, 1 deletions

diff --git a/demos/quickstart/protected/pages/Controls/Expression.page b/demos/quickstart/protected/pages/Controls/Expression.page
index 767f292f..efa1ab7a 100644
--- a/demos/quickstart/protected/pages/Controls/Expression.page
+++ b/demos/quickstart/protected/pages/Controls/Expression.page
@@ -4,7 +4,27 @@
 <com:DocLink ClassPath="System.Web.UI.WebControls.TExpression" />

 

 <p>

-TBD

+<tt>TExpression</tt> evaluates a PHP expression and displays the evaluation result. To specify the expression to be evaluated, set the <tt>Expression</tt> property. In a control template, <a href="?page=Configurations.Templates2#et">expression tags</a> are often used instead of the complete <a href="?page=Configurations.Templates1#ct">component tags</a> when the main purpose is to display the evaluation result of some PHP expression. For example, the following two tags are equivalent,

+</p>

+<com:TTextHighlighter Language="prado" CssClass="source">

+&lt;com:TExpression Expression="date()" /&gt;

+&lt;%= date() %&gt;

+</com:TTextHighlighter>

+

+<p>

+<tt>TExpression</tt> evaluates the expression during the rendering control lifecycle.

+</p>

+

+<p>

+The context of the expression in a <tt>TExpression</tt> control is the control itself. That is, <tt>$this</tt> represents the control object if it is present in the expression. For example, both of the following template tags will display the title of the page containing the <tt>TExpression</tt> control.

+</p>

+<com:TTextHighlighter Language="prado" CssClass="source">

+&lt;com:TExpression Expression="$this->Page->Title" /&gt;

+&lt;%= $this->Page->Title %&gt;

+</com:TTextHighlighter>

+

+<p>

+Be aware, since <tt>TExpression</tt> allows execution of arbitrary PHP code, in general you should not use it to evaluate expressions submitted by your application users.

 </p>

 

 </com:TContent>
\ No newline at end of file