kindly refer the below technow youtube video . i would suggest here to watch all part one , two and three episode .
Usually, there are two phases indicated by namespaces <j> versus <j2> and <g> versus <g2>.
The namespaces without the "2" happen in the first phase of processing and these are cached except when used in a UI page. Those with the "2" are never cached. Care must be taken when selecting whether to use phase 1 or phase 2 for efficiency and correct results.
In addition to the namespaces, the syntax used to insert values into static content differs depending on which phase is to supply the value. A dollar with braces surrounding a value inserts the value in phase 1. For example, ${jvar_ref} inserts the value jvar_ref during phase 1 of the jelly process. A dollar with brackets surrounding a value inserts the value in phase 2. For example, $[jvar_ref] inserts the value jvar_ref during phase 2. A value surrounded by quotes is treated as a string. For example, '[jvar_ref]' inserts the value jvar_ref as a string during phase 2.
<script>
if (confirm("$[gs.getMessage('home.delete.confirm') ]"))
...
</script>
<input type="hidden" id="${jvar_name}" name="${jvar_name}" value="${jvar_value}" class="${jvar_class}" />
