# What is Jelly

Jelly is executable XML. Jelly maps “tags” to Java classes. Glide uses a two phase approach.

• Phase 1 processes ${}, <g:namespace>, and <j:namespace> things. • Phase 2 processes $[], <g2:namespace>, and <j2:namespace> things.

This is light list of things I use in Jelly normally.

I got this information from these places;

## Tags

Here’s a list of tags I generally use when working with Jelly. There are other tags, but I find my use of them the exception, not the rule.

### Set

<j:set var="jvar_element_id" value="I have value!"/>

<j:if test="${empty(jvar_something)}"> Only shows if jvar_something is empty! </j:if>  ### Set If <g2:set_if var="jvar_style" test="$[gs.getPreference('table.compact') != 'false']"
true="margin-top:0px; margin-bottom:0px;"
false="margin-top:2px; margin-bottom:2px;" />


### Insert

<g:insert>, inserts a jelly file into your jelly in a new context, meaning you can not access variables previously established in your Jelly.

<g:insert template="get_target_form_function.xml" />


### Inline

<g:inline>, inserts a jelly file into your jelly in the same context, meaning you can acccess variables previously established in your Jelly.

<g:inline template="element_default.xml" />


### Call

<g:call>, has better encapulation than the above two. In short, you can pass values, but you can’t access variables previously established in your Jelly unless explicitly passed.

<g:call function="collapsing_image.xml"
id="${jvar_section_id}" image="$[jvar_cimg]"
first_section_id="${jvar_first_section_id}" image_alt="${jvar_cimg_alt}"/>


### Evaluate

<g:evaluate> tag is used to evaluate an expression in Rhino Javascript. The last statement in the expression is the value the variable will contain. If you would like to have the evaluate return an object (for example an array), use the argument object=“true”.

<g2:evaluate var="jvar_page" jelly="true" object="true">
var users = [];
var sys_user = new GlideRecord("sys_user");
sys_user.query();
while (sys_user.next()) {
users.push(sys_user.getValue("name"));
}
users;
</g2:evaluate>
<g2:evaluate var="not_important" expression="sc_req_item.popCurrent()"/>


## Escaping

Escaping is hell with Jelly and XML. Anything you’d think about escaping is probably wrong. Here’s the short of it.

### Characters

Desired Character Phase 1 Phase 2
& ${AMP} $[AMP]
< ${AMP}lt; $[AMP]lt;
> ${AMP}gt; $[AMP]gt;
${SP} $[SP]

### Values

${test.getHTMLValue()}${JS:expression}
${HTML:expression}  Sometimes you need to call <g:no_escape>${jvar_t}</g:no_escape>.

## RP aka RenderProperties

Docs

### getParameterValue

RP.getParameterValue('r');// would return url r= value