UI Page HTML variable in gliderecord

[DoDo labs___]

Hello

If I put the sys_id in the UI Page HTML script, the gliderecord works, but if I insert the variable, it doesn't.
I intentionally write out the value of the variable and it writes out the good sys_id.
Can anyone help?

<j:set var="jvar_pref" value="${sysparm_changeID}"/>

<p>${jvar_pref}</p>

<g:evaluate var="jvar_now_GR" object="true" jelly="true">

    var now_GR = new GlideRecord("checklist_item");

    now_GR.addQuery('checklist', ${jvar_pref});

    now_GR.query();

    now_GR;

</g:evaluate>

[DoDo labs___ · Accepted solution]

I found the solution, it has to be put between apostrophes!

<j:set var="jvar_pref" value="${sysparm_changeID}"/>

<p>${jvar_pref}</p>

<g:evaluate var="jvar_now_GR" object="true" jelly="true">

    var now_GR = new GlideRecord("checklist_item");

    now_GR.addQuery('checklist', '${jvar_pref}');

    now_GR.query();

    now_GR;

</g:evaluate>