question How to use conditions in Jelly? in Developer forum

How to use conditions in Jelly?

nachosg — Fri, 13 May 2022 09:30:02 GMT

Hello,

I am developing an UI page using Jelly. I am struggling with this because I am not being able to understand how the conditions work.

In summary, I need to show a message depending on a condition (I need a function to retrieve an array and if this array is empty or not, I will show one message or another). I have been testing and I have not been able to do it.

This is my code:

<?xml version="1.0" encoding="utf-8"?>

<j:jelly xmlns:j="jelly:core" xmlns:g="glide" xmlns:j2="null" xmlns:g2="null" trim="false">

    <g2:evaluate var="jvar_reasons" object="true">

      

        var reasons = new ReasonManager().retrieveReasons();

        reasons;

    </g2:evaluate>

    <g2:evaluate var="jvar_no_error" object="true" jelly ="true">

      

        var reasons = jelly.jvar_reasons;

        var length = reasons.length;

        var result = length > 0;

        result;

    </g2:evaluate>

    <j:set var="jvar_test" value="$[result]"/>

    <j:if test="true">

         1

    </j:if>

    <j:if test="$[result]">

        2

    </j:if>

    <j:if test="${jvar_test}">

        3

    </j:if>

    ${jvar_test}

    $[jvar_no_error]

</j:jelly>

The only number that is being showed is the "1". But, it's very strange because when I show the variables "jvar_test" and "jvar_no_error", both are true. I would really appreciate any help with this issue.

Thanks.

Re: How to use conditions in Jelly?

Ankur Bawiskar — Fri, 13 May 2022 09:50:36 GMT

Hi,

try to use toString() to compare

Also use j2 since you are using phase 2

<?xml version="1.0" encoding="utf-8"?>

<j:jelly xmlns:j="jelly:core" xmlns:g="glide" xmlns:j2="null" xmlns:g2="null" trim="false">

   <g2:evaluate var="jvar_reasons" object="true">
       var reasons = new ReasonManager().retrieveReasons();
       reasons;
   </g2:evaluate>

   <g2:evaluate var="jvar_no_error" object="true" jelly ="true">
       var reasons = jelly.jvar_reasons;
       var length = reasons.length;
       var result = length > 0;
       result;
   </g2:evaluate>

   <j2:if test="$[jvar_no_error.toString() == 'true]">
       2
   </j2:if>

</j:jelly>

Regards
Ankur

Re: How to use conditions in Jelly?

nachosg — Fri, 13 May 2022 11:38:19 GMT

I didn't need to use the "toString()", only with j2 I have achieved to show the numbers.

The code :

<?xml version="1.0" encoding="utf-8"?>

<j:jelly xmlns:j="jelly:core" xmlns:g="glide" xmlns:j2="null" xmlns:g2="null" trim="false">

    <g2:evaluate var="jvar_reasons" object="true">
        var reasons = new ReasonManager().retrieveReasons();
        reasons;
    </g2:evaluate>

    <g2:evaluate var="jvar_no_error" object="true" jelly ="true">
        var reasons = jelly.jvar_reasons;
        var length = reasons.length;
        var result = length > 0;
        result;
    </g2:evaluate>

    <j2:if test="$[jvar_no_error]">
        2
    </j2:if>

</j:jelly>

Re: How to use conditions in Jelly?

Ankur Bawiskar — Fri, 13 May 2022 12:10:58 GMT

@nachosg

Did you mistakenly marked your own response as correct?

I also mentioned the same to use j2 tag

Please mark appropriate response as correct.

Regards
Ankur