Forum Discussion

bryanpollack's avatar
bryanpollack
Ace
11 years ago

Passing integers/booleans to a custom component

For some reason, I can pass an object variable or a hard-coded string to a custom component and retrieve it using env.context.component.getParameter, but when I try to pass an integer variable or a hard-coded boolean, it seems to error when it tries to retrieve the parameter and complains about a null value. 

This is my call:

 

<#assign numReplies = (thread.messages.linear.message?size - 1) />
<@component id="Message" message=starter numReplies=numReplies showSubject="true" />

 

And my retrieving code:

 

<#attempt>
<#assign showSubject = (env.context.component.getParameter('showSubject') == "true") />
<#recover>
<#assign showSubject = true />
</#attempt>
<#attempt>
<#assign numReplies = env.context.component.getParameter('numReplies') />
<#recover>
<#assign numReplies = 0 /> -- ends up going here because numReplies is null
</#attempt>

 

Thanks!

  • nathan's avatar
    nathan
    Executive
    11 years ago

    Haven't come across this issue before, but my guess would be that component parameters only accept certain data types. You could probably get around the issue by wrapping the values in a basic hashmap object.

    Have you tried something like this?

    <@component id="Message" message=starter customParams={"numReplies": numReplies, "showSubject": true} />


    <#attempt>
    <#assign showSubject = (env.context.component.getParameter('customParams').showSubject) />
    <#recover>
    <#assign showSubject = true />
    </#attempt>
    <#attempt>
    <#assign numReplies = env.context.component.getParameter('customParams').numReplies />
    <#recover>
    <#assign numReplies = 0 />
    </#attempt>

     

    • bryanpollack's avatar
      bryanpollack
      Ace
      11 years ago
      I seem to get the same null/missing error when I try to pass the object. I tried assigning the object to a variable, and then accessing the object before I call the component, and that seems to work fine. Do you know if there's a way to create an XML object (or whatever kind of object is created by restadmin), as that seems to be the only kind of object I can pass, aside from a string.
  • samudhraa's avatar
    samudhraa
    Expert
    11 years ago

    Hi Braynpollock,

     

    I think its mentioned in the  tkb post that parameters can only be of the type string. One of the workaround could be , for you to pass the message size as string , and then convert it to number using something like ,

    <#assign numReplies = (thread.messages.linear.message?size - 1) />

    <#assign numReplies = numReplies?string />

    <@component id="Message" message=starter numReplies=numReplies  showSubject="true" />

     

    and later in the component Message , 

    <#assign numReplies = env.context.component.getParameter('numReplies') />

    after the attempt part , when you are about to use the variable , you can convert it to number .

    <#assign numReplies = numReplies?number />

     

    Hope that helps .

     

    Thanks,

    Sam