I work in solid-js. I created in my project a url variable. My application must display a chat creation button to the user if the value does not the url variable exists and a message You cannot create a whelpschat if the variable has a null value. For this, I created a conditional structure in solid-js:

<Show when={open()}>

         <Show when={url()?.trim().length}>
              ...
           <CreateChat/>
             ...
         </Show>
         <Show when={!url()?.trim().length}>
                ...
         You cannot create a whelpschat 
             ...
         </Show>
</Show>

When I test, when the url variable has a null value, it displays the message You cannot create a whelpschat; but when I assign a value to the url variable for example banana, it always displays the message instead of the button. However, given that the variable does indeed have a non-zero value, it is the button that should normally have been displayed. I don't understand why this isn't working. I hope I can get help from more experienced members of the community. Thanks !