brucepomeroy
Specifically when only a substring in an attribute’s value if dynamic. Here’s a concrete example. I’m translating some templates from .leex to .heex. I’m interested in ideas for translating this:
<div class="<%= if @published, do: "bg-green", else: "bg-red" %> text-white text-small border-grey">...</div>
This doesn’t seem to be supported, it generates a compile error:
<div class="{if @published, do: "bg-green", else: "bg-red"} text-white text-small border-grey">...</div>
I could create an additional assign called @bg_color and do this:
<div class="{@bg_color} text-white">...</div>
Or duplicate the common classes like this:
<div class={if @published, do: "bg-green text-white text-small border-grey", else: "bg-red text-white text-small border-grey"}>...</div>
Interested to hear if there are any other approaches.
Thanks!
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axelson
One way you could write this is:
<div class={“#{if @published, do: "bg-green", else: "bg-red"} text-white text-small border-grey"}>...</div>Although there may be a clearer way.
trisolaran
Another way to do this:
That is, using a list instead of string interpolation. This is however neither more concise nor better than @axelson’s solution, it’s just different. It may appeal to you if you prefer to use a list for your classes.
A more elegant way would be if LV allowed things like this:
Like some front-end frameworks (e.g. Vuejs) already do. I was told that Surface supports this notation, though I haven’t tested it. I’m sure that LiveView will catch up at some point
brucepomeroy
Great, thanks so much @axelson and @trisolaran , both approaches are big improvements. Thanks again!
emiltin
You can join strings:
Note the space after “border-gray”
krishandley
Depending on your use case you could also do this…