Client side rendering (wp-each and other directives) #58572
Replies: 1 comment 1 reply
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This is the perfect place 🙂
Exactly, we didn't want to support that to avoid opening a can of security problems. Also, it's not only about your own code. If a block uses that syntax, all the sites that use that block can't enable a strong CSP anymore, which could lead to exploits in other areas of your site. We do support a single negation operator, though, because that's safe to read/parse and very handy: <span data-wp-bind--hidden="!context.isOpen">Opened!</span>
<span data-wp-bind--hidden="context.isOpen">Closed!</span>
That's a perfectly valid usage of "derived state". Basically, it would work like this: <template data-wp-each--filter="state.filters">
<span
data-wp-class--is-active="state.isCurrentFilter"
data-filter="context.filter.id"
data-wp-text="context.filter.name"
></span>
</template> store("myPlugin", {
state: {
filters: [],
get isCurrentFilter() {
const { filter } = getContext();
return filter.id === filter.name;
},
},
});
Yes. If you want to access the element attributes, you can use the store("myPlugin", {
state: {
get isCurrentFilter() {
const { attributes } = getElement();
const { currentFilter } = getContext();
return attributes["data-filter"] === currentFilter;
},
},
});
You can use attributes (as in the example above) or context, whatever suits your case better. Same example with context instead of attributes: <div data-wp-context='{ "filter": "some filter" }'></div> store("myPlugin", {
state: {
get isCurrentFilter() {
const { currentFilter, filter } = getContext();
return filter === currentFilter;
},
},
});
We had that at the very beginning but it was not clear how to do the server directive processing so removed it in favor of We still want to add it though, because it has some benefits in some cases. There is a conversation about how it should work here, in case you want to participate:
You can use the negation operator to avoid one piece of state: <span data-wp-bind--hidden="!state.hasLiveLink">...</span>
<span data-wp-bind--hidden="state.hasLiveLink">...</span> By the way, even though callbacks work fine in the client (any function works), you should also use derived state (getters) instead of callback functions when passing state to the directives. store("myPlugin", {
state: {
get hasLiveLink() {
const { context } = getContext();
return !!context.event.liveLink;
},
},
}); Then, when you need to use it in another action/derived-state, it's as if it was a piece of state. const { state } = store("myPlugin", {
state: {
get hasLiveLink() {
const { context } = getContext();
return !!context.event.liveLink;
},
},
actions: {
setLiveLink() {
if (state.hasLiveLink) {
// do something...
} else {
// do something else...
}
},
},
}); It's also a bit more performant because underneath we are wrapping those getters with Preact's
I'd appreciate it if you could test the new There's one thing that we don't support yet in the server, though. We don't support passing a function like store("myPlugin", {
state: {
get isCurrentFilter() {
const { filter } = getContext();
return filter.id === filter.name;
},
},
}); But the rest should work. You just have to do this: wp_interactivity_state("myPlugin", array(
'filters' => array( ... ),
'isCurrentFilter' => false // This needs to be static.
)); In the future, you will be able to do something like this: wp_interactivity_state("myPlugin", array(
'filters' => array( ... ),
'isCurrentFilter' => function() {
// This can be dynamic.
$context = wp_interactivity_get_context();
return $context['filter']['id'] === $context['filter']['name'];
}
)); Thank you! 🙏 cc: @DAreRodz, it looks like supporting functions might be more important than we thought because of |
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Let me prefix everything here with: I initially was skeptical whether the interactivit API would be a good addition to WordPress, since there are already things like AlpineJS wildly used in the web dev community. That's why I'm trying to build things with the interactivity API to get a better feeling for it. And I have to say so far, that I can really imagine using it for things like filterable lists, querying, client side navigation etc. I know that this API is still in an early phase and experimental, but what I see so far seems well-built :) Props to all contributors who worked on this! 👍
I'm playing around with the new
wp-each
directive (just released in Gutenberg 17.6) to render a list of filtered objects (CPTs) completely on the client side and also handle filtering and re-rendering on the client side.I've previously built things like that with AlpineJS, so it may very well be, that I'm still using the interactivity API wrong or am using the wrong directives.
I've got some questions, ideas and problems and thought I'd collect them here in this thread, but if this is not the right place or separate issues are better, just let me know. (Maybe there are already existing issues and I just couldn't find them).
Evaluating the contents of attributes directly
AlpineJS has the handy possibility to directly evaluate the contents of attributes, without having to use a callback function on the store.
For example:
<span data-wp-class--is-active="context.currentFilter = context.filter.id" data-wp-text="context.filter.name"></span>
instead of having to use
<span data-wp-class--is-active="callbacks.isCurrentFilter" data-filter="context.filter.id" data-wp-text="context.filter.name"></span>
(This runs in a data-wp-each where context.filter is an item in a context.filters list)
I don't know how Alpine JS does it and if they are using
eval
for that and how that could be a security problem. I guess developers need to be aware, that any user values in the attribute definitely should be escaped.This is also handy to call helper functions. For example, formatting a date in wp-text. I guess this could be done via a computed/derived value (via a getter). But since the value is from an object in an array (which is part of the wp-each list), I think a getter on the store would be kind of "misplaced".
Most of the examples just use boolean values (toggle, isToggled, etc.), but do not compare any values.
Passing arguments to callbacks
Following the example above, to conditionally add the
is-active
class on elements, I need to use a callback. But as far as I can see, there's no way to pass arguments to a callback being called for a directive. The only argument passed to the callback is an event. I can use the event's target orgetElement
and then get the elements data-attribute to check. But this is kind of cumbersome:Or is there an existing better way?
getElement ref is null on init
In the above example, when setting the
currentFilter
value indata-wp-context
on the server side,ref
is null on the first runs ofisCurrentFilter
for all objects. So I can't use the data-attribute value. If I return false here, the isCurrentFilter is not evaluated again, only when a context value changes. I guess this is, because the first run runs before the element is rendered?Hide/show elements (x-if/x-show attributes).
The examples use the
hidden
attribute to conditionally hide elements (e.g.:data-wp-bind--hidden="callback.isHidden"
)Alpine JS has a handy
x-show
attribute, to only render an element if the attribute evaluates to true. It just (visually) hides the element, like the hidden property.x-if
can be used on template-tags to conditionally render the element.It would be great to have something like that in the Interactivity API.
An example:
At the moment, I have to do:
Which is kind of confusing to read (because of the inverse negations) and I also have to use callbacks (see first idea above). I like to use the hidden attribute (or x-show), because it also semantically transports that the element is hidden / not relevant etc. - just applying a CSS class (e.g.
data-wp-class--is-hidden
could be a workaround, but not perfect IMHO).I know this may all be hard to understand without context, so I uploaded a simplified version of my template in a gist (this is kind of pseudocode because I simplified it, so not sure if you can copy-paste that and it would work 😅):
https://gist.github.com/gaambo/d9803da55d03a5f9bea3875f9eaa3acc
As mentioned above, I'd like this thread to serve as a discussion for ideas how those things could be done or which new directives could help make it easier. All of this are things that are especially useful when client side rendering (e.g. inside a wp-each), but also when setting values from the server side.
I'm happy for any hints, feedback and tips :)
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