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53 lines
2.5 KiB
Markdown
53 lines
2.5 KiB
Markdown
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title = "hx-include"
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+++
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The `hx-include` attribute allows you to include additional element values in an AJAX request. The value of this
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attribute can be:
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* A CSS query selector of the elements to include.
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* `this` which will include the descendants of the element.
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* `closest <CSS selector>` which will find the [closest](https://developer.mozilla.org/docs/Web/API/Element/closest)
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ancestor element or itself, that matches the given CSS selector
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(e.g. `closest tr` will target the closest table row to the element).
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* `find <CSS selector>` which will find the first child descendant element that matches the given CSS selector.
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* `next <CSS selector>` which will scan the DOM forward for the first element that matches the given CSS selector.
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(e.g. `next .error` will target the closest following sibling element with `error` class)
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* `previous <CSS selector>` which will scan the DOM backwards for the first element that matches the given CSS selector.
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(e.g `previous .error` will target the closest previous sibling with `error` class)
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Here is an example that includes a separate input value:
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```html
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<div>
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<button hx-post="/register" hx-include="[name='email']">
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Register!
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</button>
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Enter email: <input name="email" type="email"/>
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</div>
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```
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This is a little contrived as you would typically enclose both of these elements in a `form` and submit
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the value automatically, but it demonstrates the concept.
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Note that if you include a non-input element, all input elements enclosed in that element will be included.
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## Notes
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* `hx-include` is inherited and can be placed on a parent element
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* While `hx-include` is inherited, it is evaluated from the element triggering the request. It is easy to get confused
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when working with the extended selectors such as `find` and `closest`.
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```html
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<div hx-include="find input">
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<button hx-post="/register">
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Register!
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</button>
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Enter email: <input name="email" type="email"/>
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</div>
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```
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In the above example, when clicking on the button, the `find input` selector is resolved from the button itself, which
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does not return any element here, since the button doesn't have any `input` child, thus in this case, raises an error.
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* A standard CSS selector resolves
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to [document.querySelectorAll](https://developer.mozilla.org/docs/Web/API/Document/querySelectorAll) and will include
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multiple elements, while the extended selectors such as `find` or `next` only return a single element at most to
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include |