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htmx/www/attributes/hx-vals.md

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layout.njk </> htmx - hx-vals

hx-vals

The hx-vals attribute allows you to add to the parameters that will be submitted with an AJAX request.

By default, the value of this attribute is a list of name-expression values in JSON (JavaScript Object Notation) format.

If you wish for hx-vals to evaluate the values given, you can prefix the values with javascript: or js:.

  <div hx-get="/example" hx-vals='{"myVal": "My Value"}'>Get Some HTML, Including A Value in the Request</div>

  <div hx-get="/example" hx-vals='js:{myVal: calculateValue()}'>Get Some HTML, Including a Dynamic Value from Javascript in the Request</div>

Security Considerations

  • By default, the value of hx-vals must be valid JSON. It is not dynamically computed. If you use the javascript: prefix, be aware that you are introducing security considerations, especially when dealing with user input such as query strings or user-generated content, which could introduce a Cross-Site Scripting (XSS) vulnerability.

Notes

  • hx-vals is inherited and can be placed on a parent element.
  • A child declaration of a variable overrides a parent declaration.
  • Input values with the same name will be overridden by variable declarations.