Core htmx Parameter Handling

• formdata works along web components4ms ‣

  // See https://web.dev/articles/more-capable-form-controls
  class TestElement extends HTMLElement {
    static formAssociated = true
    constructor() {
      super()
      this._form = null
    }
    formAssociatedCallback(form) {
      if (this._form) {
        this._form.removeEventListener('formdata', this.handleFormData)
      }
      this._form = form
      this._form.addEventListener('formdata', this.handleFormData)
    }
    handleFormData({
      formData
    }) {
      formData.append('foo', 'bar')
    }
  }
  customElements.define('test-element', TestElement)
  var form = make('<form hx-post="/test"><test-element></test-element></form>')
  var vals = htmx._('getInputValues')(form, 'get').values
  vals.foo.should.equal('bar')