diff --git a/app/javascript/application.js b/app/javascript/application.js
index 230a5de..84d20ab 100644
--- a/app/javascript/application.js
+++ b/app/javascript/application.js
@@ -1,6 +1,7 @@
 // Configure your import map in config/importmap.rb. Read more:
 // https://github.com/rails/importmap-rails
 import "@hotwired/turbo-rails"
+import "./turbo_actions.js"
 // TODO: access `data-` attributes through
 // `keyname in`/`dataset.keyname`/`delete dataset.keyname`
 
@@ -77,111 +78,13 @@ function numberValidate(event) {
 window.numberValidate = numberValidate
 
 
-// Turbo stream actions.
-const FORM_CONTROLS = ["BUTTON", "FIELDSET", "INPUT", "OPTGROUP", "OPTION", "SELECT",
-                       "TEXTAREA"]
-Turbo.StreamElement.prototype.disableElement = function(element) {
-  if (FORM_CONTROLS.includes(element.tagName)) {
-    element.setAttribute("disabled", "disabled")
-  } else {
-    element.setAttribute("aria-disabled", "true")
-    // NOTE: tabindex should not be disabled?
-    element.setAttribute("tabindex", "-1")
-  }
-}
-Turbo.StreamActions.disable = function() {
-  this.targetElements.forEach((e) => { this.disableElement(e) })
-}
-
-Turbo.StreamElement.prototype.enableElement = function(element) {
-  if (FORM_CONTROLS.includes(element.tagName)) {
-    element.removeAttribute("disabled")
-  } else {
-    element.removeAttribute("aria-disabled")
-    // Assume 'tabindex' is not used explicitly, so removing it is safe.
-    element.removeAttribute("tabindex")
-  }
-}
-Turbo.StreamActions.enable = function() {
-  this.targetElements.forEach((e) => { this.enableElement(e) })
-}
-
-// TODO: change to visibility = collapse to avoid width change?
-Turbo.StreamActions.hide = function() {
-  this.targetElements.forEach((e) => { e.style.display = "none" })
-}
-
-Turbo.StreamActions.show = function() {
-  this.targetElements.forEach((e) => { e.style.removeProperty("display") })
-}
-
-/*
-Turbo.StreamActions.collapse = function() {
-  this.targetElements.forEach((e) => { e.style.visibility = "collapse" })
-}
-*/
-
-Turbo.StreamActions.close_form = function() {
-  this.targetElements.forEach((e) => {
-    // Move focus if there's no focus or focus inside form being closed.
-    const focused = document.activeElement
-    if (!focused || (focused == document.body) || e.contains(focused)) {
-      let nextForm = e.parentElement.querySelector(`#${e.id} ~ tr:has([autofocus])`)
-      nextForm ??= e.parentElement.querySelector("tr:has([autofocus])")
-      nextForm?.querySelector("[autofocus]").focus()
-    }
-    document.getElementById(e.getAttribute("data-form")).remove()
-    if (e.hasAttribute("data-link")) {
-      this.enableElement(document.getElementById(e.getAttribute("data-link")))
-    }
-    if (e.hasAttribute("data-hidden-row")) {
-      document.getElementById(e.getAttribute("data-hidden-row")).removeAttribute("style")
-    }
-    e.remove()
-  })
-}
-
-Turbo.StreamActions.unselect = function() {
-  this.targetElements.forEach((e) => {
-    e.checked = false
-    this.enableElement(e)
-  })
-}
-
-Turbo.StreamActions.validate = function() {
-  this.targetElements.forEach((form) => {
-    this.templateContent.querySelectorAll("span").forEach((span) => {
-      var control = document.querySelector(
-        `[form="${form.id}"][name="${span.dataset.name}"]`
-      )
-      control.setCustomValidity(span.textContent)
-      // Add event listener in capture phase to clear custom validity before
-      // `[oninput]` or any other bubble phase handler is invoked.
-      //   https://www.quirksmode.org/js/events_order.html
-      // TODO: keep invalidating current value whenever user re-enters it. Store
-      // invalid value and validation message in `[data-invalid-message/value]`
-      // and check input value on "input" event (below) (using `[pattern]` may not
-      // be suitable due to inability to customize validtion message; also
-      // pattern may be used for other, conflicting purposes).
-      // After user executes any other action (while form is open), remove `[data-]`
-      // attributes and custom validation, as value may no longer be invalid.
-      control.addEventListener(
-        "input",
-        function(event) { event.target.setCustomValidity("") },
-        {capture: true, once: true}
-      )
-    })
-    form.reportValidity()
-  })
-}
-
-
 // Keyboard event processing handlers.
 function formProcessKey(event) {
   switch (event.key) {
     case "Escape":
       event.currentTarget.querySelector("a[name=cancel]").click()
       break
+    // TODO: allow new line inside <textarea> (submit with ctrl-enter?)
     case "Enter":
       event.currentTarget.querySelector("button[name=button]").click()
       event.preventDefault()
diff --git a/app/javascript/turbo_actions.js b/app/javascript/turbo_actions.js
new file mode 100644
index 0000000..b5fb3f8
--- /dev/null
+++ b/app/javascript/turbo_actions.js
@@ -0,0 +1,97 @@
+// Turbo Streams actions.
+
+const FORM_CONTROLS = ["BUTTON", "FIELDSET", "INPUT", "OPTGROUP", "OPTION", "SELECT",
+                       "TEXTAREA"]
+
+Object.assign(Turbo.StreamElement.prototype, {
+  disableElement(element) {
+    if (FORM_CONTROLS.includes(element.tagName)) {
+      element.setAttribute("disabled", "disabled")
+    } else {
+      element.setAttribute("aria-disabled", "true")
+      // NOTE: tabindex should not be disabled?
+      element.setAttribute("tabindex", "-1")
+    }
+  },
+
+  enableElement(element) {
+    if (FORM_CONTROLS.includes(element.tagName)) {
+      element.removeAttribute("disabled")
+    } else {
+      element.removeAttribute("aria-disabled")
+      // Assume 'tabindex' is not used explicitly, so removing it is safe.
+      element.removeAttribute("tabindex")
+    }
+  },
+
+  showElement(element) { element.style.visibility = "visible" }
+})
+
+Object.assign(Turbo.StreamActions, {
+  disable() {
+    this.targetElements.forEach((e) => { this.disableElement(e) })
+  },
+
+  enable() {
+    this.targetElements.forEach((e) => { this.enableElement(e) })
+  },
+
+  hide() {
+    this.targetElements.forEach((e) => { e.style.visibility = "collapse" })
+  },
+
+  show() {
+    this.targetElements.forEach((e) => { this.showElement(e) })
+  },
+
+  unselect() {
+    this.targetElements.forEach((e) => { e.checked = false; this.enableElement(e) })
+  },
+
+  validate_form() {
+    this.targetElements.forEach((form) => {
+      this.templateContent.querySelectorAll("span").forEach((span) => {
+        var control = document.querySelector(
+          `[form="${form.id}"][name="${span.dataset.name}"]`
+        )
+        control.setCustomValidity(span.textContent)
+        // Add event listener in capture phase to clear custom validity before
+        // `[oninput]` or any other bubble phase handler is invoked.
+        //   https://www.quirksmode.org/js/events_order.html
+        // TODO: keep invalidating current value whenever user re-enters it. Store
+        // invalid value and validation message in `[data-invalid-message/value]`
+        // and check input value on "input" event (below) (using `[pattern]` may not
+        // be suitable due to inability to customize validtion message; also
+        // pattern may be used for other, conflicting purposes).
+        // After user executes any other action (while form is open), remove `[data-]`
+        // attributes and custom validation, as value may no longer be invalid.
+        control.addEventListener(
+          "input",
+          function(event) { event.target.setCustomValidity("") },
+          {capture: true, once: true}
+        )
+      })
+      form.reportValidity()
+    })
+  },
+
+  close_form() {
+    this.targetElements.forEach((e) => {
+      // Move focus if there's no focus or focus inside form being closed.
+      const focused = document.activeElement
+      if (!focused || (focused == document.body) || e.contains(focused)) {
+        let nextForm = e.parentElement.querySelector(`#${e.id} ~ tr:has([autofocus])`)
+        nextForm ??= e.parentElement.querySelector("tr:has([autofocus])")
+        nextForm?.querySelector("[autofocus]").focus()
+      }
+      document.getElementById(e.dataset.form).remove()
+      if ('link' in e.dataset) {
+        this.enableElement(document.getElementById(e.dataset.link))
+      }
+      if ('hiddenRow' in e.dataset) {
+        this.showElement(document.getElementById(e.dataset.hiddenRow))
+      }
+      e.remove()
+    })
+  }
+})
diff --git a/app/views/application/errors.turbo_stream.erb b/app/views/application/errors.turbo_stream.erb
index e955533..4a73459 100644
--- a/app/views/application/errors.turbo_stream.erb
+++ b/app/views/application/errors.turbo_stream.erb
@@ -1,4 +1,4 @@
-<%= turbo_stream.validate dom_target(*@target, :form) do %>
+<%= turbo_stream.validate_form dom_target(*@target, :form) do %>
   <% @record.errors.attribute_names.map do |attr| %>
     <%= tag.span data: {name: field_name(dom_class(@record), attr)} do %>
       <%- @record.errors.full_messages_for(attr).map { |m| m + '.' }.join(' ') %>
diff --git a/config/initializers/turbo_streams_tag_builder.rb b/config/initializers/turbo_streams_tag_builder.rb
index b104a62..5e0fe20 100644
--- a/config/initializers/turbo_streams_tag_builder.rb
+++ b/config/initializers/turbo_streams_tag_builder.rb
@@ -23,19 +23,15 @@ ActiveSupport.on_load :turbo_streams_tag_builder do
     action :show, target, allow_inferred_rendering: false
   end
 
-  #def collapse(target)
-  #  action :collapse, target, allow_inferred_rendering: false
-  #end
-
-  def close_form(target)
-    action :close_form, target, allow_inferred_rendering: false
-  end
-
   def unselect(target)
     action :unselect, target, allow_inferred_rendering: false
   end
 
-  def validate(target, content = nil, **rendering, &block)
-    action :validate, target, content, **rendering, &block
+  def validate_form(target, content = nil, **rendering, &block)
+    action :validate_form, target, content, **rendering, &block
+  end
+
+  def close_form(target)
+    action :close_form, target, allow_inferred_rendering: false
   end
 end