1 files changed, 61 insertions, 0 deletions
diff --git a/actionview/app/assets/javascripts/utils/form.coffee b/actionview/app/assets/javascripts/utils/form.coffee
new file mode 100644
index 0000000000..251113deda
--- /dev/null
+++ b/actionview/app/assets/javascripts/utils/form.coffee
@@ -0,0 +1,61 @@
+#= require ./dom
+
+{ matches } = Rails
+
+toArray = (e) -> Array.prototype.slice.call(e)
+
+Rails.serializeElement = (element, additionalParam) ->
+  inputs = [element]
+  inputs = toArray(element.elements) if matches(element, 'form')
+  params = []
+
+  inputs.forEach (input) ->
+    return unless input.name
+    if matches(input, 'select')
+      toArray(input.options).forEach (option) ->
+        params.push(name: input.name, value: option.value) if option.selected
+    else if input.type isnt 'radio' and input.type isnt 'checkbox' or input.checked
+      params.push(name: input.name, value: input.value)
+
+  params.push(additionalParam) if additionalParam
+
+  params.map (param) ->
+    if param.name?
+      "#{encodeURIComponent(param.name)}=#{encodeURIComponent(param.value)}"
+    else
+      param
+  .join('&')
+
+# Helper function that returns form elements that match the specified CSS selector
+# If form is actually a "form" element this will return associated elements outside the from that have
+# the html form attribute set
+Rails.formElements = (form, selector) ->
+  if matches(form, 'form')
+    toArray(form.elements).filter (el) -> matches(el, selector)
+  else
+    toArray(form.querySelectorAll(selector))
+
+# Helper function which checks for blank inputs in a form that match the specified CSS selector
+Rails.blankInputs = (form, selector, nonBlank) ->
+  foundInputs = []
+  requiredInputs = toArray(form.querySelectorAll(selector or 'input, textarea'))
+  checkedRadioButtonNames = {}
+
+  requiredInputs.forEach (input) ->
+    if input.type is 'radio'
+      # Don't count unchecked required radio as blank if other radio with same name is checked,
+      # regardless of whether same-name radio input has required attribute or not. The spec
+      # states https://www.w3.org/TR/html5/forms.html#the-required-attribute
+      radioName = input.name
+      # Skip if we've already seen the radio with this name.
+      unless checkedRadioButtonNames[radioName]
+        # If none checked
+        if form.querySelectorAll("input[type=radio][name='#{radioName}']:checked").length == 0
+          radios = form.querySelectorAll("input[type=radio][name='#{radioName}']")
+          foundInputs = foundInputs.concat(toArray(radios))
+        # We only need to check each name once.
+        checkedRadioButtonNames[radioName] = radioName
+    else
+      valueToCheck = if input.type is 'checkbox' then input.checked else !!input.value
+      foundInputs.push(input) if valueToCheck is nonBlank
+  foundInputs