feat: Purchase "Create account" & "Sign in" flows and Floating label input (#672)

app/assets/javascripts/components/FloatingLabelInput.tsx

@@ -0,0 +1,75 @@
+import { FunctionComponent, Ref } from 'preact';
+import { JSXInternal } from 'preact/src/jsx';
+import { forwardRef } from 'preact/compat';
+import { useState } from 'preact/hooks';
+
+type Props = {
+  id: string;
+  type: 'text' | 'email' | 'password'; // Have no use cases for other types so far
+  label: string;
+  value: string;
+  onChange: JSXInternal.GenericEventHandler<HTMLInputElement>;
+  disabled?: boolean;
+  className?: string;
+  labelClassName?: string;
+  inputClassName?: string;
+  isInvalid?: boolean;
+};
+
+export const FloatingLabelInput: FunctionComponent<Props> = forwardRef(
+  (
+    {
+      id,
+      type,
+      label,
+      disabled,
+      value,
+      isInvalid,
+      onChange,
+      className = '',
+      labelClassName = '',
+      inputClassName = '',
+    },
+    ref: Ref<HTMLInputElement>
+  ) => {
+    const [focused, setFocused] = useState(false);
+
+    const BASE_CLASSNAME = `relative bg-default`;
+
+    const LABEL_CLASSNAME = `hidden absolute ${
+      !focused ? 'color-neutral' : 'color-info'
+    } ${focused || value ? 'flex top-0 left-2 pt-1.5 px-1' : ''} ${
+      isInvalid ? 'color-dark-red' : ''
+    } ${labelClassName}`;
+
+    const INPUT_CLASSNAME = `w-full h-full ${
+      focused || value ? 'pt-6 pb-2' : 'py-2.5'
+    } px-3 text-input border-1 border-solid border-gray-300 rounded placeholder-medium text-input focus:ring-info ${
+      isInvalid ? 'border-dark-red placeholder-dark-red' : ''
+    } ${inputClassName}`;
+
+    const handleFocus = () => setFocused(true);
+
+    const handleBlur = () => setFocused(false);
+
+    return (
+      <div className={`${BASE_CLASSNAME} ${className}`}>
+        <label htmlFor={id} className={LABEL_CLASSNAME}>
+          {label}
+        </label>
+        <input
+          id={id}
+          className={INPUT_CLASSNAME}
+          placeholder={!focused ? label : ''}
+          type={type}
+          value={value}
+          onChange={onChange}
+          onFocus={handleFocus}
+          onBlur={handleBlur}
+          ref={ref}
+          disabled={disabled}
+        />
+      </div>
+    );
+  }
+);