From 11c5cd36534729c2d03d975be6c7d06a001f3208 Mon Sep 17 00:00:00 2001
From: Felix Hamann <felix.hamann@campus.lmu.de>
Date: Tue, 23 Apr 2019 13:40:03 +0200
Subject: [PATCH] add massInput js util

---
 src/Foundation.hs                            |   1 +
 static/js/utils/massInput.js                 | 127 +++++++++++++++++++
 templates/widgets/massinput/massinput.hamlet |   2 +-
 3 files changed, 129 insertions(+), 1 deletion(-)
 create mode 100644 static/js/utils/massInput.js

diff --git a/src/Foundation.hs b/src/Foundation.hs
index 46e176a19..a05a45558 100644
--- a/src/Foundation.hs
+++ b/src/Foundation.hs
@@ -1175,6 +1175,7 @@ siteLayout' headingOverride widget = do
       addScript $ StaticR js_utils_checkAll_js
       addScript $ StaticR js_utils_form_js
       addScript $ StaticR js_utils_inputs_js
+      addScript $ StaticR js_utils_massInput_js
       addScript $ StaticR js_utils_modal_js
       addScript $ StaticR js_utils_showHide_js
       -- addScript $ StaticR js_utils_tabber_js
diff --git a/static/js/utils/massInput.js b/static/js/utils/massInput.js
new file mode 100644
index 000000000..7b58bb625
--- /dev/null
+++ b/static/js/utils/massInput.js
@@ -0,0 +1,127 @@
+(function() {
+  'use strict';
+
+  /**
+   *
+   * Mass Input Utility
+   *  allows form shapes to be manipulated asynchronously:
+   *  will asynchronously submit the form and replace the contents of the
+   *  mass input with the one from the BE response
+   *
+   * Attribute:   uw-mass-input
+   *   (will be set up automatically on tables)
+   *
+   * Example usage:
+   *  (table with one column thats only checkboxes)
+   */
+
+  var MASS_INPUT_UTIL_NAME = 'massInput';
+  var MASS_INPUT_UTIL_SELECTOR = '[uw-mass-input]';
+
+  var MASS_INPUT_INITIALIZED_CLASS = 'mass-input--initialized';
+
+  var massInputUtil = function(element) {
+    var massInputId;
+    var massInputFormSubmitHandler;
+    var massInputForm;
+
+    function init() {
+      if (!element) {
+        throw new Error('Mass Input utility cannot be setup without an element!');
+      }
+
+      massInputId = element.id;
+      massInputForm = element.closest('form');
+
+      if (!massInputForm) {
+        throw new Error('Mass Input utility cannot be setup without being wrapped in a <form>!');
+      }
+
+      massInputFormSubmitHandler = makeSubmitHandler(massInputForm);
+      massInputForm.addEventListener('submit', massInputFormSubmitHandler);
+
+      // mark initialized
+      element.classList.add(MASS_INPUT_INITIALIZED_CLASS);
+
+      return {
+        name: MASS_INPUT_UTIL_NAME,
+        element: element,
+        destroy: function() {},
+      };
+    }
+
+    function makeSubmitHandler(massInputForm) {
+      if (!HttpClient) {
+        throw new Error('HttpClient not found!');
+      }
+
+      var method = massInputForm.getAttribute('method') || 'POST';
+      var url = massInputForm.getAttribute('action') || window.location.href;
+      var enctype = massInputForm.getAttribute('enctype') || 'application/json';
+
+      var requestFn;
+      if (HttpClient[method.toLowerCase()]) {
+        requestFn = HttpClient[method.toLowerCase()];
+      }
+
+      return function(event) {
+        event.preventDefault();
+        var formData = new FormData(massInputForm);
+
+        var formBody = [];
+
+        for(var formField of formData) {
+          var encodedKey = encodeURIComponent(formField[0]);
+          var encodedValue = encodeURIComponent(formField[1]);
+          formBody.push(encodedKey + "=" + encodedValue);
+        }
+        var requestBody = formBody.join("&");
+
+        if (requestFn) {
+          requestFn(
+            url,
+            {
+              'Content-Type': enctype,
+              'Mass-Input-Shortcircuit': massInputId,
+              'Upgrade-Insecure-Requests': 1,
+            },
+            requestBody,
+          ).then(function(response) {
+            return response.text()
+          }).then(function(response) {
+            processResponse(response);
+          });
+        }
+      };
+    }
+
+    function processResponse(response) {
+      var responseElement = document.createElement('div');
+      responseElement.innerHTML = response;
+      var newWrapperContents = responseElement.querySelector('#' + massInputId);
+      element.innerHTML = newWrapperContents.innerHTML;
+
+      reset()
+
+      if (UtilRegistry) {
+        UtilRegistry.setupAll(element);
+      }
+    }
+
+    function reset() {
+      element.classList.remove(MASS_INPUT_INITIALIZED_CLASS);
+      massInputForm.removeEventListener('submit', massInputFormSubmitHandler)
+    }
+
+    return init();
+  };
+
+  // register mass input util
+  if (UtilRegistry) {
+    UtilRegistry.register({
+      name: MASS_INPUT_UTIL_NAME,
+      selector: MASS_INPUT_UTIL_SELECTOR,
+      setup: massInputUtil
+    });
+  }
+})();
diff --git a/templates/widgets/massinput/massinput.hamlet b/templates/widgets/massinput/massinput.hamlet
index 3dde7384d..9a8ef2534 100644
--- a/templates/widgets/massinput/massinput.hamlet
+++ b/templates/widgets/massinput/massinput.hamlet
@@ -1,5 +1,5 @@
 $newline never
-<div .massinput ##{fvId}>
+<div .massinput uw-mass-input ##{fvId}>
   #{csrf}
   ^{shapeInput}
   ^{miWidget}