From 6faa859d7dc69ee873bda8e5e695ce4332462435 Mon Sep 17 00:00:00 2001
From: Étienne Loks <etienne.loks@iggdrasil.net>
Date: Mon, 16 Sep 2019 19:03:52 +0200
Subject: Forms: manage conditionnal field inside a same form with JS

---
 ishtar_common/forms.py | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)

(limited to 'ishtar_common/forms.py')

diff --git a/ishtar_common/forms.py b/ishtar_common/forms.py
index 24972ed3b..c9c88b805 100644
--- a/ishtar_common/forms.py
+++ b/ishtar_common/forms.py
@@ -617,6 +617,7 @@ class FormHeader(object):
 
 class IshtarForm(forms.Form, BSForm):
     TYPES = []  # FieldType list
+    CONDITIONAL_FIELDS = []  # dynamic conditions on field display
     PROFILE_FILTER = {}  # profile key associated to field list
     HEADERS = {}  # field key associated to FormHeader instance
     SITE_KEYS = {}  # archaeological sites fields and associated translation key
@@ -659,6 +660,72 @@ class IshtarForm(forms.Form, BSForm):
         self.current_header = self.HEADERS[key]
         return self.current_header
 
+    def extra_render(self):
+        return self.get_conditional()
+
+    HIDE_JS_TEMPLATE = """
+    var %(id)s_item_show_list = ['%(item_list)s'];
+    for (idx in %(id)s_item_show_list){
+        $("#main_div-id_" + %(id)s_item_show_list[idx]).addClass("d-none");
+    }
+    """
+    CONDITIONAL_JS_TEMPLATE = """
+    var %(id)s_check_list = ['%(check_id_list)s'];
+    var %(id)s_item_show_list = ['%(item_list)s'];
+    var %(id)s_hide_display = function(){
+        var current_val = $("#id_%(name)s").val();
+        console.log("#id_%(name)s");
+        if (%(id)s_check_list.indexOf(current_val) != -1){
+            for (idx in %(id)s_item_show_list){
+                $("#main_div-id_" + %(id)s_item_show_list[idx]).removeClass("d-none");
+            }
+        } else {
+            for (idx in %(id)s_item_show_list){
+                $("#main_div-id_" + %(id)s_item_show_list[idx]).addClass("d-none");
+            }
+        }
+    };
+    
+    $("#id_%(name)s").change(%(id)s_hide_display);
+    setTimeout(function(){
+        %(id)s_hide_display();
+    }, 500);
+    """
+
+    def get_conditional(self):
+        if not self.CONDITIONAL_FIELDS or not self.TYPES:
+            return
+
+        type_dict = dict([(typ.key, typ.model) for typ in self.TYPES])
+        html = ""
+        for condition, target_names in self.CONDITIONAL_FIELDS:
+            condition_field, condition_attr, condition_val = condition
+            if condition_field not in type_dict:
+                continue
+            model = type_dict[condition_field]
+            condition_ids = [
+                str(item.pk) for item in model.objects.filter(
+                    **{condition_attr: condition_val}).all()
+            ]
+            name = self.prefix + "-" + condition_field
+            target_names = [
+                self.prefix + "-" + name for name in target_names
+            ]
+            if not condition_ids:
+                html += self.HIDE_JS_TEMPLATE  % {
+                    "item_list": "','".join(target_names),
+                    "id": name.replace("-", "_")}
+                continue
+            html += self.CONDITIONAL_JS_TEMPLATE % {
+                "id": name.replace("-", "_"),
+                "name": name,
+                "item_list": "','".join(target_names),
+                "check_id_list": "','".join(condition_ids),
+            }
+        if html:
+            html = "<script type='text/javascript'>" + html + "</script>"
+        return html
+
 
 class TableSelect(IshtarForm):
     def __init__(self, *args, **kwargs):
-- 
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