ADD: default value for A record create (closes #228)

frontend/src/views/dnsvs/BCDRecords.vue

@@ -496,6 +496,9 @@ export default {
     reverseIfDesc(rec_type, arr) {
       return (this.sort_dir[rec_type] === 'ascending') ? arr : [...arr].reverse()
     },
+    reverseIfAsc(rec_type, arr) {
+      return (this.sort_dir[rec_type] === 'descending') ? arr : [...arr].reverse()
+    },
     upperIfAsc(rec_type) {
       return (this.sort_dir[rec_type] === 'ascending') ? this.asc_v4_blocklist_by_upper : this.asc_v4_blocklist_by_lower
     },
@@ -608,6 +611,20 @@ export default {
           this.db_editor_presets.data = sub.cidr.split('/')[0]
         }
       }
+      if (record_type === 'A') {
+        let res_ip = null
+        for (const bl of this.reverseIfAsc('A', this.asc_v4_blocklist)) {
+          for (const b of bl.containing_blocks) {
+            if (b.type === 'free') {
+              res_ip = b.first
+              break
+            }
+          }
+        }
+        if (res_ip !== null) {
+          this.db_editor_presets.data = res_ip
+        }
+      }
       this.create_record_reducer = {type: false}
       this.$root.$emit('bv::show::modal', 'create_record')
     },