added transaction log, UX scaffolding

ttfrog/assets/static/js/character_sheet.js

@@ -0,0 +1,31 @@
+function proficiency() {
+    return parseInt(document.getElementById('proficiency_bonus').innerHTML);
+}
+
+function bonus(stat) {
+    return parseInt(document.getElementById(stat + '_bonus').innerHTML);
+}
+
+function setStatBonus(stat) {
+    var score = document.getElementById(stat).value;
+    var bonus = Math.floor((score - 10) / 2);
+    document.getElementById(stat + '_bonus').innerHTML = bonus;
+}
+
+function setProficiencyBonus() {
+    var score = document.getElementById('level').value;
+    var bonus = Math.ceil(1 + (0.25 * score));
+    document.getElementById('proficiency_bonus').innerHTML = bonus;
+}
+
+function setSpellSaveDC() {
+    var score = 8 + proficiency() + bonus('wis');
+    document.getElementById('spell_save_dc').innerHTML = score;
+}
+
+(function () {
+    const stats = ['str', 'dex', 'con', 'int', 'wis', 'cha'];
+    stats.forEach(setStatBonus);
+    setProficiencyBonus();
+    setSpellSaveDC();
+})();