filters done

labs/lab1/JavaScript/table.js

@@ -1,19 +1,26 @@
 const createTable = (data, idTable) => {
     const table = document.getElementById(idTable);
+    if (data.length == 0) {
+        return;
+    }
     const header = Object.keys(data[0]);
-   
+
     /* создание шапки таблицы */
-    const headerRow = createHeaderRow(header);
-    table.append(headerRow);
-	
+    if (!table.firstElementChild) {
+        const headerRow = createHeaderRow(header);
+        table.append(headerRow);
+    }
+
     /* создание тела таблицы */
-	const bodyRows = createBodyRows(data);
+    const bodyRows = createBodyRows(data);
     table.append(bodyRows);
 };
 
 const clearTable = (idTable) => {
     const table = document.getElementById(idTable);
-    table.removeChild(table.children[1]);
+    if (table.children.length > 1) {
+        table.removeChild(table.children[1]);
+    }
 }
 
 const createHeaderRow = (headers) => {
@@ -26,9 +33,9 @@ const createHeaderRow = (headers) => {
     return tr;
 };
 
-const createBodyRows = (rows) =>{
+const createBodyRows = (rows) => {
     const body = document.createElement('tbody');
-    rows.forEach(row =>{
+    rows.forEach(row => {
         const rowElement = document.createElement('tr');
         for (let key in row) {
             const td = document.createElement('td');