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JavaScript JavaScript Loops, Arrays and Objects Tracking Data Using Objects Mixing and Matching Arrays and Objects

Whats wrong with my code

Hi I try to put in practice the learned in the video. I try the next code in the browser

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> </head> <body> <form action="" method="POST"> <label for="nombre">Escriba un Nombre</label> <input type="text" id="nombre" /> <label for="apellidos">Escriba sus apellidos</label> <input type="text" id="apellidos" /> <label for="edad">Escriba su edad</label> <input type="text" id="edad" /> <button type="submit" id="agregar">Enviar</button> </form> <table border="1" id="tabla"> <tr> <td>Nombre</td> <td>Apellidos</td> <td>Edad</td> </tr> </table> <script> let personas= new Array(); let agregar=document.getElementById("agregar"); agregar.addEventListener("click",function(e){ e.preventDefault(); let nombre=document.getElementById("nombre").value; let apellidos=document.getElementById("apellidos").value; let edad=document.getElementById("edad").value; let persona={"nombre":nombre,"apellidos":apellidos,"edad":edad}; personas.push(persona); //crear las filas necesarias por cada registro for(let i=0;i<personas.length;i++){ var tr=document.createElement("tr"); //Lllenar cada fila con los registros de cada elemento del arreglo for (var key in i) { let td=document.createElement("td"); let txt =document.createTextNode(i[key]); td.appendChild(txt); tr.appendChild(td); } } let tblBody= document.getElementsByTagName("tbody")[0].appendChild(tr); document.getElementById("tabla").appendChild(tblBody); }); </script> </body> </html>

The main idea is fill the fields in the form and then add in a table. But the issue its thats the cells dont create in the view

2 Answers

Steven Parker
Steven Parker
229,005 Points

It's hard to read the unformatted code, but I managed to spot a couple of issues:

  • the array index was being used directly instead of the item at the index
  • the table row was being moved behind the table body

Here are the relevant code lines, with corrections:

//      for (var key in i) {                                    <- "i" is just a number
        for (var key in personas[i]) {                          // use object instead
//-----
//        let txt = document.createTextNode(i[key]);            <- same problem
          let txt = document.createTextNode(personas[i][key]);  // use object instead
//-----
//      this assignment is not needed:
//      let tblBody = document.getElementsByTagName("tbody")[0].appendChild(tr);
        document.getElementsByTagName("tbody")[0].appendChild(tr);
//-----
//      don't move the row after body
//      document.getElementById("tabla").appendChild(tblBody);

Nice, work like a charm! Thank you so much. I learned a lot :)