Uncaught TypeError: Cannot read property 'length' of undefined. Javascript

Asked Mar 20 '21 at 18:06

Active Mar 20 '21 at 18:45

Viewed 21 times

Hello I was typing this code to display the table's info in txt boxes but I found a problem here: Uncaught TypeError: Cannot read property 'length' of undefined.

Id Name Email Country City 1 Aymen Zitouni Email Country City var tbl = document.getElementsByClassName("TableInfo"); document.write(tbl.rows.length); for (var x = 1 ; x

<form class="InfoForm" method="POST">
    <div>
        <label>ID</label> <input type="text" id="txtNumber">
        <br><br>
        <label>Name</label> <input type="text"  id="txtName">
        <br><br>
        <label>Email</label> <input type="email"  id="txtEmail">
        <br><br>
        <label>Country</label>  <select id="txtCountry"><option>Tunisia</option>
                                        <option>Germany</option>
                                        <option>Italy</option>
                                        <option>America</option>
                                </select>
        <br><br>
        <label>City</label> <input type="text"  id="txtCity">
        <br><br>
        <button>Show</button>
        <button>Insert</button>
        <button>Delete</button>
        <button>Update</button>
    </div>                        
</form>

edited Mar 20 '21 at 18:45

asked Mar 20 '21 at 18:06

Aymen

try to use `tbl.length` instead of `tbl.rows.length` – Mijanur Rahaman Mar 20 '21 at 18:13
no I have to type tbl.rows.length because the loop will read each row and get infos to show them in txtBoxes – Aymen Mar 20 '21 at 18:18
Also define `ids` for each column element. – SRJ Mar 20 '21 at 18:19
@Aymen haye you tried it ? just try it first – Mijanur Rahaman Mar 20 '21 at 18:20
@Aymen put an id to the table for better approach – Mijanur Rahaman Mar 20 '21 at 18:22
I put id but still the same – Aymen Mar 20 '21 at 18:25
when i type tbl. and i'm waiting the vs code to suggest me length it doesn't give me length suggest so I wrote with myself – Aymen Mar 20 '21 at 18:26
@Mijanur Rahaman i tried it bro there's no problem shown but it doesn't work – Aymen Mar 20 '21 at 18:35
@Aymen then share your complete codes, here your codes are incomplete – Mijanur Rahaman Mar 20 '21 at 18:38
@Mijanur Rahaman i put the completed code – Aymen Mar 20 '21 at 18:47
@Aymen its not showing all of your codes – Mijanur Rahaman Mar 21 '21 at 08:43
@Aymen your question is closed, you can see the pen here I have solved it https://codepen.io/imijanur/pen/xxRvQPJ?editors=1111 – Mijanur Rahaman Mar 21 '21 at 09:06
@Mijanur Rahaman thanks a lot – Aymen Mar 21 '21 at 10:16

Uncaught TypeError: Cannot read property 'length' of undefined. Javascript

0 Answers0