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Editorial Team
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Asked: 2026-05-23T07:57:04+00:00

I’m learning jQuery and was following a tutorial, a very strange error has perplexed

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I’m learning jQuery and was following a tutorial, a very strange error has perplexed me.
Here’s my html : 

<!doctype html>
<html>
  <head>
    <title> Simple Task List </title>
    <script src="jquery.js"></script>
    <script src="task-list.js"></script>
  </head>

  <body>
    <ul id="tasks">

    </ul>
      <input type="text" id="task-text" />
      <input type="submit" id="add-task" />
  </body>
</html>

and The jQuery :

$(document).ready(function(){
    //To add a task when the user hits the return key
    $('#task-text').keydown(function(evt){
      if(evt.keyCode == 13)
      {
        add_task(this, evt);
      }
      });
    //To add a task when the user clicks on the submit button
      $("#add-task").click(function(evt){
        add_task(document.getElementByID("task-text"),evt);
        });
    });

function add_task(textBox, evt){
  evt.preventDefault();
  var taskText = textBox.value;
  $("<li>").text(taskText).appendTo("#tasks");
  textBox.value = "";
};

When I add elements By hitting the return key, there’s no problem.
But When I click the Submit Button then firebug shows this error

document.getElementByID is not a function
[Break On This Error] add_task(document.getElementByID("task-text"),evt);
task-list.js (line 11)

I tried to use jQuery instead replacing it with 

$("#task-text")

This time the error is :

$("<li>").text(taskText).appendTo is not a function
[Break On This Error] $("<li>").text(taskText).appendTo("#tasks");
task-list.js (line 18
which results in the following error

I’ve been trying to debug this for some time but i just don’t get it. Its probably a really silly mistake that i’ve made. Any help is most appreciated.

Edit :
I’m using jQuery 1.6.1

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1 Answer

  1. Editorial Team

    It’s document.getElementById() and not document.getElementByID(). Check the casing for Id.

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