Struggling with transferring a value between two input fields using jQuery

I'm currently working on a project to create a simple "to-do list" and I've encountered an issue that seems pretty basic. I am trying to pass the main input from #myInput at the top, down to the next line below, but I'm facing some challenges. When you enter something and click add, it initially creates a blank new line, then if you type something else and click add again, what was previously entered shows up on the next line. This continues for as long as you input different text, but if you repeatedly hit add with the same input, nothing shows up. Once you change the input to something different and click add, everything appears. It's quite frustrating that the current line output doesn't display properly. If anyone has suggestions on how to resolve this issue, they would be greatly appreciated. You can view exactly what is happening in the JSfiddle link provided below.

<div>
  <form id="addThings" type="text">
    <input type="text" id="myInput" placeholder="add to your to-do list" size="50" maxlength="40" autocomplete="off" autofocus>
    <input type="button" id="addButton" value="add">
  </form>
</div>

Furthermore, when you click the button to create a new line below, it shifts everything around a bit. Any suggestions on what changes need to be made in the CSS to make it smoother? I'm aiming for a more seamless interface. Thank you!

$(function() {
  var i = 2;
  $('#addButton').click(function(e) {
    var input = $('#myInput').val();
    console.log(input);
    var id = "newLine" + i;
    var line = '<input type=\"text\" id=\"' + id + '\" size=\"50\" disabled><input type=\"checkbox\" >';    
    $('form').append(line);
    var newId = "#" + id;
    $('#myInput').change(function() {
      $(newId).val(input);
    });
    i += 1;
  });
});

JSFiddle Link

Answer №1

Here's a helpful tip for you: When working with input fields, make sure to provide a value before appending it for better results. It seems like in your situation, there is an issue related to JavaScript closure. To resolve this, try defining the input variable outside of the click function.

$(function() {
  var i = 2;
  $('#addButton').click(function(e) {
    var input = $('#myInput').val();
    console.log(input);
    var id = "newLine" + i;
    var line = '<input type=\"text\" id=\"' + id + '\" value=\"'+input+'\" size=\"50\" disabled><input type=\"checkbox\" >';
    console.log(line);
    $('form').append(line);

    i += 1;
  });
});

JSFIDDLE

Answer №2

When creating a new line, make sure to assign the input value to the value attribute of your new input:

$(function() {
  var i = 2;
  $('#addButton').click(function(e) {
    var input = $('#myInput').val();
    var id = "newLine" + i;
    var line = '<input type=\"text\" id=\"' + id + '\" size=\"50\" value="' + input + '" disabled><input type=\"checkbox\">';
    $('form').append(line);
    var newId = "#" + id;
    /*$('#myInput').change(function() {
      $(newId).val(input);
    });*/
    i += 1;
  });
});
body {
  background-color: white;
}

div {
  width: 750px;
  margin: 0 auto;
  margin-top: 200px;
  margin-bottom: 0;
  padding: 0;
}

form {
  margin: 0 auto;
  display: inline-block;
  margin-bottom: 0px;
}

input {
  padding: 10px 18px;
  float: bottom;
}

input[type=text] {
  border-left: white;
  border-right: white;
  border-top: white;
  font-size: 20px;
  i height: 21px;
  text-align: center;
  outline: none;
  float: right;
  background-color: white;
}

input[type=button] {
  display: inline-block;
  height: 25px border: 0;
  margin: 0 auto;
  font-size: 20px;
  float: right;
}

input[type=checkbox] {
  vertical-align: top;
  width: 10%;
  margin: 15px auto;
  float: right;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<body>
  <div>
    <form id="addThings" type="text">
      <input type="text" id="myInput" placeholder="add to your to-do list" size="50" maxlength="40" autocomplete="off" autofocus>
      <input type="button" id="addButton" value="add">
    </form>
  </div>
</body>

Answer №3

There seems to be a closure/scope issue present in your code. The variable input is contained within the click function, making it inaccessible within the change function.

To resolve this issue, consider moving the declaration of input outside of the click function and create a wrapper function. This way, all necessary variables will be scoped within the addButtonScopeFunc.

It is important that these variables are not placed in the global scope or within the event function for #addButton.

$(function() {
  var addButtonScopeFunc = function (input, inputValChangeEl) {
      var i = 2,
          id = "newLine" + i,
          newId = "#" + id,
          line = '<input type=\"text\" id=\"' + id + '\" size=\"50\" disabled><input type=\"checkbox\" >';
      console.log(input);
      console.log(line);
      $('form').append(line);
      $(inputValChangeEl).change(function() {
          $(newId).val(input);
      });
      i += 1;
    };
    $('#addButton').click(function(e) {
        addButtonScopeFunc($('#myInput').val(), '#myInput'); 
    });
});        

For illustration purposes, consider restructuring the $(inputValChangeEl).change(...) event function outside of addButtonScopeFunc. Place it in its own wrapper function that accepts the input value as a parameter.

$(function() {
  var addButtonScopeFunc = function (input, inputValChangeEl) {
      /* ... */
      $('form').append(line);
      changeInputVal(inputValChangeEl, newId, input); 
      i += 1;
  },
  changeInputVal = function (el, id, input) {
      $(el).change(function() {
          $(id).val(input);
      });
  };
  $('#addButton').click(function(e) {
      addButtonScopeFunc($('#myInput').val(), '#myInput'); 
  });
});    

For more information on JavaScript scopes, you can refer to: Javascript Scopes well explained

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