Trouble with the JQuery event listener onchange()

Question

Trouble with the JQuery event listener onchange()

On my webpage, I've set up a drop-down list and a text-box in the following HTML code:

<table>
                        <tr>
                            <td>Group Name: </td>
                            <td><%= Html.DropDownListFor(m => m.IndicationCalculatorGroupId, DropDownData.IndicationsGroup(SessionManager.Company.EntityID, ICConstants.IndicationsCalculatorGroupType), "", new { propertyName = "IndicationCalculatorGroupId", onchange = "UpdateField(this, false);GroupNameChange();" })%></td>
                        </tr>
                        <tr id="newGroupNameRow">
                            <td>New Group Name: </td>
                            <td><%= Html.TextBoxFor(m => m.IndicationCalculatorNewGroupName, new { @class = "economicTextBox", propertyName = "IndicationCalculatorNewGroupName", onchange = "UpdateField(this);" })%></td>
                        </tr>
                    </table>

I'm using JQuery to control the visibility of the text-box based on the selection made in the drop-down:

function GroupNameChange()
        {
            $("#IndicationCalculatorGroupId").change(function() {
                if ($("#IndicationCalculatorGroupId option:selected").text() == 'Create a New Group')
                {
                    $("#newGroupNameRow").show();
                }
                else{
                    $("#IndicationCalculatorNewGroupName").val('');
                    $("#newGroupNameRow").hide();
                }
            });
        }

However, there seems to be an issue where selecting "Create a New Group" for the first time doesn't display or trigger any action in the text-box. It only works after selecting a different option and then going back to "Create a New Group". What's causing this misfiring?

jquery html html-helper

Answer 1

Answer №1

Try incorporating your code into the page load event:


$(document).ready(function() {
  $("#IndicationCalculatorGroupId").change(function() {
    if ($("#IndicationCalculatorGroupId option:selected").text() == 'Create a New Group') {
      $("#newGroupNameRow").show();
    } else {
      $("#IndicationCalculatorNewGroupName").val('');
      $("#newGroupNameRow").hide();
    }
  });
});

Answer 2

Try incorporating your code into the page load event:


$(document).ready(function() {
  $("#IndicationCalculatorGroupId").change(function() {
    if ($("#IndicationCalculatorGroupId option:selected").text() == 'Create a New Group') {
      $("#newGroupNameRow").show();
    } else {
      $("#IndicationCalculatorNewGroupName").val('');
      $("#newGroupNameRow").hide();
    }
  });
});

Answer 3

Answer №2

Instead of:

function GroupNameChange()
        {
         ...
        }

Try this approach:

$(document).ready(function()
        {
            $("#IndicationCalculatorGroupId").change(function() {
                if ($("#IndicationCalculatorGroupId option:selected").text() == 'Create a New Group')
                {
                    $("#newGroupNameRow").show();
                }
                else{
                    $("#IndicationCalculatorNewGroupName").val('');
                    $("#newGroupNameRow").hide();
                }
            });
        });

The function GroupNameChange() currently needs to be called once (the first time) for the change handler to be registered. It is preferable to have that happen on page load (at the ready event). You can eliminate the need to call GroupNameChange() within the onchange event and let .change() handle it automatically. You may remove the onchange code and instead call updateField from the .change() handler you've defined.

Alternatively, if you prefer to keep GroupNameChange, you can delete

$("#IndicationCalculatorGroupId").change(function() {
});

and retain only the lines where the function resides. This way, GroupNameChange will be executed every time as per your suggestion without triggering the anonymous change handler previously included.

Answer 4

Instead of:

function GroupNameChange()
        {
         ...
        }

Try this approach:

$(document).ready(function()
        {
            $("#IndicationCalculatorGroupId").change(function() {
                if ($("#IndicationCalculatorGroupId option:selected").text() == 'Create a New Group')
                {
                    $("#newGroupNameRow").show();
                }
                else{
                    $("#IndicationCalculatorNewGroupName").val('');
                    $("#newGroupNameRow").hide();
                }
            });
        });

The function GroupNameChange() currently needs to be called once (the first time) for the change handler to be registered. It is preferable to have that happen on page load (at the ready event). You can eliminate the need to call GroupNameChange() within the onchange event and let .change() handle it automatically. You may remove the onchange code and instead call updateField from the .change() handler you've defined.

Alternatively, if you prefer to keep GroupNameChange, you can delete

$("#IndicationCalculatorGroupId").change(function() {
});

and retain only the lines where the function resides. This way, GroupNameChange will be executed every time as per your suggestion without triggering the anonymous change handler previously included.

Answer 5

Answer №3

When the value is changed in a select box, the onChange event is triggered after clicking out of the box. To capture the change as it happens, consider using the mouseDown() event instead.

Answer 6

When the value is changed in a select box, the onChange event is triggered after clicking out of the box. To capture the change as it happens, consider using the mouseDown() event instead.

Trouble with the JQuery event listener onchange()

Answer №1

Answer №2

Answer №3

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