Question

So I have a drop-down list and a text-box:

<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 have JQuery on the page that shows/hides the text-box based on the drop-down selection.

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

But it seems that the first time you change the drop-down to “Create a New Group”, the text-box doesn’t show or do anything, it’s only when you select some other value and THEN select “Create a New Group” does the code start to work.

What’s not wired up correctly?

Answer 1

try to put your code when the page is loaded:

$(function() {

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


});