Trouble with select box initialization resolved

I'm having trouble retrieving the selected value from a dropdown menu as it always returns the first value.

Initially, the dropdown is empty. When I press a button to open the modal and populate the dropdown with options, it seems that the issue arises because I am not loading the select options until the button is clicked. I tested this theory with another dropdown and it worked correctly.

Here is the code for the modal:

<div class="modal fade" id="myModalPremios" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
                <h4 class="modal-title" id="myModalLabel">Premios</h4>
            </div>
            <div id="premios" class="modal-body">
                <jsp:include page="../frag/premios-list-frag.jsp"/>
            </div>
            <div class="modal-footer">
                <button class="btn btn-danger" aria-hidden="true" data-dismiss="modal">Ok</button>
            </div>
        </div>
    </div>
</div>

This is the form inside the modal:

<form class="form-horizontal" role="form">
    <div class="form-group">
        <input type="hidden" id="id" name="quiniela.id" value="${quiniela.id }"/>
    </div>
    <div class="form-group">
        <label for="plantillaOwnerQuiniela" class="col-sm-4 control-label">Quiniela</label>
        <div class="col-sm-5">
            <select class="form-control" name="quiniela.plantillaOwnerQuiniela" id="plantillaOwnerQuiniela"  ${read }>
                <c:forEach items="${lista2 }" var="pl">
                    <option value="${pl.id }"
                    <c:if test="${pl.id == quiniela.plantillaOwnerQuiniela.id}">selected="selected"</c:if>>${pl.nombrePlantillaOwner} - ${pl.precioQuiniela}Bs</option>
                </c:forEach>
            </select>
        </div>
    </div>
</form>

This is how I trigger the modal to show up:

$("#myModal").modal("show");

I have considered that maybe the element is not present in the DOM. Therefore, I attempted to use this function to see if anything would happen but unfortunately, it did not work as expected.

$('#plantillaOwnerQuiniela').on('change',function() {
    var selectVal = $('#plantillaOwnerQuiniela :selected').val();
    alert(selectVal);
});

Answer №1

It appears that the element plantillaOwnerQuiniela is not found in the DOM when you try to bind the change listener.

To solve this issue, consider using the code snippet below:

$("body").on("change", "#plantillaOwnerQuiniela", function(e){
    var selectVal = $(e.currentTarget).val();
    alert(selectVal);
});

By utilizing .on() and delegating the event to the parent element like body, you ensure that the listener will work even if the select element is not loaded on page load.

Answer №2

To properly bind the change event to the popover initialize method, use the following code snippet:

$('.button').popover({ 
    html : true,
    content: function() {
        return $('#popover_content_wrapper').html();
    }                 
}).parent().delegate('#plantillaOwnerQuiniela', 'change', function() {
    alert($(this).val());
});

Check out this example!

Answer №3

To solve the issue, I made sure to include the modal-body class when attempting to retrieve the value of 'if'. The code looked like this:

$('.modal-body #plantillaOwnerQuiniela :selected').val();

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