How to get a property value from database based on

2020-05-03 12:25发布

站内问答 / JavaScript
1306 2 6

I want to get a property of an entity based on passing id's of selected items from cascaded dropdown list...On every change in level 1 or in level 2 of cascaded drop down list, price must be updated.

I have implemented cascaded drop down list. On page load Leaguedropdown (Level 1) populates and second LeagueDivisiondropdown (Level 2) populates when I select any item from Level 1. I have to implement Price Calculator which should calculate price value depending upon selected items from cascaded drop down list, all prices are stored in database and I am using Entity Framework. I am using .change() method and sending getJson request for Level 2 which is working fine. I also want same functionality on Level 1 but I already used .change() method to populate LeagueDivision so I don't have idea how to implement this on Level 1 too.

I will appreciate if some one will guide me and will be thankful.

Here is View and Script

<body>
<p id="message"></p>
@using (Html.BeginForm("PriceCalculatorIndex", "PriceCalculator", FormMethod.Post,
                                      new { enctype = "multipart/form-data" }))
{

    <div>
        @Html.LabelFor(m => m.SelectedLeague, new { @class = "control-lebel" })
        @Html.DropDownListFor(m => m.SelectedLeague, Model.LeagueList, new { @class = "form-control" })
        @Html.ValidationMessageFor(m => m.SelectedLeague)
    </div>
    <div>
        @Html.LabelFor(m => m.SelectedLeagueDivision, new { @class = "control-lebel" })
        @Html.DropDownListFor(m => m.SelectedLeagueDivision, Model.LeagueDivisionList, new { @class = "form-control" })
        @Html.ValidationMessageFor(m => m.SelectedLeagueDivision)
    </div>
    <div>
        @Html.LabelFor(m => m.Price)
        @Html.DisplayFor(m => m.Price)
    </div>
}
<!-- JS includes -->
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
<script src="//ajax.aspnetcdn.com/ajax/jquery.validate/1.11.1/jquery.validate.min.js"></script>
<script src="//ajax.aspnetcdn.com/ajax/mvc/4.0/jquery.validate.unobtrusive.min.js"></script>
<script type="text/javascript">
    var leaguedivisionUrl = '@Url.Action("Fetchleaguedivision")';
    var updatePrice = '@Url.Action("updatePrice")';
    var divisions = $('#SelectedLeagueDivision');
    $('#SelectedLeague').change(function () {
        divisions.empty();
        $.getJSON(leaguedivisionUrl, { ID: $(this).val() }, function (data) {
            if (!data) {
                return;
            }
            divisions.append($('<option></option>').val());
            $.each(data, function (index, item) {
                divisions.append($('<option></option>').val(item.Value).text(item.Text));
            });
        });
    });

    $('#SelectedLeagueDivision').change(function () {

        $.getJSON(updatePrice, { LeagueDivisionId: $(this).val(), LeagueId: $('#SelectedLeague').val() }, function (data) {
            if (!data) {
                return;
            }
            alert(data);
            //document.getElementById('#message').innerHTML = data;
        });
    });
</script>

JSON Result to fetch price from database

 public JsonResult updatePrice(int LeagueId, int LeagueDivisionId)
    {

        HostBoostersDBEntities2 db = new HostBoostersDBEntities2();
        CalculatorPrice updatedPrice = db.CalculatorPrices
           .Where(x => x.LeagueId == LeagueId
               &&
               x.LeagueDivisionId == LeagueDivisionId)
               .FirstOrDefault();
        decimal updatedPriceToView = (decimal)updatedPrice.Price;
        return Json(updatedPriceToView.ToString(), JsonRequestBehavior.AllowGet);
    }

2条回答
可以哭但决不认输i
2楼-- · 2020-05-03 12:53

I have implemented successfully in this way.

@using (Html.BeginForm("PriceCalculatorIndex", "PriceCalculator", FormMethod.Post,
                                      new { enctype = "multipart/form-data" }))
{

    <div>
        @Html.LabelFor(m => m.SelectedLeague, new { @class = "control-lebel" })
        @Html.DropDownListFor(m => m.SelectedLeague, Model.LeagueList, new { @class = "form-control" })
        @Html.ValidationMessageFor(m => m.SelectedLeague)
    </div>
    <div>
        @Html.LabelFor(m => m.SelectedLeagueDivision, new { @class = "control-lebel" })
        @Html.DropDownListFor(m => m.SelectedLeagueDivision, Model.LeagueDivisionList, new { @class = "form-control" })
        @Html.ValidationMessageFor(m => m.SelectedLeagueDivision)
    </div>
    <div>
        <label>
            price :
        </label>
        <span id="spPrice"></span>
    </div>
}
<!-- JS includes -->
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
<script src="//ajax.aspnetcdn.com/ajax/jquery.validate/1.11.1/jquery.validate.min.js"></script>
<script src="//ajax.aspnetcdn.com/ajax/mvc/4.0/jquery.validate.unobtrusive.min.js"></script>
<script type="text/javascript">
    $(function () {
        LoadDivisionsAndPrice()
    });
    var leaguedivisionUrl = '@Url.Action("Fetchleaguedivision")';
    var updatePrice = '@Url.Action("updatePrice")';
    var divisions = $('#SelectedLeagueDivision');
    $('#SelectedLeague').change(function () {
        LoadDivisionsAndPrice();
    });
    $('#SelectedLeagueDivision').change(function () {
        LoadPrice();
    });
    function LoadPrice() {
        $.getJSON(updatePrice, { LeagueId: $('#SelectedLeague').val(), LeagueDivisionId: $('#SelectedLeagueDivision').val() }, function (data) {
            if (!data) {
                return;
            }
            document.getElementById('spPrice').innerText = data.Price;
        });
    }
    function LoadDivisionsAndPrice()
    {
        divisions.empty();
        $.getJSON(leaguedivisionUrl, { ID: $('#SelectedLeague').val() }, function (data) {
            if (!data) {
                return;
            }
            divisions.append($('<option></option>').val());
            $.each(data, function (index, item) {
                divisions.append($('<option></option>').val(item.Value).text(item.Text));
            });
            LoadPrice();
        });
    }        
</script>

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对你真心纯属浪费
3楼-- · 2020-05-03 13:13

Please try this code. Give reference of my javascript comments where you think I have still mis-understood the question.

<script type="text/javascript">
    var leaguedivisionUrl = '@Url.Action("Fetchleaguedivision")';
    var updatePrice = '@Url.Action("updatePrice")';
    var divisions = $('#SelectedLeagueDivision');

    function bindLeagueDivisionData(data) {
        divisions.empty();
        $.each(data, function(index, item) {
            divisions.append($('<option></option>').val(item.Value).text(item.Text));
        });
    }

    function getUpdatedPrice(leagueId, divisionId) {
        $.getJSON(updatePrice, {
            LeagueDivisionId: divisionId,
            LeagueId: leagueId
        }, function(data) {
            if (!data) {
                return;
            }
            alert(data);
            //document.getElementById('#message').innerHTML = data;
        });
    }

    $('#SelectedLeague').change(function() {
        if (divisions.find("option").length == 0) {
            /*The division list is empty, fetch the divisions*/
            $.getJSON(leaguedivisionUrl, {
                ID: $(this).val()
            }, function(data) {
                if (!data) {
                    return;
                }
                /*Once division data is bound, get the price for the league and first selected division. If you choose to leave first division as empty, your wish; just remove the contents of done in that case*/
                $.when(bindLeagueDivisionData(data)).done(function() {
                    getUpdatedPrice($(this).val(), $('#SelectedLeagueDivision'));
                });
            });
        } else {
            /*Divisions are already present just get the price for the combination*/
            getUpdatedPrice($(this).val(), $('#SelectedLeagueDivision'));
        }
    });

    $('#SelectedLeagueDivision').change(function() {
        /*Get the price for the combination*/
        getUpdatedPrice($('#SelectedLeague').val(), $(this).val());
    });
</script>
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