Tips for effectively integrating javascript and razor syntax in web development:

Question

Tips for effectively integrating javascript and razor syntax in web development:

I am currently working with this code in my razor view and I need to assign values from Razor to some JavaScript variables.

Despite my efforts, the variables are not getting assigned any values.

var listPuntos =[];
    function onSelect(e) {
        var dataItem = this.dataSource.view()[e.item.index()];
        @{
            var proveedorID = 0;
            <text>proveedorID = dataItem.ProveedorID</text>
            var list = new UnitOfWork().PuntosVentaProveedorRepository.Get().Where(x => x.ProveedorID == proveedorID);
            proveedorID = 0;
            <text>listPuntos = list; </text>;
            <text>
                var displayText;
                $.each(listPuntos, function (key, value) {
                    if (displayText == undefined)
                        displayText = value.Nombre + ', ';
                    else
                        displayText = displayText + value.Nombre + ', ';
                });
                document.getElementById("puntos").value = displayText.slice(0,-2);
            </text>
        }

    }

javascript c#asp.net-mvc asp.net-mvc-4 razor

Answer 1

Answer №1

Based on the given concrete example, a good way to start would be by minimizing the number of <text> blocks required. Instead, consider enclosing the shorter C# snippets with @{ … }, which can enhance readability and reduce confusion. For instance:

var listPuntos =[];
    function onSelect(e) {
        var dataItem = this.dataSource.view()[e.item.index()];
        @{ var proveedorID = 0; }
        proveedorID = dataItem.ProveedorID;
        @{ var list = new UnitOfWork().PuntosVentaProveedorRepository.Get().Where(x => x.ProveedorID == proveedorID); }
        proveedorID = 0;
        listPuntos = @Json.Encode(list);
        var displayText;
        $.each(listPuntos, function (key, value) {
            if (displayText == undefined)
                displayText = value.Nombre + ', ';
            else
                displayText = displayText + value.Nombre + ', ';
        });
        document.getElementById("points").value = displayText.slice(0,-2);
    }

To include a C# value in JavaScript code generated by the server, it must be encoded in JavaScript. One effective method is to convert it to JSON format, as demonstrated using Json.Encode. This conversion is illustrated by the line:

        listPoints = @Json.Encode(list);

Although Json.Encode was utilized here, feel free to choose any suitable JSON library that aligns with your project requirements.

Answer 2

Based on the given concrete example, a good way to start would be by minimizing the number of <text> blocks required. Instead, consider enclosing the shorter C# snippets with @{ … }, which can enhance readability and reduce confusion. For instance:

var listPuntos =[];
    function onSelect(e) {
        var dataItem = this.dataSource.view()[e.item.index()];
        @{ var proveedorID = 0; }
        proveedorID = dataItem.ProveedorID;
        @{ var list = new UnitOfWork().PuntosVentaProveedorRepository.Get().Where(x => x.ProveedorID == proveedorID); }
        proveedorID = 0;
        listPuntos = @Json.Encode(list);
        var displayText;
        $.each(listPuntos, function (key, value) {
            if (displayText == undefined)
                displayText = value.Nombre + ', ';
            else
                displayText = displayText + value.Nombre + ', ';
        });
        document.getElementById("points").value = displayText.slice(0,-2);
    }

To include a C# value in JavaScript code generated by the server, it must be encoded in JavaScript. One effective method is to convert it to JSON format, as demonstrated using Json.Encode. This conversion is illustrated by the line:

        listPoints = @Json.Encode(list);

Although Json.Encode was utilized here, feel free to choose any suitable JSON library that aligns with your project requirements.

Answer 3

Answer №2

It is important to separate your HTML code from your JavaScript code in order to maintain a clean and organized structure. Avoid calling server-side code directly from the View during loading. Instead, pass all necessary data via the model property in a suitable format such as JSON, and then populate any client-side lists from the values of that property.

var displayText;
$.each(listPuntos, function (key, value) {
    if (displayText == undefined)
        displayText = value.Nombre + ', ';
    else
        displayText = displayText + value.Nombre + ', ';
});
document.getElementById("puntos").value = displayText.slice(0,-2);

Move code snippets like the one above to the appropriate section, for example:

@section scripts
{
    <script>
    .....
    </script>
}

Answer 4

It is important to separate your HTML code from your JavaScript code in order to maintain a clean and organized structure. Avoid calling server-side code directly from the View during loading. Instead, pass all necessary data via the model property in a suitable format such as JSON, and then populate any client-side lists from the values of that property.

var displayText;
$.each(listPuntos, function (key, value) {
    if (displayText == undefined)
        displayText = value.Nombre + ', ';
    else
        displayText = displayText + value.Nombre + ', ';
});
document.getElementById("puntos").value = displayText.slice(0,-2);

Move code snippets like the one above to the appropriate section, for example:

@section scripts
{
    <script>
    .....
    </script>
}

Tips for effectively integrating javascript and razor syntax in web development:

Answer №1

Answer №2

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