What is the process for retrieving a function value from a JavaScript file and displaying it in an ASP.NET MVC view?

Question

What is the process for retrieving a function value from a JavaScript file and displaying it in an ASP.NET MVC view?

I am in the process of separating my view from JavaScript. In my view, I call a function in a JavaScript file to create a chart.

Below is the JavaScript file and the function:

 function createPieChart(chartID, pieChartData) {

chartID.kendoChart({
    dataSource: {
        data: pieChartData
    },
    series: [{
        type: "pie",
        field: "list",
        categoryField: "mm",
        padding: 0,
        labels: {
            visible: true,
        }
    }],
    seriesClick: onClick,
    tooltip: {
        visible: true,
        template: "${ category }"
    },
    legend: {
        position: "bottom"
    }
});

}

 function onClick(e) {    
 var clickedValue = e.category;

  }

Here is a snippet from my view:

  createPieChart($("#pieChart"), result);

The issue I am facing is that the onClick() function in my JavaScript file is triggered when I click on the chart. I need to send this value back with an Ajax call in my view. How can I access this value in my view?

javascript asp.net-mvc view

Answer 1

Answer №1

Could you provide more details on where exactly you need this value in your view? What purpose does this value serve once it is received in the view?

If you have JavaScript available, it implies that you already have access to it in your view, as JavaScript logic runs within the view.

From your onDb(e) function, you can:

1) Retrieve the value and utilize it in the view using JavaScript logic.

In your separate JavaScript file, you might have a function like:

function onDb(e) {    
   var _clicked = e.category;
   return _clicked;
}

Within your view (.cshtml), you could include something similar to:

<script type="text/javascript">
    // Retrieve 'e' wherever needed 
    var requiredValue = onDb(e);
    // Implement any JavaScript / JQuery / Ajax logic ...
</script>

2) If the returned value is needed on the server side, you can make an AJAX request. Here's a guide on making such a request (MVC jquery ajax call with input parameter)

==== UPDATE AFTER COMMENT ====

You can access the onDb function in the same manner as shown in the second code snippet. However, retrieving the input parameter “e” would involve some scripting.

Alternatively, a simpler approach in this scenario would be to move the "Ajax Call" inside the onDb(e) function. Update the onDb(e) function as follows …

function onDb(e) {    
var _clicked = e.category;

$.ajax({
    type: "POST",
    url: '@Url.Action("ControllerName", "ActionName")',
    contentType: "application/json; charset=utf-8",
    data: { valueToSend: _clicked },
    dataType: "json"
    });
}

On the server side, you would have an action similar to:

public class ControllerName : Controller
{
    [HttpPost]
    public ActionResult ActionName(string valueToSend)
    {
        // The required value is stored in the 'valueToSend' input parameter
        //... process as needed and return any ActionResult ...
        return Json("success", JsonRequestBehavior.AllowGet);
    }
}

Answer 2

Could you provide more details on where exactly you need this value in your view? What purpose does this value serve once it is received in the view?

If you have JavaScript available, it implies that you already have access to it in your view, as JavaScript logic runs within the view.

From your onDb(e) function, you can:

1) Retrieve the value and utilize it in the view using JavaScript logic.

In your separate JavaScript file, you might have a function like:

function onDb(e) {    
   var _clicked = e.category;
   return _clicked;
}

Within your view (.cshtml), you could include something similar to:

<script type="text/javascript">
    // Retrieve 'e' wherever needed 
    var requiredValue = onDb(e);
    // Implement any JavaScript / JQuery / Ajax logic ...
</script>

2) If the returned value is needed on the server side, you can make an AJAX request. Here's a guide on making such a request (MVC jquery ajax call with input parameter)

==== UPDATE AFTER COMMENT ====

You can access the onDb function in the same manner as shown in the second code snippet. However, retrieving the input parameter “e” would involve some scripting.

Alternatively, a simpler approach in this scenario would be to move the "Ajax Call" inside the onDb(e) function. Update the onDb(e) function as follows …

function onDb(e) {    
var _clicked = e.category;

$.ajax({
    type: "POST",
    url: '@Url.Action("ControllerName", "ActionName")',
    contentType: "application/json; charset=utf-8",
    data: { valueToSend: _clicked },
    dataType: "json"
    });
}

On the server side, you would have an action similar to:

public class ControllerName : Controller
{
    [HttpPost]
    public ActionResult ActionName(string valueToSend)
    {
        // The required value is stored in the 'valueToSend' input parameter
        //... process as needed and return any ActionResult ...
        return Json("success", JsonRequestBehavior.AllowGet);
    }
}

What is the process for retrieving a function value from a JavaScript file and displaying it in an ASP.NET MVC view?

Answer №1

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