Jquery declare int? variable in asp.net mvc4

Question

Good day,

I have an asp.net mvc4 project where I tried declare variable in jquery. Problem to be concluded in next: my data get from the model @Model.EducationProgramBachelorId and the property EducationProgramBachelorId in my class declared as int?. And when i try declare it in my jquery code:

var progId = @Model.EducationProgramBachelorId;

R# told me that int? University.EducationProgramBachelorId Syntax Error

I need this variable in my if/else condition where i want to do next:

if(progId != null){
//Do something
}
else{
//Do something
}

My questions is:

How can I declare int? variable in jquery?
In if statement when it's true I need write just return for that my function is closed or something else?

EDIT

Here is the part of my RAZOR page:

@model Models.Entities.University

@Html.DropDownList("EducationProgramBachelorId", String.Empty)
                            @Html.ValidationMessageFor(model => model.EducationProgramBachelorId)

<script type="text/jscript">

$(document).ready(function () {
        var progId = @Model.EducationProgramBachelorId; //here is I have an error and function didn't work
        if(progId != null){
            return;
        }
        else{
            $.getJSON('/Administrator/ProgramList/' + 1, function (data) {
                var items = '<option>Select a Program</option>';
                $.each(data, function (i, program) {
                    items += "<option value='" + program.Value + "'>" + program.Text + "</option>";
                });
                $('#EducationProgramBachelorId').html(items);
            });
        }

    });

</script>

you don't need to declare a variable as an int in javascript. Where are you seeing the error? it doesn't look like a javascript error at all. — user400654
– user400654, Commented Sep 12, 2013 at 15:59
Is ReSharper telling you that there's an error, or is the compiler or runtime telling you that there's an error? ReSharper could be mistaken. — David
– David, Commented Sep 12, 2013 at 16:00
After this line of code var progId = @Model.EducationProgramBachelorId I have red wavy line where have my error — BorHunter
– BorHunter, Commented Sep 12, 2013 at 16:07
@BorHunter is that line in a .js file or an asp.net page? We need more information. It sounds to me like that should be in some javascript but it's not. — Reinstate Monica Cellio
– Reinstate Monica Cellio, Commented Sep 12, 2013 at 16:10
@BorHunter: I've had issues in the past where Visual Studio didn't understand a mix of Razor code and JavaScript code in a View. But that doesn't prevent it from actually working. Does the code compile? Does it run? Are there actual errors or just intellisense errors? — David
– David, Commented Sep 12, 2013 at 16:12

James Lawruk · Accepted Answer · 2013-09-12 16:29:20Z

1

If a nullable int? property is rendered to the view, it will not output anything. Can you create a new property in your model that will convert the int? to a normal int? Then return a zero if the EducationProgramBachelorId variable is null.

public int EducationProgramBachelorJSInt
{
    get
    {
        return EducationProgramBachelorId.HasValue ? 
        EducationProgramBachelorId.Value : 0;
    }
}

Then your JQuery code will look like this.

var progId = @Model.EducationProgramBachelorJSInt;
if(progId != 0){
    //Do something
}
else{
    //Do something
}

edited Sep 12, 2013 at 16:29

answered Sep 12, 2013 at 16:17

James Lawruk

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Satpal · Accepted Answer · 2013-09-12 16:35:45Z

1

You can try,

 var progId = @(Model.EducationProgramBachelorId.HasValue ? Model.EducationProgramBachelorId : 0);

Thus if Model.EducationProgramBachelorId is null its progId will be set to 0

answered Sep 12, 2013 at 16:35

Satpal

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