ASP .NET CORE Charts Uncaught ReferenceError: $ is not defined

[PawelKanarekParticipant]

Hi everyone!
I have problems with presenting charts on ASP.NET CORE 2.0, using MVC.

I’ve installed yours product (followed this instruction on github).

So, firstly i added nuget https://www.nuget.org/packages/Chart.AspNetCore.Mvc/ to my existing project, updated _ViewImports.cshtml, then i rebuild solution and finally added a new chart object.

Sadly i can’t see chart on the screen, there is some JS error with message “Uncaught ReferenceError: $ is not defined” as seen on this screenshot

This is my Model

    public class ChartDataItem
    {
        public int Keith
        {
            get;
            set;
        }
        public int Erica
        {
            get;
            set;
        }
        public int George
        {
            get;
            set;
        }
        public string Day
        {
            get;
            set;
        }
    }

This is my Index method

        public async Task<IActionResult> Index()
        {
            return View(new List<ChartDataItem>()
            {
                new ChartDataItem() { Day="Monday", Keith = 30, Erica = 15, George=25 },
                new ChartDataItem() { Day="Tuesday", Keith = 25, Erica = 25, George=30 },
                new ChartDataItem() { Day="Wednesday", Keith = 30, Erica = 20, George=25 },
                new ChartDataItem() { Day="Thursday", Keith = 35, Erica = 25, George=45 },
                new ChartDataItem() { Day="Friday", Keith = 20, Erica = 20, George=25 },
                new ChartDataItem() { Day="Saturday", Keith = 30, Erica = 20, George=30 },
                new ChartDataItem() { Day="Sunday", Keith = 60, Erica = 45, George=90 }
            });
        }

and finally this is my view

@model IEnumerable<MeteoWww.Models.ChartDataItem>
@using jQWidgets.AspNetCore.Mvc.TagHelpers;
@{
    ViewData["Title"] = "Index";

    Padding padding = new Padding() { Left = 5, Top = 5, Right = 35, Bottom = 5 };
    Padding titlePadding = new Padding() { Left = 90, Top = 0, Right = 0, Bottom = 10 };
    Rectangle legendPosition = new Rectangle() { Left = 520, Top = 140, Width = 100, Height = 100 };
    FormatSettings formatSettings = new FormatSettings() { Sufix = "%", DecimalPlaces = 1 };
}
<div class="example-description">ASP .NET MVC Chart Line Series Example</div><br />
<jqx-chart style="width: 850px; height: 500px;" color-scheme="scheme02" padding="padding" title-padding="titlePadding" title="Fitness & exercise weekly scorecard" description="Time spent in vigorous exercise" show-legend="true" legend-position="legendPosition" source="Model">
    <jqx-chart-x-axis datafield="Day" show-grid-lines="true"></jqx-chart-x-axis>
    <jqx-chart-series-groups>
        <jqx-chart-serie-group show-labels="true" columns-gap-percent="50" series-gap-percent="0" type=@SerieType.Line>
            <jqx-chart-value-axis axis-size="auto" display-value-axis="true" description="Time in minutes" tick-marks-color="#888888" min-value="0" max-value="100" unit-interval="10"></jqx-chart-value-axis>
            <jqx-chart-series>
                <jqx-chart-serie symbol-type="square" datafield='Keith' display-text='Keith'></jqx-chart-serie>
                <jqx-chart-serie symbol-type="square" datafield='Erica' display-text='Erica'></jqx-chart-serie>
                <jqx-chart-serie symbol-type="square" datafield='George' display-text='George'></jqx-chart-serie>
            </jqx-chart-series>
        </jqx-chart-serie-group>
    </jqx-chart-series-groups>
</jqx-chart>

Can you guys help me to solve this error? You’ve made a great work on those widgets and it would be awesome to use them in my project.

[PawelKanarekParticipant]

Any ideas? I think i did not install some javascripts…

But i don’t see anywhere complete instruction how to install those charts for total newbie like i’m. I followed only this instruction and i think this is to little to activate those charts.

[Peter StoevKeymaster]

Hi Pawel,

The installation instructions are available here: https://www.jqwidgets.com/asp.net-core-mvc-tag-helpers-documentation/.

$ is undefined means that jQuery reference is not available in the code.

Best Regards,
Peter Stoev

jQWidgets Team
https://www.jqwidgets.com

[jefryarchParticipant]

Basically $ is an alias of jQuery() so when you try to call/access it before declaring the function, it will endup throwing this $ is not defined error . This usually indicates that jQuery is not loaded and JavaScript does not recognize the $. Even with $(document).ready , $ is still going to be undefined because jquery hasn’t loaded yet.

To solve this error:

Load the jQuery library at the beginning of all your javascript files/scripts which uses $ or jQuery, so that $ can be identified in scripts .

There can be multiple other reasons for this issue:

* Path to jQuery library you included is not correct
* The jQuery library file is corrupted
* Working offline
* Conflict with Other Libraries

[thinsysParticipant]

Are you a asp programmer? use thin client and enjoy

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[thenexttechParticipant]

ASP .NET CORE Charts Uncaught ReferenceError: $ is not defined” indicates a common issue encountered when attempting to utilize jQuery within an ASP .NET Core application. This error typically occurs when the jQuery library is not properly loaded or referenced in the project. To resolve this issue, ensure that the jQuery library is included and correctly referenced in the HTML file or layout view where the ASP .NET Core Charts are being implemented. You can do this by either adding a CDN link to the jQuery library or by including the jQuery script file locally in your project. Once jQuery is properly loaded, the “Uncaught ReferenceError: $ is not defined” error should be resolved, allowing you to successfully integrate ASP .NET Core Charts with jQuery functionality.
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[noroj99012Member]

<p> </p>
<hr />
<h1>Hassle-Free Travel: Taking a Taxi from Heathrow to Central London and Whitechapel</h1>
<p>Heathrow Airport is the main gateway for international travelers arriving in the UK. With its five busy terminals, navigating your onward journey from the airport can feel overwhelming. For those heading to Central London or specific areas like Whitechapel, choosing the right mode of transportation is essential for a smooth start to your trip. Taking a taxi from Heathrow to Central London or a taxi from Heathrow Airport to Whitechapel offers unmatched convenience, comfort, and peace of mind — especially after a long flight.</p>
<h2>Why Choose a Taxi from Heathrow?</h2>
<p>Heathrow is well connected by trains and buses, but there are many reasons why travelers prefer taking a taxi:</p>

• <p>Door-to-door service: No need to navigate public transport with luggage.</p>
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<p>Whether you’re a tourist, a business traveler, <span data-sheets-root=”1″>Taxi from Heathrow Airport to Whitechapel </span> relaxing and direct journey to your destination.</p>
<h2>Taking a Taxi from Heathrow to Central London</h2>
<p>Central London is the heart of the city and includes areas such as Westminster, Covent Garden, Soho, and the City of London. The journey from Heathrow to Central London is around 15 to 20 miles depending on the specific location.</p>
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<h2>Traveling by Taxi from Heathrow Airport to Whitechapel</h2>
<p>Whitechapel is a historic and vibrant district located in East London. Known for its cultural diversity, street markets, and art scene, it has become a popular destination for both visitors and locals. Whitechapel is also home to the Royal London Hospital and is close to commercial areas like Shoreditch and Liverpool Street.</p>
<p>A taxi from Heathrow Airport to Whitechapel covers a distance of around 20 to 23 miles and usually takes between 50 minutes to 1 hour and 15 minutes, depending on the time of day and traffic.</p>
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• <p>You are staying at a hotel or apartment in East London.</p>
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<p> </p>

[Author]

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