Uncaught ReferenceError: $ is not defined error in

2019-01-07 22:30发布

站内问答 / JavaScript
1244 4 4

I have this code in jQuery: (the file name is javascript.js ...I was using JavaScript before...)

$(document).ready(function() {
 $("#readFile").click(function() {
    $.get('test.txt', function(data) {
      $("#bottom_pane_options").html(data); // #bottom_pane_options is the div I want the data to go
    }, 'text');
 });
});

...and this in HTML:

<!DOCTYPE html>
<html>
<head>
    <title>Culminating</title>
    <link href="style.css" rel="stylesheet" type="text/css">

    <script type="text/javascript" src="./javascript.js"></script>
    <script
        src="http://maps.googleapis.com/maps/api/js?key=AIzaSyCJnj2nWoM86eU8Bq2G4lSNz3udIkZT4YY&sensor=false">
    </script>

    <script src="http://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>


    <script>
        function initialize()
        {
        var mapProp = {
          center:new google.maps.LatLng(50.569283,-84.378433),
          zoom:5,
          mapTypeId:google.maps.MapTypeId.TERRAIN
          };
        var map=new google.maps.Map(document.getElementById("googleMap"),mapProp);
        }

        google.maps.event.addDomListener(window, 'load', initialize);
    </script>
</head>

<body>
    <div class="content">
        <div id="googleMap"></div>
        <div id="right_pane_results">hi</div>
        <div id="bottom_pane_options">
            <button id="readFile">Read File</button>
        </div>
    </div>
</body>

When I check the console, I get the Uncaught ReferenceError saying that $ is not defined on the first line. I'm assuming that it is referring to the first character on the first line. I got this code from a website and I'm new to jQuery so I'm not sure what is going wrong here.

Any suggestions?

4条回答
祖国的老花朵
2楼-- · 2019-01-07 23:11

Scripts are loaded in the order you have defined them in the HTML.

Therefore if you first load:

<script type="text/javascript" src="./javascript.js"></script>

without loading jQuery first, then $ is not defined.

You need to first load jQuery so that you can use it.

I would also recommend placing your scripts at the bottom of your HTML for performance reasons.

查看更多
0人赞 添加讨论(0) 举报
ゆ 、 Hurt°
3楼-- · 2019-01-07 23:16

Include the jQuery file first:

 <script src="http://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
 <script type="text/javascript" src="./javascript.js"></script>
    <script
        src="http://maps.googleapis.com/maps/api/js?key=AIzaSyCJnj2nWoM86eU8Bq2G4lSNz3udIkZT4YY&sensor=false">
    </script>
查看更多
0人赞 添加讨论(0) 举报
来，给爷笑一个
4楼-- · 2019-01-07 23:31

The MVC 5 stock install puts javascript references in the _Layout.cshtml file that is shared in all pages. So the javascript files were below the main content and document.ready function where all my $'s were.

BOTTOM PART OF _Layout.cshtml:

    <div class="container body-content">
        @RenderBody()
        <hr />
        <footer>
            <p>&copy; @DateTime.Now.Year - My ASP.NET Application</p>
        </footer>
    </div>

    @Scripts.Render("~/bundles/jquery")
    @Scripts.Render("~/bundles/bootstrap")
    @RenderSection("scripts", required: false)

</body>
</html>

I moved them above the @RenderBody() and all was fine.

    @Scripts.Render("~/bundles/jquery")
    @Scripts.Render("~/bundles/bootstrap")
    @RenderSection("scripts", required: false)

    <div class="container body-content">
        @RenderBody()
        <hr />
        <footer>
            <p>&copy; @DateTime.Now.Year - My ASP.NET Application</p>
        </footer>
    </div>

</body>
</html>
查看更多
0人赞 添加讨论(0) 举报
成全新的幸福
5楼-- · 2019-01-07 23:34

Change the order you're including your scripts (jQuery first):

<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<script type="text/javascript" src="./javascript.js"></script>
<script
    src="http://maps.googleapis.com/maps/api/js?key=YOUR_APIKEY&sensor=false">
</script>
查看更多
0人赞 添加讨论(0) 举报
登录 后发表回答
相关问题
查看全部
相关文章
查看全部
收藏的人(4)