Uncaught referenceerror $ is not defined javascript error

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Uncaught referenceerror $ is not defined javascript error

Learn what you can do to fix JavaScript function is not defined errorSometimes, you may come across JavaScript function is not defined error that looks like the following:Uncaught ReferenceError: doAction is not defined The ReferenceError as in the case above is caused when you call something that's not defined in JavaScript. Let me show you several things you can do to fix the error.One of the small mistakes that could cause the error is that you haven't defined the function properly. You need to define the function using either the function keyword:function doAction() { // your function code here } Or using the arrow function syntax as follows:const doAction = () => { // your function code here }; Please keep in mind that functions defined through function expressions must be defined before the call. Function expressions are functions that you defined through a variable keyword as follows:var fnAction = function () {}; // or let fnAction = () => {}; From the example code above, the variable fnAction will be hoisted, but the function declaration is not, so it will be undefined as shown below:fnAction(); // fnAction is not defined let fnAction = () => { console.log("Executing action"); }; See also: JavaScript hoisting behaviorThat's why it's always better to define the function before calling it.When you have defined the function, try calling it immediately below the declaration to see if it works:function doAction() { // your function code here } doAction(); // test the function call If it's running without any error, then you may have several lines of code after the declaration that causes the script to malfunction.Make sure the entire script has no errorIf you're putting the function into a script and calling it from an HTML tag, you need to make sure that the entire script has no error or the function won't be loaded.For example, notice how there is an extra ) right next to getElementById call: Function not defined Click me document.getElementById("action")); // extra ')' here function fnAction(){ console.log("Executing action"); } Although there's no error on the fnAction() code, an error in any part of the script will cause the browser to ignore the rest of that script. You need to fix the error first so the rest of the code can be executed by the browser.One way to see if you have any error is to run the HTML page and check on the console as follows:JavaScript error on the consoleYou may find the ReferenceError fixed itself as you fix JavaScript errors from your scripts.Make sure the script is loaded before the call.Finally, the function is not defined error can also be caused by calling the function before the script is loaded to the browser. Suppose you have a JavaScript file separated from your HTML file as follows:// script.js function fnAction() { console.log("executing action"); } Then you load the script into your HTML file, but you call the fnAction function before you load the script as follows: Load script demo fnAction(); // Uncaught ReferenceError: fnAction is not defined The same also happens when you call it on the tag: Function not defined fnAction(); To fix this, you need to call the function below the call: Function not defined fnAction(); Those are the three ways you can try to fix function is not defined error in JavaScript.Related articles: If you are working with the JQuery library, then there is a pretty good chance that you will encounter the following JavaScript error at some point in time: Uncaught ReferenceError: $ is not defined Typically speaking, this ReferenceError occurs when a developer attempts to use the JQuery library before they have actually included it. Take the following example, which will reproduce the issue: //Hide element using JQuery. $('#test').hide(); In the code snippet above, I attempted to use JQuery's hide() method before I had included the library. As a result, an "uncaught ReferenceError" will be thrown. This is because the script is attempting to reference a variable that doesn't exist. To fix this, we need to include the library before we attempt to use any of its methods: //Hide element using JQuery. $('#test').hide(); Failure to include the library. If you are encountering this error, it is because you have not included the JQuery library in your page. That, or an external plugin that you are using relies on the library. For example: The popular plugin "Cropper" relies on JQuery. This means that you must include cropper.js like so: If you fail to load JQuery before cropper.js, your script will cough up a ReferenceError. The path to your JQuery file is incorrect. In some cases, developers will reference the wrong URL or path to the JQuery file. As a result, a 404 will occur and any succeeding scripts that attempt to reference the library will throw an error. To make sure that this isn't happening, I would suggest that you open the Network tab in your browser's developer tools and make sure that the JavaScript file is actually being loaded. Here is an example of what Chrome's Developer Tools might display if the file isn't being loaded correctly: In the screenshot above, you can see that my attempt to load "jquery.min.js" has resulted in a 404 error. Server errors. In certain cases, you might be loading the library from an external CDN server. If that is the case, then you will need to make sure that the CDN in question isn't down or experiencing technical issues. Mixed content warnings. A browser will refuse to load non-HTTPS resources if the page in question has been loaded over HTTPS / SSL. i.e. If your website is SSL-enabled, then the browser will refuse to load your JQuery file if you are referencing it using the regular "http://" protocol. Example:

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