Uncaught TypeError | Is Not A Function | Solution

Aug 15, 2023

Uncaught TypeError | Is Not A Function | Solution

Have you encountered an error like:
- Uncaught TypeError
- Some selector is not a function
- jQuery is not a function
- owlCarousel is not a function
- slickSlider is not a function

And this error may not be in every page of your website. It will be at some pages. I have taken a slider as example and created two pages. At one page I have initialized the slider and other page only has simple text. In this tutorial we will see this error and will solve it.

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#debugging #javascript #webdevelopment #TypeError #NotAFunction #javascripttutorial

Content

6.72 -> welcome to webstylepress if you are new here consider subscribing

10.16 -> and hit bell icon have you encountered an error like uncut type error some selector

16.88 -> is not a function or jQuery is not a function or owl carousel is not a function or slick

24.08 -> slider is not a function and this error may not be in every page of your website

30.88 -> it will be at some pages i will elaborate it by an example i have got two pages here index and about

43.36 -> i have got jquery linked with it and then custom.js in both pages

59.6 -> i will use owl carousel at one page from these

67.36 -> owl carousel is a popular slider this is owl carousel v2.

76.24 -> here are the demos

80.16 -> this is basic demo for owl carousel

86.24 -> html is here and setup is here initially this is the initializer

94.88 -> in index page i will link owl carousel by using cdn js links

102.72 -> cdnjs.com and here i can search for owl carousel

111.76 -> this is owl carousel 2.

120.96 -> i will need its javascript file owlcarousel.min.js copy script tag

127.76 -> and only index i will use it below jquery and above custom.js in custom.js we will initialize it

138.96 -> and it depends on jquery it that is why it is below jquery and before custom.js

149.6 -> then we will need owl carousel min dot

152.24 -> css

160.32 -> and let's copy default theme as well all theme default here save

176.32 -> and now let's copy this example this is html copy it and paste it here

189.2 -> and then we will need it set up this one

194.8 -> we are going to initialize it right this is our class owl dash carousel this class at this

202.48 -> class we will initialize all carousel in our custom.js file we will use document dot ready

217.84 -> function and here is our initializer

234.8 -> at owl carousel class

247.36 -> let's go to our index page and this is index page and it is working

254.64 -> we have not implemented it at about page so we right click here inspect and we go to console

274 -> then we go to about page

278.56 -> go to console and here you see this error uncut type error

287.52 -> dollar sign dot owl carousel is not a function the reason behind it is that

294.72 -> owl carousel is being initialized at an element but that element is not present in about page

305.76 -> element is this one in index page but this element is not present in about page

314.72 -> and we are trying to initialize it so when jquery will not find this element

322.08 -> but we are initializing it at this class it will complain the solution is to check if the element

332.56 -> exists only then we should initialize owl carousel or any other library at it like this

345.84 -> if

354.64 -> jquery or dollar sign dot owl carousel that is the class or element

363.92 -> dot length if this is present if this element owl dash carousel is present then initialize

378.24 -> owl carousel for that element and now if we refresh the about page the error is gone

390.88 -> and our slider still works at index page

398.72 -> you can also specify if owl dash carousel dot length is not equal to zero that will also work

414.24 -> refresh and there is no error

421.44 -> so always check before you initialize always check if element exists

429.28 -> this goes for any other library or plugin as well whenever you initialize any functionality

436.16 -> for an element always check if that element is present in page otherwise do not initialize it

444.64 -> that is the solution basically this if statement make sure you use it make sure you check if the

454.24 -> element is present in page then initialize script over it all right give this video

463.36 -> like subscribe to channel and press bell icon stay tuned and i will see you in the next video

Source: https://www.youtube.com/watch?v=SdAt1qbWB-o