Error alert: The $ symbol is not defined

Question

Error alert: The $ symbol is not defined

I followed a tutorial to create an auto-advancing slideshow in JavaScript/jQuery and it worked perfectly on jsfiddle. However, when I transferred everything to Dreamweaver, it stopped functioning. I have triple-checked that all the necessary files are linked (the .js and the .css) as well as the jQuery library. Despite this, the slideshow refuses to work. Below is the code I used.

The HTML

<div class="fadeIn">
            <img src="image1.png" height="500" width="800"/>
            <img src="image2.png" height="500" width="800"/>
            <img src="image3.png" height="500" width="800"/>
            <img src="image4.png" height="500" width="800"/>
        </div>

The CSS

.fadeIn {
    position: relative;
    width: 800px;
    height: 500px;
}

.fadeIn img {
    position: absolute;
    left:0;
    top:0;
}

The JavaScript/jQuery

$(function(){
    $('.fadeIn img:gt(0)').hide();
    setInterval(function(){
    $('.fadeIn :first-child').fadeOut()
        .next('img').fadeIn()
        .end().appendTo('.fadeIn');
    }, 3000);
});

Header Section

<script src="SlideShow.js" type="text/javascript"></script>
<script src="jquery-1.7.2.min.js" type="text/javascript"></script>

<link rel="stylesheet" type="text/css" href="SlideShow.css">

javascript jquery html css slideshow

Answer 1

Answer №1

Upon a quick attempt, I successfully replicated the error you specified. If your functions rely on external JS files that are dependent on other JS libraries, it is crucial to load the library first before loading the JS file with your functions.

For instance, the following setup will not function as intended:

<script src="slideshow.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>

This is because the JS interpreter looks for $ before it is loaded and defined.

However, the following arrangement will work:

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script src="slideshow.js"></script>

Answer 2

Upon a quick attempt, I successfully replicated the error you specified. If your functions rely on external JS files that are dependent on other JS libraries, it is crucial to load the library first before loading the JS file with your functions.

For instance, the following setup will not function as intended:

<script src="slideshow.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>

This is because the JS interpreter looks for $ before it is loaded and defined.

However, the following arrangement will work:

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script src="slideshow.js"></script>

Answer 3

Answer №2

Ensure that your jquery version is up to date. Add the following code to the head section of your HTML:

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script>
$(function(){
    $('.fadein img:gt(0)').hide();
    setInterval(function(){$('.fadein :first-child').fadeOut().next('img').fadeIn().end().appendTo('.fadein');}, 3000);
});
</script>

If you are using Chrome, check the console log for any errors. You can do this by right-clicking, selecting "Inspect Element," and then going to the "Console" tab.

Based on my review, the code appears to be correct and functions as expected.

Answer 4

Ensure that your jquery version is up to date. Add the following code to the head section of your HTML:

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script>
$(function(){
    $('.fadein img:gt(0)').hide();
    setInterval(function(){$('.fadein :first-child').fadeOut().next('img').fadeIn().end().appendTo('.fadein');}, 3000);
});
</script>

If you are using Chrome, check the console log for any errors. You can do this by right-clicking, selecting "Inspect Element," and then going to the "Console" tab.

Based on my review, the code appears to be correct and functions as expected.

Answer 5

Answer №3

Make sure to wait until everything is fully loaded before proceeding. To achieve this, you can use the following code:

window.onload = function() {
    $(function(){
    　　　　('.fadeIn img:gt(0)').hide();
    　　　　setInterval(function(){
    　　　　$('.fadeIn :first-child').fadeOut()
        　　.next('img').fadeIn()
        　　.end().appendTo('.fadeIn');
    　　　　}, 3000);
　　});

}

By waiting for the DOM to finish loading all scripts, you ensure that your function is executed at the appropriate time.

Answer 6

Make sure to wait until everything is fully loaded before proceeding. To achieve this, you can use the following code:

window.onload = function() {
    $(function(){
    　　　　('.fadeIn img:gt(0)').hide();
    　　　　setInterval(function(){
    　　　　$('.fadeIn :first-child').fadeOut()
        　　.next('img').fadeIn()
        　　.end().appendTo('.fadeIn');
    　　　　}, 3000);
　　});

}

By waiting for the DOM to finish loading all scripts, you ensure that your function is executed at the appropriate time.

Error alert: The $ symbol is not defined

Answer №1

Answer №2

Answer №3

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