I'm experiencing difficulties with JS on my website. Details are provided below – any suggestions on how to resolve this issue

Question

I'm experiencing difficulties with JS on my website. Details are provided below – any suggestions on how to resolve this issue

Can someone help me with a web project issue I'm facing? Everything was going smoothly until I tried to add some JS for dynamic functionality. However, when I attempt to access my elements by tag name, ID, or class, they always return null or undefined. Any solutions out there? I'm new at this, so any help would be appreciated. Thanks in advance!

console.log('test1')
window.onload = function() {
      elements.forEach((element) => element.style.color = 'red');
}

// CSS code goes here...

<!DOCTYPE html>

<html lang="en">

<head>
   // HTML and head content...
</head>

<body>
  // Body content...
</body>

<script src="js/myscript.js"></script>

</html>

javascript html css

Answer 1

Answer №1

The issue lies in the timing of loading your JavaScript script before the elements on the page are rendered. To solve this, you can add the defer attribute to the script tag to ensure the script launches after the page rendering is complete.

<script src="js/myscript.js" defer>

When using getElementsByTagName(), it returns a HTMLCollection. Here is a corrected code snippet:

console.log('test1');
let elements = document.getElementsByTagName('p');
for (let i=0; i < elements.length; i++) {
    elements[i].style.color = 'red';
}
console.log(elements);

Also, just a side note - there seems to be a typo with the variable name "elemens" mentioned earlier.

Answer 2

The issue lies in the timing of loading your JavaScript script before the elements on the page are rendered. To solve this, you can add the defer attribute to the script tag to ensure the script launches after the page rendering is complete.

<script src="js/myscript.js" defer>

When using getElementsByTagName(), it returns a HTMLCollection. Here is a corrected code snippet:

console.log('test1');
let elements = document.getElementsByTagName('p');
for (let i=0; i < elements.length; i++) {
    elements[i].style.color = 'red';
}
console.log(elements);

Also, just a side note - there seems to be a typo with the variable name "elemens" mentioned earlier.

Answer 3

Answer №2

            <p class="mp">Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Commodo sed egestas egestas fringilla phasellus faucibus scelerisque eleifend donec. Ipsum consequat nisl vel pretium
                lectus. Justo nec ultrices dui sapien. Aliquam purus sit amet luctus venenatis lectus magna fringilla urna. Maecenas ultricies mi eget mauris. Mauris a diam maecenas sed enim. At quis risus sed vulputate. Nec ullamcorper sit amet risus
                nullam eget felis. Sit amet dictum sit amet justo. Eu facilisis sed odio morbi quis commodo odio aenean.</p>
            <br>
            <p class="mp">Proin nibh nisl condimentum id venenatis. Lectus vestibulum mattis ullamcorper velit sed ullamcorper morbi. Fringilla ut morbi tincidunt augue interdum. Vehicula ipsum a arcu cursus vitae. Consequat nisl vel pretium lectus quam id leo in vitae.
                Mattis rhoncus urna neque viverra justo nec ultrices. Commodo elit at imperdiet dui accumsan sit amet. Nunc sed id semper risus in. At erat pellentesque adipiscing commodo elit. Facilisi nullam vehicula ipsum a arcu cursus vitae. Scelerisque
                viverra mauris in aliquam. Aliquet porttitor lacus luctus accumsan tortor posuere ac ut consequat. Euismod nisi porta lorem mollis aliquam ut porttitor leo.</p><br>
            <!--<marquee><p class="divider">#*************************************************************************************************************************************************************************************************************************************</p></marquee>-->


<!-- always place js in footer -->

<!-- method by classname in javascript-->
<script>
var x = document.getElementsByClassName("mp");
  x[0].style.color = "red";
  x[1].style.color = "blue";
</script>

<!-- method by tag in jquery -->
<script src="https://code.jquery.com/jquery-3.5.1.min.js" integrity="sha256-9/aliU8dGd2tb6OSsuzixeV4y/faTqgFtohetphbbj0=" crossorigin="anonymous"></script>
  
<script>
  jQuery("p").css("color", "yellow");
</script>

</body>

</html>

Answer 4

            <p class="mp">Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Commodo sed egestas egestas fringilla phasellus faucibus scelerisque eleifend donec. Ipsum consequat nisl vel pretium
                lectus. Justo nec ultrices dui sapien. Aliquam purus sit amet luctus venenatis lectus magna fringilla urna. Maecenas ultricies mi eget mauris. Mauris a diam maecenas sed enim. At quis risus sed vulputate. Nec ullamcorper sit amet risus
                nullam eget felis. Sit amet dictum sit amet justo. Eu facilisis sed odio morbi quis commodo odio aenean.</p>
            <br>
            <p class="mp">Proin nibh nisl condimentum id venenatis. Lectus vestibulum mattis ullamcorper velit sed ullamcorper morbi. Fringilla ut morbi tincidunt augue interdum. Vehicula ipsum a arcu cursus vitae. Consequat nisl vel pretium lectus quam id leo in vitae.
                Mattis rhoncus urna neque viverra justo nec ultrices. Commodo elit at imperdiet dui accumsan sit amet. Nunc sed id semper risus in. At erat pellentesque adipiscing commodo elit. Facilisi nullam vehicula ipsum a arcu cursus vitae. Scelerisque
                viverra mauris in aliquam. Aliquet porttitor lacus luctus accumsan tortor posuere ac ut consequat. Euismod nisi porta lorem mollis aliquam ut porttitor leo.</p><br>
            <!--<marquee><p class="divider">#*************************************************************************************************************************************************************************************************************************************</p></marquee>-->


<!-- always place js in footer -->

<!-- method by classname in javascript-->
<script>
var x = document.getElementsByClassName("mp");
  x[0].style.color = "red";
  x[1].style.color = "blue";
</script>

<!-- method by tag in jquery -->
<script src="https://code.jquery.com/jquery-3.5.1.min.js" integrity="sha256-9/aliU8dGd2tb6OSsuzixeV4y/faTqgFtohetphbbj0=" crossorigin="anonymous"></script>
  
<script>
  jQuery("p").css("color", "yellow");
</script>

</body>

</html>

Answer 5

Answer №3

Enclose your Javascript code within the DOMContentLoaded event

For example,

document.addEventListener("DOMContentLoaded", function(event) { 
   //perform tasks
});

For further details, you can visit:

https://developer.mozilla.org/en-US/docs/Web/API/GlobalEventHandlers/onload

document.addEventListener("DOMContentLoaded", function(event) {
      console.log('test1')
      let elements = document.getElementsByTagName('p');
      for (let i = 0; i < elements.length; i++) {
        elements[i].style.color = 'red';
      }
    });

/* * {
    margin: 0;
} */


}
body {
  margin: 0;
  box-sizing: border-box;
  display: block;
  background: #eee;
}
header {
  color: white;
  background: linear-gradient(to left, #222, black, #222);
  box-sizing: border-box;
  border-bottom: 2px solid #999;
  display: block;
  overflow: hidden;
  width: 100%;
  text-align: center;
  padding: 22px;
  padding-bottom: 20px;
}
header .page-title {
  cursor: pointer;
  display: block;
  font-size: 25px;
  font-variant: small-caps;
  transition: color 1s linear, font-size 1s linear;
}
header .page-title:hover {
  cursor: pointer;
  font-size: 25px;
  color: green;
  text-shadow: 0 0 7px #004800;
  transition: color 1s linear, font-size 1s linear, text-shadow 2s linear;
}
//not working.pagetitle:hover < header {background:black;}
.search {
  float: left;
  text-decoration: none;
  font-size: 15px;
  padding: 17.5px;
  display: inline-block;
  border: none;
  border-left: 1px solid white;
  box-sizing: border-box;
  color: white;
  background: black;
  width: 88%;
}
.icon {
  float: left;
  border-right: none;
  text-align: : left;
  box-sizing: border-box;
  background: black;
  margin: 0;
  display: inline-block;
  color: white;
  padding: 17.5px;
  font-size: 15px;
  width: 6%;
}
input:focus {
  outline: none;
}
.
.
. (continued)

`

Answer 6

Enclose your Javascript code within the DOMContentLoaded event

For example,

document.addEventListener("DOMContentLoaded", function(event) { 
   //perform tasks
});

For further details, you can visit:

https://developer.mozilla.org/en-US/docs/Web/API/GlobalEventHandlers/onload

document.addEventListener("DOMContentLoaded", function(event) {
      console.log('test1')
      let elements = document.getElementsByTagName('p');
      for (let i = 0; i < elements.length; i++) {
        elements[i].style.color = 'red';
      }
    });

/* * {
    margin: 0;
} */


}
body {
  margin: 0;
  box-sizing: border-box;
  display: block;
  background: #eee;
}
header {
  color: white;
  background: linear-gradient(to left, #222, black, #222);
  box-sizing: border-box;
  border-bottom: 2px solid #999;
  display: block;
  overflow: hidden;
  width: 100%;
  text-align: center;
  padding: 22px;
  padding-bottom: 20px;
}
header .page-title {
  cursor: pointer;
  display: block;
  font-size: 25px;
  font-variant: small-caps;
  transition: color 1s linear, font-size 1s linear;
}
header .page-title:hover {
  cursor: pointer;
  font-size: 25px;
  color: green;
  text-shadow: 0 0 7px #004800;
  transition: color 1s linear, font-size 1s linear, text-shadow 2s linear;
}
//not working.pagetitle:hover < header {background:black;}
.search {
  float: left;
  text-decoration: none;
  font-size: 15px;
  padding: 17.5px;
  display: inline-block;
  border: none;
  border-left: 1px solid white;
  box-sizing: border-box;
  color: white;
  background: black;
  width: 88%;
}
.icon {
  float: left;
  border-right: none;
  text-align: : left;
  box-sizing: border-box;
  background: black;
  margin: 0;
  display: inline-block;
  color: white;
  padding: 17.5px;
  font-size: 15px;
  width: 6%;
}
input:focus {
  outline: none;
}
.
.
. (continued)

`

Answer 7

Answer №4

By placing the script tag in the Head section without a delay, the JS is being loaded before the body of the page. To ensure proper functionality, it is recommended to call the script after the body so that the entire page loads first and then the JS can access the DOM correctly. This way, the script will be able to find objects on the page. Adjust the placement like this:

</body>
<script src="name.js"></script>
</html>

Move the script tag after the body tag for it to work seamlessly.

Answer 8

By placing the script tag in the Head section without a delay, the JS is being loaded before the body of the page. To ensure proper functionality, it is recommended to call the script after the body so that the entire page loads first and then the JS can access the DOM correctly. This way, the script will be able to find objects on the page. Adjust the placement like this:

</body>
<script src="name.js"></script>
</html>

Move the script tag after the body tag for it to work seamlessly.

Answer 9

Answer №5

One common reason for this issue is that your javascript is being loaded before the DOM has finished loading.

There are two ways to fix this problem:

First, you can wrap your javascript code like this:

window.onload = function() {
   // Your code
}

Secondly, you can place your script tag after the closing body tag:

</body>
<script src="name.js"></script>
</html>

Answer 10

One common reason for this issue is that your javascript is being loaded before the DOM has finished loading.

There are two ways to fix this problem:

First, you can wrap your javascript code like this:

window.onload = function() {
   // Your code
}

Secondly, you can place your script tag after the closing body tag:

</body>
<script src="name.js"></script>
</html>

I'm experiencing difficulties with JS on my website. Details are provided below – any suggestions on how to resolve this issue

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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