How to write jquery file tree structure
With the development of web applications, we often need to display some visual organizational structures in the application, and file structure is one of them. The jQuery file tree structure is a very efficient way to display the hierarchical structure of files and folders.
Next, we will introduce you how to use jQuery to create a file tree structure.
- Import jQuery library
First, you need to import the jQuery library file. Add the following code in the head tag of the page:
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
</head>- Create HTML Schema
Next, we need to create the HTML schema to display the file tree structure. We will create a simple div container to display the file tree hierarchy.
<div class="file-tree">
<ul>
<li><a href="#">Folder 1</a>
<ul>
<li><a href="#">Subfolder 1</a></li>
<li><a href="#">Subfolder 2</a></li>
</ul>
</li>
<li><a href="#">Folder 2</a></li>
<li><a href="#">Folder 3</a>
<ul>
<li><a href="#">Subfolder 1</a></li>
</ul>
</li>
</ul>
</div>- Writing JavaScript code
Next, we will write jQuery code to convert the HTML structure into a file tree structure. We will use jQuery's "each()" method to iterate over the HTML structure in order to convert it into a file tree structure.
$(document).ready(function () {
$(".file-tree ul").hide();
$(".file-tree li").each(function () {
if ($(this).children("ul").length > 0) {
$(this).addClass("parent");
}
});
$(".file-tree a").click(function () {
var children = $(this).parent("li.parent").children("ul");
if (children.is(":visible")) {
children.hide();
} else {
children.show();
}
});
});In this code, we are looping through each "li" element and checking if there is a "ul" element in its child elements. If so, we mark it as the parent folder. We then hide all the folder's subdirectories (by calling the "hide()" method) and attach a click event handler to show them (by calling the "show()" method).
- Style design
Finally, we need some CSS styles to make the file tree structure look neater and more beautiful.
.file-tree ul, li {
margin: 0;
padding: 0;
list-style: none;
}
.file-tree ul {
margin-left: 1em;
position: relative;
}
.file-tree li.parent > a:before {
content: "+ ";
}
.file-tree ul ul:before {
content: "";
position: absolute;
top: 0;
bottom: 0;
left: 0.5em;
border-left: 1px solid #ccc;
}This CSS code transforms the file tree structure into a more readable visual design. It sets the margins and padding of all unordered lists and list items to zero, and sets all items in the list items to unmarked. Additionally, it uses the " " symbol as a CSS pseudo-element to represent the parent folder, while using a solid border to represent the child folders.
Summary
By using jQuery to create a file tree structure, you can easily display complex hierarchies and customize their appearance and behavior by using CSS styles. As your proficiency with JavaScript and jQuery increases, you can also create more complex file tree structures to suit your specific needs.
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