A brief analysis of the connection implementation method based on jQuery

In web development, in order to enhance the user experience, we often need to use some interactive effects to guide user operations, display data, etc., and on this basis, we hope to use connection effects to better display content. In this article, we will introduce the jQuery-based connection implementation method to help you quickly achieve the connection effect.

1. Preparation

Before we start, we need to introduce jQuery and the plug-in we need-jquery.draw.js. In your HTML file, you can introduce it with the following code:

<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/jquery-draw/jquery.draw.js"></script>

In addition, we also need to define some elements for the page, these elements are usually nodes that need to be connected. In this article, we will use a simple HTML layout, as shown below:

<div class="container">
  <div class="node" data-node-id="1"></div>
  <div class="node" data-node-id="2"></div>
  <<div class="node" data-node-id="3"></div>
  <div class="node" data-node-id="4"></div>
</div>

This layout contains four DIV elements named "node", which are the nodes we need to connect. Each node has a custom attribute "data-node-id", which is used to identify the ID of the node, and its value can be any string or number.

2. Draw lines

Before drawing lines between nodes, we need to set some styles first. In the CSS file, you can add the following code:

.node {
  width: 50px;
  height: 50px;
  border: 2px solid #ccc;
  background-color: #fff;
  border-radius: 100%;
  position: absolute;
}

.container {
  height:500px;
}

Next, we need to write jQuery code to achieve the line drawing effect. In this article, we will use the API provided by the jQuery.draw plug-in to achieve the line drawing effect. In your JavaScript file, you can add the following code:

$(function () {
  var nodes = $('.node');

  nodes.draggable({
    containment: ".container",
    start: function(e, ui) {
        ui.helper.css('z-index', 1);
    },
    stop: function(e, ui) {
        ui.helper.css('z-index', 0);
    }
  });

  var connections = [];

  function updateConnection(connection, endX, endY) {
    connection.draw('update', {
      end: [endX, endY]
    });
  }

  function createConnection(startNode, endNode) {
    var connection = $('.container').drawLine({
      strokeStyle: '#ccc',
      strokeWidth: 2,
      rounded: true,
      start: [startNode.position().left + startNode.width() / 2, startNode.position().top + startNode.height() / 2],
      end: [endNode.position().left + endNode.width() / 2, endNode.position().top + endNode.height() / 2]
    });
    connections.push({
      startNode: startNode,
      endNode: endNode,
      connection: connection
    });
  }

  function removeConnection(connectionIndex) {
    connections[connectionIndex].connection.draw('destroy');
    connections.splice(connectionIndex, 1);
  }

  nodes.click(function () {
    var startNode = $(this);

    nodes.not(startNode).click(function () {
      var endNode = $(this);
      var existingConnectionIndex = connections.findIndex(function (connection) {
        return connection.startNode.is(startNode) && connection.endNode.is(endNode);
      });

      if (existingConnectionIndex === -1) {
        createConnection(startNode, endNode);
      } else {
        removeConnection(existingConnectionIndex);
      }
    });
  });
});

The above code implements operations such as draggable nodes, clickable connections, creation and deletion, etc., and also adds some event listening functions to handle the mouse Events that control the creation and deletion of connection line objects. During the implementation process, we used the API provided by the jQuery.draw plug-in, such as the ".drawLine()" method to create a connecting line object, and can set different styles for it, such as line color or line width, etc. In addition, the "connections" array is used to save the created connection line objects so that you can quickly operate when you need to delete a connection line.

3. Realize the effect display

Through the above code, we can successfully realize the connection effect, and can perform related operations on the page. The connection line will be displayed dynamically as the mouse points.

In this article, we introduce the jQuery-based connection implementation method, and explain the specific implementation steps and precautions through code examples. Readers can practice according to this method to achieve interactive effects with pictures and texts, which greatly Improves the interactivity and visibility of the website, bringing a more user-friendly experience.

The above is the detailed content of A brief analysis of the connection implementation method based on jQuery. For more information, please follow other related articles on the PHP Chinese website!