How to use JavaScript to build a decision-making flowchart?
13/03/2024
•
5
min
Assuming that you have the knowledge of JavaScript as well as HTML, here are the steps to build a decision-making flowchart using JavaScript.
Firstly, you will need to include the necessary JavaScript library for creating the decision-making flowchart. For this demonstration, we will use the jsPlumb library.
Before we get started, download the necessary jsPlumb library from the jsPlumb GitHub repository (https://github.com/jsplumb/jsplumb) and link it in your HTML.
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Below is the detailed step-by-step procedure for building a decision-making flowchart:
Step 1: Create an HTML page:
<!DOCTYPE html>
<html>
<head>
<script src="path_to_your_jsplumb.min.js"></script>
<style>
.window{
width:100px;
height:100px;
border:1px solid black;
background-color:lightgrey;
}
</style>
</head>
<body>
<div id="diagramContainer">
<!-- Diagram/Flowchart will be created here -->
</div>
<script src="flowchart.js"></script> <!-- We will create this file -->
</body>
</html>
Step 2: Create the flowchart.js file:
The following script file creates two boxes labeled Node 1 and Node 2, then creates a connection between Node 1 and Node 2.
window.jsPlumb.ready(function() {
var instance = window.jsp = jsPlumb.getInstance({
DragOptions:{ cursor: 'pointer', zIndex:2000 },
PaintStyle:{ stroke:'blue' },
EndpointStyle:{ radius:9, fill:'blue' },
HoverPaintStyle:{stroke:'red' },
EndpointHoverStyle:{fill:'red' },
Container:"diagramContainer"
});
// create two nodes
var node1 = addNode(instance, 'Node 1');
var node2 = addNode(instance, 'Node 2');
// connect nodes
instance.connect({source:node1, target:node2});
});
function addNode(instance, label) {
var d = document.createElement("div");
var id = jsPlumbUtil.uuid();
d.className = "window";
d.id = id;
d.innerHTML = label+"<br>";
document.getElementById("diagramContainer").appendChild(d);
instance.draggable(d);
return id;
}
In this script, jsPlumb's draggable feature is applied to the div's or nodes that are created, which makes the decision boxes draggable. This jsPlumb instance then creates a connection between both the nodes formed.
This is a simple demonstration, and with complex decision-making flowcharts, you would continue this to further nodes. You may then add clickable events, hover descriptions, colors, connector types, etc. as per your requirements.
For a more advanced usage, you could look at using jsPlumbToolkit, a superset of jsPlumb that includes many utilities for building flowcharts, diagrams, etc. A database would likely be beneficial for keeping track of the decisions, choices, and paths in complex flowcharts.
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