In the field of web development, business process diagram is a graphical tool that allows people to understand the entire business process more clearly. Traditional business process diagrams are usually drawn using tool software, but implementing business process diagrams through JavaScript has great advantages in maintainability and convenience. This article will share how to use pure javascript to implement an html business flow chart.
- Preparation work
First you need to prepare a blank html file and a css file as the body and style sheet. The Bootstrap framework is used in this article. If you don’t want to use it, you can use other css frameworks or directly handwrite css styles.
nbsp;html> <meta> <title>纯javascript实现html业务流程图</title> <link> <link> <div></div> <script></script>
- Writing javascript code
The most commonly used graphics in business process diagrams are rectangles and arrows. We need to first create a rectangle and arrow JavaScript object. In the rectangle object, we need to store the coordinates, width, height, color and text of the rectangle.
function Rectangle(x, y, width, height, color, text) { this.x = x; this.y = y; this.width = width; this.height = height; this.color = color; this.text = text; this.draw = function() { ctx.fillStyle = this.color; ctx.fillRect(this.x, this.y, this.width, this.height); ctx.fillStyle = "#ffffff"; ctx.font = "14px Arial"; ctx.fillText(this.text, this.x + 10, this.y + 20); } }
In the arrow object, we need to store the starting point, end point, line color and arrow shape of the arrow.
function Arrow(fromX, fromY, toX, toY, color) { this.fromX = fromX; this.fromY = fromY; this.toX = toX; this.toY = toY; this.color = color; this.draw = function() { var headlen = 10; var angle = Math.atan2(this.toY - this.fromY, this.toX - this.fromX); ctx.beginPath(); ctx.moveTo(this.fromX, this.fromY); ctx.lineTo(this.toX, this.toY); ctx.strokeStyle = this.color; ctx.lineWidth = 2; ctx.stroke(); ctx.beginPath(); ctx.moveTo(this.toX, this.toY); ctx.lineTo(this.toX - headlen * Math.cos(angle - Math.PI / 6), this.toY - headlen * Math.sin(angle - Math.PI / 6)); ctx.lineTo(this.toX - headlen * Math.cos(angle + Math.PI / 6), this.toY - headlen * Math.sin(angle + Math.PI / 6)); ctx.fillStyle = this.color; ctx.fill(); } }
Next, we need to write the function that generates the business process diagram. In this function, we need to first create a new canvas element and insert it into the html page. Next, we need to generate rectangles and arrows and store them in an array for subsequent redrawing of the flowchart.
function generateWorkflow() { var canvas = document.createElement('canvas'); canvas.id = "workflow-canvas"; canvas.width = 800; canvas.height = 600; document.getElementById('workflow').appendChild(canvas); var rect1 = new Rectangle(80, 50, 120, 50, "#007bff", "发起申请"); var rect2 = new Rectangle(400, 50, 120, 50, "#ffc107", "待审核"); var rect3 = new Rectangle(80, 200, 120, 50, "#28a745", "审核通过"); var rect4 = new Rectangle(400, 200, 120, 50, "#dc3545", "审核拒绝"); var arrow1 = new Arrow(200, 75, 400, 75, "#007bff"); var arrow2 = new Arrow(520, 75, 680, 75, "#ffc107"); var arrow3 = new Arrow(200, 225, 400, 225, "#28a745"); var arrow4 = new Arrow(520, 225, 680, 225, "#dc3545"); var rects = [rect1, rect2, rect3, rect4]; var arrows = [arrow1, arrow2, arrow3, arrow4]; for (var i = 0; i <ol start="3"><li>Running results</li></ol><p>After completing the above steps, we only need to call the function that generates the business flow chart in the initialization function to display the business process in the html web page picture. </p><pre class="brush:php;toolbar:false">window.onload = function() { generateWorkflow(); }
When we run this javascript code, we can see the complete business flow chart on the web page. Through simple javascript code, we implemented a flow chart to make the web page more vivid and easy to understand.
Summary
This article introduces how to use pure javascript to implement an html business flow chart. We used the canvas element to draw rectangles and arrows, and generated the business process diagram through javascript code. Compared with traditional drawing tools, this method is more maintainable and convenient. With the help of JavaScript and other front-end technologies, we can complete various practical functions in web development more efficiently.
The above is the detailed content of How to implement html business process diagram using pure javascript. For more information, please follow other related articles on the PHP Chinese website!

TonavigateReact'scomplexecosystemeffectively,understandthetoolsandlibraries,recognizetheirstrengthsandweaknesses,andintegratethemtoenhancedevelopment.StartwithcoreReactconceptsanduseState,thengraduallyintroducemorecomplexsolutionslikeReduxorMobXasnee

Reactuseskeystoefficientlyidentifylistitemsbyprovidingastableidentitytoeachelement.1)KeysallowReacttotrackchangesinlistswithoutre-renderingtheentirelist.2)Chooseuniqueandstablekeys,avoidingarrayindices.3)Correctkeyusagesignificantlyimprovesperformanc

KeysinReactarecrucialforoptimizingtherenderingprocessandmanagingdynamiclistseffectively.Tospotandfixkey-relatedissues:1)Adduniquekeystolistitemstoavoidwarningsandperformanceissues,2)Useuniqueidentifiersfromdatainsteadofindicesforstablekeys,3)Ensureke

React's one-way data binding ensures that data flows from the parent component to the child component. 1) The data flows to a single, and the changes in the state of the parent component can be passed to the child component, but the child component cannot directly affect the state of the parent component. 2) This method improves the predictability of data flows and simplifies debugging and testing. 3) By using controlled components and context, user interaction and inter-component communication can be handled while maintaining a one-way data stream.

KeysinReactarecrucialforefficientDOMupdatesandreconciliation.1)Choosestable,unique,andmeaningfulkeys,likeitemIDs.2)Fornestedlists,useuniquekeysateachlevel.3)Avoidusingarrayindicesorgeneratingkeysdynamicallytopreventperformanceissues.

useState()iscrucialforoptimizingReactappperformanceduetoitsimpactonre-rendersandupdates.Tooptimize:1)UseuseCallbacktomemoizefunctionsandpreventunnecessaryre-renders.2)EmployuseMemoforcachingexpensivecomputations.3)Breakstateintosmallervariablesformor

Use Context and useState to share states because they simplify state management in large React applications. 1) Reduce propdrilling, 2) The code is clearer, 3) It is easier to manage global state. However, pay attention to performance overhead and debugging complexity. The rational use of Context and optimization technology can improve the efficiency and maintainability of the application.

Using incorrect keys can cause performance issues and unexpected behavior in React applications. 1) The key is a unique identifier of the list item, helping React update the virtual DOM efficiently. 2) Using the same or non-unique key will cause list items to be reordered and component states to be lost. 3) Using stable and unique identifiers as keys can optimize performance and avoid full re-rendering. 4) Use tools such as ESLint to verify the correctness of the key. Proper use of keys ensures efficient and reliable React applications.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

WebStorm Mac version
Useful JavaScript development tools

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

Atom editor mac version download
The most popular open source editor

Dreamweaver CS6
Visual web development tools
