![]() We commit to keeping the breaking changes minimal so you can upgrade react-scripts painlessly. In most cases bumping the react-scripts version in package.json and running npm install in this folder should be enough, but it’s good to consult the changelog for potential breaking changes. To update an existing project to a new version of react-scripts, open the changelog, find the version you’re currently on (check package.json in this folder if you’re not sure), and apply the migration instructions for the newer versions. When you run create-react-app, it always creates the project with the latest version of react-scripts so you’ll get all the new features and improvements in newly created apps automatically. ![]() You almost never need to update create-react-app itself: it delegates all the setup to react-scripts. react-scripts is a development dependency in the generated projects (including this one). ![]() create-react-app is a global command-line utility that you use to create new projects.Injecting Data from the Server into the PageĬreate React App is divided into two packages:."Invalid Host Header" Errors After Configuring Proxy.Adding Development Environment Variables In.Adding Temporary Environment Variables In Your Shell.Referencing Environment Variables in the HTML.Adding Assets Outside of the Module System.Adding a CSS Preprocessor (Sass, Less etc.).Supported Language Features and Polyfills.You can find the most recent version of this guide here. Qs("body").This project was bootstrapped with Create React App.īelow you will find some information on how to perform common tasks. Here is my CSS code also, if you need it: article, aside, figure, footer, header, main, nav, section Įl.nextElementSibling.innerText=(v?'='+v.toFixed(2):v) add js code here to handler click event, and make the height input box be focused after the page is opened in web browserĭocument.getElementById('calculate').onclick = processEntries If (isNaN(height)||height =18.5 & outputBMI=25 & outputBMI30) document.getElementById("result").value = "Overweight" step1.2:get weight input and convert weight to a number step1.1:get height input and convert height to a number /get user input from input box "boxHeight" by using value property, Var outputBMI = document.querySelectorAll("div.results") Ĭonsole.log(heightInputBox.getAttribute('class')) Var weightInputBox = document.getElementById("boxWeight") Var heightInputBox = document.getElementById("boxHeight") How may I fix these problems please? I have attached both my HTML and my CSS codes below. I would like to show the error (that tells user to enter positive values, not missing or negative values) as messages below the "Calculate BMI" button, not as an alert like "This page says - Invalid input for weight, enter a non-negative number." In other words, I would like to keep the same message but not using "alert" method. If BMI = 18.5 and 25 and 30 then overweight. I can get the program to show the BMI result, but currently I don't know how to write to get the program to show whether the user is underweight, normal, obese, or overweight. Enter a positive number.", and it will highlight the boxes that you need to fix/enter a valid value. In case you enter a non-positive value for either height or weight, the program will show you an error message that "Invalid input. The application will calculate your BMI, then tell you whether you are underweight, normal, obese, or overweight. You just enter your height in inches and enter weight in pounds. Basically, here is how I'd like the application to work and wrote below so far: I have created an application to calculate BMI.
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