I'm having trouble getting my code below to work properly. I'm not sure if the problem lies in the match function syntax or the regex itself. Any assistance would be greatly appreciated.
$scope.fileSelected = function (file) {
var valid = "/^[0-9a-zA-Z]+$/";
if (file.name.match(!valid)) {
alert("The file name contains characters that are not allowed (#, &, %, etc.)");
}
}
Solution:
Your issue lies in the placement of the exclamation mark. Consider modifying your code like this:
if (!file.name.match(valid)){
Insight:
The exclamation mark negates the value, providing the opposite boolean outcome. Essentially, it converts "truthy" to false, and "falsy" to true.
Understanding truthy/falsy is fundamental in various programming languages. Check out more details here: https://developer.mozilla.org/en-US/docs/Glossary/Truthy
Your variable valid represents a RegEx object, which always evaluates as truthy. As a result, !valid will consistently return false.
The original code interpretation implies:
If the file's name matches "false"
To convey the intended logic, adjust the expression to signify:
If it is not true that "the file's name matches this RegEx"
I am having difficulty connecting the angular controller 'pointofsaleController' to a view (index.cshtml). Can someone assist me in identifying my mistake? This is in an MVC project created using visual studio. pointofsaleController.js (func ...
/** * A function to determine the cost of an employee from a specific data file * @param {string} filePath - the path to the employee data file * @returns {{name: string, cost: number}} - the name and cost of the employee */ function calculateEmployee ...
As a newcomer to the world of JavaScript, I am facing a particular challenge. My goal is to add a conditional statement in my code that will only execute on screen sizes larger than 768px. $(window).on('scroll', function () { if ($(window ...
Does anyone know where I can locate the locally installed npm modules when using NodeJS version 10? I have checked under C:\Users\MyUser\AppData\Roaming, but I cannot find the "npm" folder. ...
When I make an AJAX request to fetch JavaScript wrapped in <script> tags that needs to be inserted on the current page, how can I ensure that the code executes upon insertion? Here's the snippet I'm using to add the code: function display ...
Within my controller, I currently have an object structured as follows: $scope.colors = { green: "Green", yellow: "Yellow", red: "Red" }; I am attempting to dynamically generate radio inputs and then link the input value to the corresponding ...
I'm facing an issue with fetching data from an API in a separate AngularJS application. There's a button that triggers the retrieval of data from the API. Upon clicking, it executes the $scope.getApiData function, which is connected to $scope.pr ...
Why is my footer not fading in after 1000px like I want it to? Instead, it appears immediately on the screen. I attempted using fadeIn() in jQuery but had no luck. I also tried to make it disappear with fadeOut(), again with no success. Am I missing someth ...
I need to retrieve all objects that have a specific 'id' within a nested array. Specifically, I want to find all person objects with hobbies id of 2 (hiking) in the provided sample data. This inquiry tackles the challenge of extracting all value ...
Is there a way to adjust the spacing between these borders? I've tried using border-spacing but it doesn't seem to be working. {{#each spacing}} <span class='space'> {{business}} ({{Count}}) </span> {{/each}} CSS .spac ...
I am facing an issue in PHP where strings retrieved from a database, which are URLs, appear to have strange characters at the end. When the URL is viewed in a browser's address bar, a string '%E2%80%8E' get attached to the URL causing it to ...
I'm restructuring the folder layout for my discord.js bot. To add more organization, I created a "src" folder to hold all js files. However, I'm facing an issue when trying to use readFileSync on a json file that is outside the src folder. Let&ap ...
Before checking out the following code snippet, I have a requirement. Whenever a specific checkbox (identified by id cfc1) is clicked, it should not show as checked. I have implemented the onCheck function for this purpose, but I'm struggling to fig ...
I'm working on a Vue.js v3 project using the composition API. I have defined a variable in my setup like this: setup() { const showInvoiceItemForm = true; return { showInvoiceItemForm }; }, Now, I want to show a form when a button is click ...
While utilizing ons-navigator, I am looking to customize the function of a particular element at a certain stage. Employing the onClick handler has allowed me to successfully trigger this function. However, upon exiting the onClick handler, the navigator ...
I have a set of data that looks like this: { name: "Acme co." add4: "", nationalNumber: "+13412768376" }, { name: "Acme Inc.", add4: "6345", nationalNumber: "" } My goal is to insert these records into a collection, but only if they are uni ...
While working with TypeScript and the fs/promises API, I encountered an error when compiling and running the TypeScript code. The error message displayed: internal/modules/cjs/loader.js:968 throw err; ^ Error: Cannot find module 'fs/promises' ...
I have a specific requirement for an animation. When the button is clicked, I need the element to transition from 0 opacity to full 1 opacity within 300 milliseconds. The issue I am facing is that when the button is clicked, the animation does not work a ...
I have been working on building a single-page application (SPA) using JavaScript and jQuery. During the process, I encountered an issue with a dynamic form. The user is able to add specific fields as needed, but if they don't generate and utilize all ...
Looking to retrieve the latest 8 products based on their date? Take a look at the code snippet below: const newestProducts= []; axios.get("http://localhost:3003/products").then(response => { let products = response.data.sort(fu ...