Today I encountered a rather peculiar issue that I would like to share here:
I noticed that when using v-for and v-if together with data value of [], it doesn't seem to work. For example:
ts: []
<div v-for="t in ts" :key="t" v-if="ts.length">
Yes
</div>
<div v-else>
No
</div>
You can check out the problem in action on codesandbox.
As seen, nothing gets rendered and no errors are thrown. I even attempted using v-if="ts.length > 0" but had no luck.
Avoid using v-for in combination with v-if as it is not recommended. For more information, refer to the official documentation: https://v2.vuejs.org/v2/guide/conditional.html#v-if-with-v-for
Here's a potential solution: You can separate v-if from v-for by structuring your code in the following way:
<div v-if="ts.length">
<div v-for="t in ts" :key="t">
Yes
</div>
</div>
<div v-else>
No
</div>
However, this approach may not be ideal for everyone. Some may find it satisfactory while others may not. Personally, I feel that it is not the best solution because I prefer to have v-for and v-if together without separating them. This way, I can keep all related components within the same table's tr element.
It is worth noting that the Vue.js documentation explicitly advises against using v-if and v-for on the same element.
When using the navigator.useragent request, I am able to gather information about all browsers or webkits. However, I am having trouble distinguishing between a webapp (iOS desktop bookmark) and a native app iOS webkit as they both provide the same info ...
I am utilizing an HTML5 input control that allows users to upload a .csv file: <input id="ImportFile" type="file" name="ImportFile" data-val="true" data-val-required="Please select a file" title="Browse for a file to upload" /> This input control i ...
My code includes a progress bar that works fine - it shows a movable progress bar when the window is scrolled. However, I want the progress bar to move when scrolling inside my div, not on the entire window. I am currently using jQuery for this functionali ...
I've created a function to prevent the rotation of a three.js object when the mouse hovers over it. function onDocumentMouseUp( event ) { event.preventDefault(); mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1; mouse.y = - ( event.clientY / w ...
class Headers extends React.Component { render() { const selected = this.props.selectedTab; const headers = this.props.tabItems.map((tab, index) => { const title = tab.title; const styling = index === selected ? 'active' ...
I have created a project similar to a "ToDo" list, but instead of tasks, it's a list of names. I can input a name and add it to the array, as well as delete each item. Now, I want to implement a button that randomly selects one of the names in the ar ...
After using JSON.stringify() on an array in JavaScript, the resulting data appears as follows: [ { "typeOfLoan":"Home" }, { "typeOfResidency":"Primary" }, { "downPayment":"5%" }, { "stage":"Just Looki ...
I am trying to send a post request to the path /users and then right away send another post request to /users/:id. However, I need the actions to be different for each of these URLs, so I cannot use the array method to apply the same middleware. The goal ...
Hello, I am currently in the process of learning React JS and there are two JavaScript files that I am working on: Polyfill.js -> hosted on github CustomNavbar.js -> created by me Here is the structure of polyfill.js: export default (function(win ...
I have encountered an issue with a sample webpage where I am attempting to set the wmode of all YouTube elements on the page to "transparent." When inspecting the page using Chrome, I can see that my JavaScript code is functioning properly. However, the b ...
My website has a user account creation form with a "submit" button that is actually an html type='button', not a true submit button. When this button is clicked, I rely on jQuery to call ('#form').submit(); in order to submit the form. ...
I'm having trouble updating the current upload value on my progress bar in real-time. I know how to do it when the progress bar has stopped, but I can't get it to update continuously. xhr.upload.onprogress = function(e) { if (e.lengthComputa ...
I recently designed a basic scene in three.js, however I am facing an issue where it does not seem to work with the canvas renderer, even though it should work correctly. Here is the code: http://jsfiddle.net/PRkcJ/ The scene only functions properly when ...
Is there a way to properly close an async connection once all data has been successfully entered? Despite attempting to end the connection outside of the loop, it seems that the structure is being finalized after the first INSERT operation CODE require( ...
I have a Angular list displayed in a table, and I need to insert an element at a specific position. I have tried using the following code: array.splice(index, 0, element); While everything seems fine in the console with the element being added at the corr ...
I am currently working on implementing user authentication and redirection logic based on the user's authentication status. For instance, if a logged-in user tries to access the login or signup page, they should be automatically redirected. To achieve ...
I'm looking for guidance on how to position my button divs over my Trapezoids in an overlay fashion. Currently, I have set up an array to store the colors and utilizing the map function to match each button with its corresponding color type. When a ...
How can I assign values to typeorm entities and insert them into the database? import { PricingPatternElement } from file const Element:PricingPatternElement = { displayOrder: 10, elementName: "test", createdAt : getCurrentDate(), createdBy: &qu ...
I am attempting to accomplish the following: https://i.sstatic.net/JffUWC02.png Essentially, I need a select options menu with labels where selecting an option will display a corresponding value. These values should then become labels for a second selec ...
I have 2 files, test.html <!DOCTYPE html> <head> <title>test</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script src="./test/jquery.min.js"></script> </head> <body> ...