How to pass key as select option value in v-for when changed (VueJS)

I'm using Vue3 and Bootstrap5. I have a select with multiple options. Now I am displaying my option.TEXT and when I change something this value will also be passed into my method. But when I change something, I want to pass key(option.ID). But I also want my v-model to be my option.ID but show my op...

P粉916553895 2023-11-17 08:55:24 0 1 276

What are the performance numbers next to components in the Vue dev tools?

Does anyone have insights or resources for a certain feature in the Vue development tools? On the components pane, it shows my component, and then these little red and yellow squares, and what I'm assuming is the performance of the component. When I first load the app they don't appear, but for exam...

P粉420868294 2023-11-09 14:46:48 0 1 305

MySQL syntax for updating specific key/value pairs in JSON array

I have a table in a MySQL5.7.12 database with a JSON column. The data in the column has the following structure (the json array may contain multiple json objects): [{"ste":"I","tpe":"PS"},{"ste":"I","tpe": "PB"}]I want t...

P粉386318086 2023-11-06 14:50:43 0 1 269

"Using the v-for directive for array element and attribute destructuring"

When using an array of objects, is it possible in a v-for loop to simultaneously assign the current object to a variable and destructure its properties? Like this: Eventually I want to be able to use both the entire person object and its...

P粉420958692 2023-11-05 17:37:54 0 1 216

Vue 3 composition api - computed property returns undefined

Using the Vue3 composition API, how to return the calculated value of the property firstDigit? The keyword this in the computed property is undefined but when I exclude this I get the error fourDigitsisnotDefined. import{computed,reactive}from'vue'consstinput=reactive({fourDigits:...

P粉662089521 2023-10-31 19:00:10 0 2 197

Sorting HTML tables: a step-by-step guide

I'm not an HTML expert at all. I programmed the microcontroller and started going off on tangents. I have created an html document to display a table of microcontroller registers, register addresses and register descriptions. I have created a table with 3 columns and about 120 rows. Some register ad...

P粉023326773 2023-10-31 16:45:43 0 1 223

Find the object corresponding to the key value in MySQL JSON: How to implement it

I'm trying to find a way to search a JSON object and get a specific key, but search for another key. Here is a sample schema: CREATETABLE`fields`(`id`int(10)unsignedNOTNULLAUTO_INCREMENT,`label`varchar(64)COLLATEutf8mb4_unicode_ciNOTNULL,`options`jsonDEFAULTNULL,PRIMARYKEY(`id`))EN

P粉037215587 2023-10-30 13:42:27 0 1 331

Get the calculated value of a CSS variable using a calc-like expression

In JavaScript, you can get the value of a CSS variable using getPropertyValue(property). This function is useful for retrieving variables declared in :root blocks. :root{--example-var:50px;} However, if this variable expression contains a calc-like function, the getPropertyValue call will return the...

P粉111627787 2023-10-25 09:39:36 1 2 521

Learn about CSRF

I don't see how using a "challenge token" adds any kind of prevention: what value should be compared to what? From OWASP: Generally speaking, developers only need to generate this token once for the current session. After initial generation of this token, its value is stored in the session...

P粉056618053 2023-10-23 13:57:29 0 2 218

Using Array objects as keys in ES6 Map

I'm trying to update my code to ES6 as I'm using Node4.0 and really like its features so far. However, I have a problem with the new ES6Map data structure because it behaves differently than {} when using Array as key. I use it as a counter map. I run this code and I want to know how to use an array...

P粉344355715 2023-10-21 18:06:40 0 2 277

Is there a way to retrieve specific "columns" from a PHP array?

I have an array of arrays with the following structure: array(array('page'=>'page1','name'=>'pagename1')array('page'=>'page2','name'=>'pagename2 ')array('page'=>'page3','name'=>'pagename3')) Is there a built-in function that returns a new array containing only the "name" ...

P粉423694341 2023-10-21 00:01:53 0 2 347

Access class constants using a simple variable containing the constant name

I'm trying to access a class constant in one of my classes: constMY_CONST="value"; If I have a variable to hold the name of this constant like this: $myVar="MY_CONST"; I can somehow access it What is the value of MY_CONST? self::$myVar This obviously doesn't work since it's for...

P粉691461301 2023-10-20 14:57:01 0 2 235

Modify textNode value

Is there any way to change the value of a DOMtextNode in a web browser? I specifically wanted to see if it was possible to change an existing node, rather than create a new one. To clarify, I need to use Javascript to accomplish this. All text in the browser is stored in #textNodes, which are childr...

P粉805535434 2023-10-17 20:55:25 0 2 261

How to sort arrays and data in PHP?

This question is intended as a reference regarding array sorting issues in PHP. It's easy to think that your particular case is unique and deserves a new question, but most are actually just minor variations on one of the solutions on this page. If your question was closed as a duplicate of this one...

P粉068174996 2023-10-17 15:33:51 0 2 214

How to update JSON data type column in MySQL 5.7.10?

I recently started using MySQL5.7.10 and I really like the native JSON data type. But I have a problem while updating JSON type value. Question: Below is the table format, here I want to add 1 key to the t1 table in the data column. Now I have to get the value modify it and update the table. So an a...

P粉512363233 2023-10-16 19:03:34 0 2 307

Custom key to sort flat association based on another array

Is it possible to do something like this in PHP? How would you write a function? Here is an example. Order is most important. $customer['address']='123fakest';$customer['name']='Tim';$customer['dob']='12/08/1986';$customer['dontSortMe']='thisvaluedoesntneedtobesorted ';I want to do something similar...

P粉541551230 2023-10-15 19:52:40 0 2 246

mysql update column with value from another table

I have two tables, both look like idnamevalue===================1Joe222Derk30 I need to copy the value of value from tableA to tableB based on the checked name in each table . Any tips for this UPDATE statement?

P粉232793765 2023-10-11 20:04:57 0 2 250

Is JavaScript a language that uses pass-by-reference or pass-by-value?

Primitive types (numbers, strings, etc.) are passed by value, but objects are unknown since they can all be passed by value (in this case, the variable we think holds the object is actually a reference to the object) and pass-by-reference (when we think of an object's variables as holding the object...

P粉002546490 2023-10-11 17:50:30 0 1 298

Looping PHP objects using dynamic keys: a step-by-step guide

I'm trying to parse a JSON file using PHP. But now I'm stuck. This is the content of my JSON file: {"John":{"status":"Wait"},"Jennifer":{"status":"Active"},"James":{"status":&quo

P粉312195700 2023-10-10 08:50:47 0 2 264

How to access and handle nested objects, arrays, or JSON?

I have a nested data structure containing objects and arrays. How to extract information, i.e. access specific or multiple values (or keys)? For example: vardata={code:42,items:[{id:1,name:'foo'},{id:2,name:'bar'}]}; How to access the name of the second item in items?

P粉864872812 2023-10-09 19:02:22 0 2 285