Web developer specializing in React, Vue, and front end development.
Sometimes, we want to define a JavaScript regex for special characters.
In tis article, we’ll look at how to define a JavaScript regex for special characters.
To define a JavaScript regex for special characters, we use the \W pattern.
For instance, we write
const regex = /\W|_/g;
to use the \W pattern to match all non-word characters.
To define a JavaScript regex for special characters, we use the \W pattern.
Sometimes, we want to reload current page with Angular.
In this article, we’ll look at how to reload current page with Angular.
To reload current page with Angular, we call navigateByUrl and navigate.
For instance, we write
await this.router.navigateByUrl("", { skipLocationChange: true });
this.router.navigate(["/launchpad"]);
to call navigateByUrl and navigate to reload the /launchpad page.
this.router is a Router instance.
To reload current page with Angular, we call navigateByUrl and navigate.
Sometimes, we want to set static image src in Vue.js template with JavaScript.
In this article, we’ll look at how to set static image src in Vue.js template with JavaScript.
To set static image src in Vue.js template with JavaScript, we set the path relative to the src folder.
For instance, we write
<template>
<img src="/static/img/clear.gif" />
</template>
to add an img element with src set to a path relative to the src folder to load the image.
To set static image src in Vue.js template with JavaScript, we set the path relative to the src folder.
To count text area characters with JavaScript, we use the value property.
For instance, we write
document.getElementById("textarea").onkeyup = (e) => {
console.log(e.target.value.length);
};
to select the text area with getElementById.
And then we set its onkeyup property to a function that logs the number of characters entered into the text area.
e.target.value has the input value string.
length has the number of characters.
To find, modify, and save with Mongoose and JavaScript, we call findOne and save.
For instance, we write
User.findOne({ username: oldUsername }, (err, user) => {
user.username = newUser.username;
user.password = newUser.password;
user.rights = newUser.rights;
user.save((err) => {
if (err) {
console.error("ERROR!");
}
});
});
to call findOne to find the object with the username set to oldUsername.
In the callback, we set the property values for user.
And then we call user.save to save the values.