Category: JavaScript Answers

Sometimes, we want to fix TypeError: moment().tz is not a function with JavaScript.

In this article, we’ll look at how to fix TypeError: moment().tz is not a function with JavaScript.

How to fix TypeError: moment().tz is not a function with JavaScript?

To fix TypeError: moment().tz is not a function with JavaScript, we should make sure that we’re importing moment-timezone before referencing tz.

We install moment-timezone by running

npm install moment-timezone --save

Then, we write

const moment = require('moment-timezone');

to import the moment-timezone module in our code.

Conclusion

To fix TypeError: moment().tz is not a function with JavaScript, we should make sure that we’re importing moment-timezone before referencing tz.

Sometimes, we want to wait for page load after form submit with Puppeteer and JavaScript.

In this article, we’ll look at how to wait for page load after form submit with Puppeteer and JavaScript.

How to wait for page load after form submit with Puppeteer and JavaScript?

To wait for page load after form submit with Puppeteer and JavaScript, we can use the waitForNavigation method.

For instance, we write

await page.waitForNavigation();

in our script to call the page.waitForNavigation method to wait for the page to load after submitting a form.

Conclusion

To wait for page load after form submit with Puppeteer and JavaScript, we can use the waitForNavigation method.

Sometimes, we want to hide points in Chart.js line graph with JavaScript.

In this article, we’ll look at how to hide points in Chart.js line graph with JavaScript.

How to hide points in Chart.js line graph with JavaScript?

To hide points in Chart.js line graph with JavaScript,. we can set the pointRadius option to 0.

For instance, we write

const myChart = new Chart(ctx, {
  type: "line",
  data: {
    labels: [
      //...
    ],
    datasets: [
      {
        data: [
          //...
        ],
        pointRadius: 0,
      },
    ],
  },
  options: {},
});

to create a new chart with the Chart constructor.

We call it with an object that has the pointRadius property set to 0 in the object in the datasets array.

As a result, the points on the line graph will be hidden.

Conclusion

To hide points in Chart.js line graph with JavaScript,. we can set the pointRadius option to 0.

Sometimes, we want to retrieve all localStorage items without knowing the keys in advance with JavaScript.

In this article, we’ll look at how to retrieve all localStorage items without knowing the keys in advance with JavaScript.

How to retrieve all localStorage items without knowing the keys in advance with JavaScript?

To retrieve all localStorage items without knowing the keys in advance with JavaScript, we can make a copy of the localStorage object.

For instance, we write

const items = { ...localStorage };

to use the spread operator with localStorage to make a shallow copy of the localStorage object and assign it to items.

Conclusion

To retrieve all localStorage items without knowing the keys in advance with JavaScript, we can make a copy of the localStorage object.

Sometimes, we want to display only 10 characters of a long string with JavaScript.

In this article, we’ll look at how to display only 10 characters of a long string with JavaScript.

How to display only 10 characters of a long string with JavaScript?

To display only 10 characters of a long string with JavaScript, we can use the string slice method.

For instance, we write

const example = "I am too long string";
const result = example.slice(0, 10) + "...";

to call example.slice with 0 and 10 to return a string with the first 10 characters in example.

Then we add the '...' string after than and assign the combined string to result.

Conclusion

To display only 10 characters of a long string with JavaScript, we can use the string slice method.