Category: JavaScript

Sometimes, we want to determine if a checkbox is checked with JavaScript.

In this article, we’ll look at how to determine if a checkbox is checked with JavaScript.

How to determine if a checkbox is checked with JavaScript?

To determine if a checkbox is checked with JavaScript, we use the checked property.

For instance, we write

<label><input id="lifecheck" type="checkbox" />Lives</label>

to add a checkbox.

Then we write

const checked = document.getElementById("lifecheck").checked;

to select the checkbox with getElementById.

And then we check if it’s checked with the checked property.

Conclusion

To determine if a checkbox is checked with JavaScript, we use the checked property.

Sometimes, we want to split array into two arrays with JavaScript.

In this article, we’ll look at how to split array into two arrays with JavaScript.

How to split array into two arrays with JavaScript?

To split array into two arrays with JavaScript, we can use the array slice method.

For instance, we write

const arr = ["a", "b", "c", "d", "e", "f"];

const indexToSplit = arr.indexOf("c");
const first = arr.slice(0, indexToSplit);
const second = arr.slice(indexToSplit + 1);

to call indexOf to get the index of 'c'.

Then we call slice with 0 and indexToSplit to return an array with arr entries from index 0 to indexToSplit - 1.

Next we call slice again with indexToSplit + 1 to return an array from index indexToSplit + 1 to the end of the arr array.

Conclusion

To split array into two arrays with JavaScript, we can use the array slice method.

Sometimes, we want to make HTML form submit do nothing with JavaScript.

In this article, we’ll look at how to make HTML form submit do nothing with JavaScript.

How to make HTML form submit do nothing with JavaScript?

To make HTML form submit do nothing with JavaScript, we return false in the submit handler.

For instance, we write

<form onsubmit="return false;">
  <input type="submit" value="Submit" />
</form>

to set the onsubmit attribute to return false; to stop form submission when we click on the submit button.

Conclusion

To make HTML form submit do nothing with JavaScript, we return false in the submit handler.

Sometimes, we want to get LatLng from zip code with Google Maps API.

In this article, we’ll look at how to get LatLng from zip code with Google Maps API.

How to get LatLng from zip code with Google Maps API?

To get LatLng from zip code with Google Maps API, we can use an endpoint to get the latlng from the zip code.

For instance, we make a get request to

https://maps.googleapis.com/maps/api/geocode/json?key=YOUR_API_KEY&components=postal_code:97403

to get get the latlng data from the 97403 zip code.

An API key is required to make this request.

Conclusion

To get LatLng from zip code with Google Maps API, we can use an endpoint to get the latlng from the zip code.

Sometimes, we want to get the background color code of an element in hex with JavaScript.

In this article, we’ll look at how to get the background color code of an element in hex with JavaScript.

How to get the background color code of an element in hex with JavaScript?

To get the background color code of an element in hex with JavaScript, we can set the strokeStyle property of the canvas and then retrieve the value.

For instance, we write

const ctx = document.createElement("canvas").getContext("2d");
ctx.strokeStyle = "rgb(64, 128, 192)";
const hexColor = ctx.strokeStyle;

to create a canvas with createElement.

Then we get its context with getContext.

Next, we set strokeStyle to a color string.

And then we get the hex color value with ctx.strokeStyle.

Conclusion

To get the background color code of an element in hex with JavaScript, we can set the strokeStyle property of the canvas and then retrieve the value.