Author: John Au-Yeung

To add an InfoWindow to each marker with Google Maps API v3 and JavaScript, we call info.open.

For instance, we write

const marker = new google.maps.Marker({
  map,
  position: point,
  clickable: true,
});

marker.info = new google.maps.InfoWindow({
  content: "<b>Speed:</b> " + values.inst + " knots",
});

google.maps.event.addListener(marker, "click", () => {
  marker.info.open(map, marker);
});

set the marker.info property to an info window.

Then we call marker.info.open to open the info window when we click on the marker with addListener.

Sometimes, we want to remove square brackets in string using regex with JavaScript.

In this article, we’ll look at how to remove square brackets in string using regex with JavaScript.

How to remove square brackets in string using regex with JavaScript?

To remove square brackets in string using regex with JavaScript, we call the string replace method.

For instance, we write

console.log("['abc','xyz']".replace(/[\[\]']+/g, ""));

to call replace with a regex that matches opening and closing square brackets with \[ and \].

We use the g flag to replace all matches with empty strings.

The string with the replacements done is returned.

Conclusion

To remove square brackets in string using regex with JavaScript, we call the string replace method.

Sometimes, we want to send a https request to a rest service in Node.js and JavaScript.

In this article, we’ll look at how to send a https request to a rest service in Node.js and JavaScript.

How to send a https request to a rest service in Node.js and JavaScript?

To send a https request to a rest service in Node.js and JavaScript, we use the https module.

For instance, we write

const https = require("https");

const options = {
  host: "www.example.com",
  port: 443,
  path: "/upload",
  method: "POST",
};

const req = https.request(options, (res) => {
  console.log("STATUS: ", res.statusCode);
  console.log("HEADERS: ", JSON.stringify(res.headers));
  res.setEncoding("utf8");
  res.on("data", (chunk) => {
    console.log("BODY: ", chunk);
  });
});

req.on("error", (e) => {
  console.log("problem with request: ", e.message);
});

to call https.request with the options object, which includes the URL, port, and the request method.

Then we get the response statusCode, headers, and the response body chunk in the request callback.

We listen for errors by calling req.on with 'error' and a error handler callback.

Conclusion

To send a https request to a rest service in Node.js and JavaScript, we use the https module.

Sometimes, we want to add content to HTML body using JavaScript.

In this article, we’ll look at how to add content to HTML body using JavaScript.

How to add content to HTML body using JavaScript?

To add content to HTML body using JavaScript, we call the insertAdjacentHTML method.

For instance, we write

document
  .getElementById("container")
  .insertAdjacentHTML("beforeend", '<div id="idChild"> content html </div>');

to select the element with getElementByid.

Then we call insertAdjacentHTML to insert HTML as the last child of the element with ID container.

Conclusion

To add content to HTML body using JavaScript, we call the insertAdjacentHTML method.

Sometimes, we want to define regular expression for number with length of 4, 5 or 6 with JavaScript.

In this article, we’ll look at how to define regular expression for number with length of 4, 5 or 6 with JavaScript.

How to define regular expression for number with length of 4, 5 or 6 with JavaScript?

To define regular expression for number with length of 4, 5 or 6 with JavaScript, we use the \d pattern.

For instance, we write

const re = /\d{4,6}/;

to define the re regex that matches strings with 4 to 6 digits.

\d matches digits.

And {4,6} matches digit groups with length between 4 and 6.

Conclusion

To define regular expression for number with length of 4, 5 or 6 with JavaScript, we use the \d pattern.