Category: JavaScript Answers

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JavaScript Answers

How to fix .day() returns wrong day of month with Moment.js and JavaScript?

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Sometimes, we want to fix .day() returns wrong day of month with Moment.js and JavaScript.

In this article, we’ll look at how to fix .day() returns wrong day of month with Moment.js and JavaScript.

How to fix .day() returns wrong day of month with Moment.js and JavaScript?

To fix .day() returns wrong day of month with Moment.js and JavaScript, we should use the date method instead of day.

For instance, we write

const today = moment().date();

to call date to return the day of the month of today.

Conclusion

To fix .day() returns wrong day of month with Moment.js and JavaScript, we should use the date method instead of day.

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How to override nested property with JavaScript Object.assign?

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Sometimes, we want to override nested property with JavaScript Object.assign.

In this article, we’ll look at how to override nested property with JavaScript Object.assign.

How to override nested property with JavaScript Object.assign?

To override nested property with JavaScript Object.assign, we can use the spread operator.

For instance, we write

const b = Object.assign({}, a, {
  user: {
    ...a.user,
    groups: "some changed value",
  },
});

to call Object.assign with an empty object a, and a new object with the properties that override a‘s properties to return object b with the overridden nested propeties.

Conclusion

To override nested property with JavaScript Object.assign, we can use the spread operator.

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How to add a Google Maps Autocomplete search box with JavaScript?

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Sometimes, we want to add a Google Maps Autocomplete search box with JavaScript.

In this article, we’ll look at how to add a Google Maps Autocomplete search box with JavaScript.

How to add a Google Maps Autocomplete search box with JavaScript?

To add a Google Maps Autocomplete search box with JavaScript, we can add an input.

For instance, we write

<head>
  ...
  <script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false&libraries=places"></script>
  ...
</head>
<body>
  ...
  <input id="searchTextField" type="text" size="50" />
  ...
</body>

to add the Google Maps script and search input.

Then we write

const initialize = () => {
  const input = document.getElementById("searchTextField");
  new google.maps.places.Autocomplete(input);
};

google.maps.event.addDomListener(window, "load", initialize);

to select the input with getElementById in the initialize function.

Then we call the Autocomplete constructor with input to convert it to a Google Maps search input.

Then we call addDomListener with window, 'load', and initialize to call initialize when the DOM loads.

Conclusion

To add a Google Maps Autocomplete search box with JavaScript, we can add an input.

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How to programmatically click on an element in JavaScript?

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Sometimes, we want to programmatically click on an element in JavaScript.

In this article, we’ll look at how to programmatically click on an element in JavaScript.

How to programmatically click on an element in JavaScript?

To programmatically click on an element in JavaScript, we can create a mouse event object and call dispatchEvent.

For instance, we write

const clickEvent = new MouseEvent("click", {
  view: window,
  bubbles: true,
  cancelable: false,
});
element.dispatchEvent(clickEvent);

to create the MouseEvent object that does a click.

We set the bubbles option to true to make it propagate to the parent.

cancelable set to false means it’s not cancelable.

Then we call element.dispatchEvent with clickEvent to trigger a click event on the HTML element.

Conclusion

To programmatically click on an element in JavaScript, we can create a mouse event object and call dispatchEvent.

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How to encode a JavaScript object as JSON?

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Sometimes, we want to encode a JavaScript object as JSON.

In this article, we’ll look at how to encode a JavaScript object as JSON.

How to encode a JavaScript object as JSON?

To encode a JavaScript object as JSON, we use the JSON.stringify method.

For instance, we write

const json = JSON.stringify(values);

to call JSON.stringify with values to return a JSON string converted from the value of values object.

Conclusion

To encode a JavaScript object as JSON, we use the JSON.stringify method.