Category: JavaScript Answers

Sometimes, we want to remove seconds/ milliseconds from Date convert to ISO string with JavaScript.

In this article, we’ll look at how to remove seconds/ milliseconds from Date convert to ISO string with JavaScript.

How to remove seconds/ milliseconds from Date convert to ISO string with JavaScript?

To remove seconds/ milliseconds from Date convert to ISO string with JavaScript, we use the setSeconds method.

For instance, we write

const d = new Date();
d.setSeconds(0, 0);
console.log(d.toISOString());

to call setSeconds on date d to set its seconds and milliseconds to 0.

And then we call toISOString to return the ISO string from the date.

Conclusion

To remove seconds/ milliseconds from Date convert to ISO string with JavaScript, we use the setSeconds method.

Sometimes, we want to replace comma with a dot in the number with JavaScript.

In this article, we’ll look at how to replace comma with a dot in the number with JavaScript.

How to replace comma with a dot in the number with JavaScript?

To replace comma with a dot in the number with JavaScript, we use the replace method.

For instance, we write

const newStr = str.replace(/,/g, ".");

to call replace on string str to replace all commas with dots and return the new string.

We use /,/ to match a comma.

The g flag makes replace replace all matches.

Conclusion

To replace comma with a dot in the number with JavaScript, we use the replace method.

Sometimes, we want to do group by in Sequelize and JavaScript.

In this article, we’ll look at how to do group by in Sequelize and JavaScript.

How to do group by in Sequelize and JavaScript?

To do group by in Sequelize and JavaScript, we call findAll with an object that has the group property.

For instance, we write

const result = await Table.findAll({
  attributes: ["column1", sequelize.fn("count", sequelize.col("column2"))],
  group: ["Table.column1"],
});

to call Table.findAll with an object that has group= set to ["Table.column1"] to group by Table‘s column1.

Then we use await to get the returned result.

Conclusion

To do group by in Sequelize and JavaScript, we call findAll with an object that has the group property.

Sometimes, we want to change lowercase characters to uppercase using the keyup event with JavaScript.

In this article, we’ll look at how to change lowercase characters to uppercase using the keyup event with JavaScript.

How to change lowercase characters to uppercase using the keyup event with JavaScript?

To change lowercase characters to uppercase using the keyup event with JavaScript, we set the value to upper case with toUpperCase.

For instance, we write

const input = document.getElementById("inputID");

input.onkeyup = (e) => {
  e.target.value = e.target.value.toUpperCase();
};

to get the input with getElementById.

Then we set its onkeyup property to convert the input value to upper case with toUpperCase.

We then assign the returned string back to e.target.value to update the string.

Conclusion

To change lowercase characters to uppercase using the keyup event with JavaScript, we set the value to upper case with toUpperCase.

Sometimes, we want to remove attribute checked from checkbox with JavaScript.

In this article, we’ll look at how to remove attribute checked from checkbox with JavaScript.

How to remove attribute checked from checkbox with JavaScript?

To remove attribute checked from checkbox with JavaScript, we use the removeAttribute method.

For instance, we write

const audioCheckbox = document.getElementById("audioCheckbox");

audioCheckbox.removeAttribute("checked");

to get the checkbox with getElementById.

Then we call removeAttribute on the audioCheckbox to remove the 'checked' attribute.

Conclusion

To remove attribute checked from checkbox with JavaScript, we use the removeAttribute method.