programming html Format decimal C#

How do you set decimal places in html?

I used @carpetofgreenness's answer in which you listen for input event instead of change as in the accepted one, but discovered that in any case deleting characters isn't handled properly.

Let's say we've got an input with the value of "0.25". The user hits "Backspace", the value turns into "0.20", and it appears impossible to delete any more characters, because "0" is always added at the end by the function.

To take care of that, I added a guard clause for when the user deletes a character:

if [e.inputType == "deleteContentBackward"] {
  return;
}

This fixes the bug, but there's still one extra thing to cover - now when the user hits "Backspace" the value "0.25" changes to "0.2", but we still need the two digits to be present in the input when we leave it. To do that we can listen for the blur event and attach the same callback to it.

I ended up with this solution:

const setTwoNumberDecimal = [el] => {
  el.value = parseFloat[el.value].toFixed[2];
};

const handleInput = [e] => {
  if [e.inputType == "deleteContentBackward"] {
    return;
  }
  setTwoNumberDecimal[e.target];
};

const handleBlur = [e] => {
  if [e.target.value !== ""] {
    setTwoNumberDecimal[e.target];
  }
};

myHTMLNumberInput.addEventListener["input", handleInput];
myHTMLNumberInput.addEventListener["blur", handleBlur];

Definition and Usage

The toFixed[] method converts a number to a string.

The toFixed[] method rounds the string to a specified number of decimals.

Note

If the number of decimals are higher than in the number, zeros are added.

Syntax

Parameters

Parameter	Description
x	Optional. Number of decimals. Default is 0 [no decimals]

Return Value

Type	Description
A string	The representation of a number with [or without] decimals.

More Examples

Browser Support

Number.constructor is an ECMAScript3 [ES3] feature.

ES3 [JavaScript 1999] is fully supported in all browsers:

Chrome	IE	Edge	Firefox	Safari	Opera
Yes	Yes	Yes	Yes	Yes	Yes

HTML input type number with decimal precision.

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	[function[]{
	// Input field given to n decimal places. Degrades gracefully to standard numeric input.
	// Usage:
	try {
	var proto = Object.create[HTMLInputElement.prototype];
	proto.createdCallback = function[] {
	this.type = "number";
	this.addEventListener["change", this.decimate];
	this.value = parseFloat[this.value].toFixed[this.getAttribute['data-places']];
	};
	proto.decimate = function[]{
	this.value = parseFloat[this.value].toFixed[this.getAttribute['data-places']];
	};
	document.registerElement["decimal-number", {
	prototype: proto,
	extends: 'input'
	}];
	} catch[e]{}
	}][];

How do you add decimal places in HTML?

Formatting Number to Two Decimal places.

const num = 123.1390..

// 1 decimal place..

console. log[+num. toFixed[1]]; // 123.1..

// 2 decimal places..

console. log[+num. toFixed[2]]; // 123.13..

How do I put 2 decimal places in HTML?

Use the toFixed[] method to format a number to 2 decimal places, e.g. num. toFixed[2] . The toFixed method takes a parameter, representing how many digits should appear after the decimal and returns the result.

How do I limit the number of decimal places in HTML?

To recap, you can use the . toFixed[] method to limit decimal places.

How do you set the number of decimal places?

Right-click on the selected cells and choose Format Cells options from the context menu. In the following dialog, select Number from the Category section. Type the required number in the box associated with Decimal places.