Како да се препопулира полето за формулари со денешниот датум и JavaScript или JQuery
While many solutions offer the opportunity to store the date with each form entry, there are other times when it’s not an option. We encourage our clients to add a hidden field to their site and pass this information along with the entry so they can track when form entries are entered. Using JavaScript, this is easy.
How To Prepopulate A Form Field With Today’s Date and JavaScript
<!DOCTYPE html>
<html>
<head>
<title>Date Prepopulation with JavaScript</title>
</head>
<body>
<form>
<!-- Hidden field for the date -->
<input type="hidden" id="hiddenDateField" name="hiddenDateField">
</form>
<script>
// Function to get today's date in the desired format
function getFormattedDate() {
const today = new Date();
const formattedDate = today.toLocaleDateString('en-US', {
year: 'numeric',
month: '2-digit',
day: '2-digit'
});
return formattedDate;
}
// Use JavaScript to set the value of the hidden field to today's date
document.getElementById('hiddenDateField').value = getFormattedDate();
</script>
</body>
</html>
Let’s break down the provided HTML and JavaScript code step by step:
<!DOCTYPE html>
<html>
: These are standard HTML document declarations specifying that this is an HTML5 document.<head>
: This section is typically used to include metadata about the document, such as the title of the webpage, which is set using the<title>
елемент.<title>
: This sets the title of the webpage to “Date Prepopulation with JavaScript.”<body>
: This is the main content area of the webpage where you place the visible content and user interface elements.<form>
: A form element that can contain input fields. In this case, it’s used to contain the hidden input field that will be populated with today’s date.<input type="hidden" id="hiddenDateField" name="hiddenDateField">
: This is a hidden input field. It doesn’t appear on the page but can store data. It’s given an ID of “hiddenDateField” and a name of “hiddenDateField” for identification and use in JavaScript.<script>
: This is the opening tag for a JavaScript script block, where you can write JavaScript code.function getFormattedDate() { ... }
: This defines a JavaScript function calledgetFormattedDate()
. Inside this function:- It creates a new
Date
object representing the current date and time usingconst today = new Date();
. - It formats the date into a string with the desired format (mm/dd/yyyy) using
today.toLocaleDateString()
. на'en-US'
argument specifies the locale (American English) for formatting, and the object withyear
,month
, иday
properties defines the date format.
- It creates a new
return formattedDate;
: This line returns the formatted date as a string.document.getElementById('hiddenDateField').value = getFormattedDate();
: This line of code:- Користи
document.getElementById('hiddenDateField')
to select the hidden input field with the ID “hiddenDateField.” - Го поставува
value
property of the selected input field to the value returned by thegetFormattedDate()
function. This populates the hidden field with today’s date in the specified format.
- Користи
The end result is that when the page loads, the hidden input field with ID “hiddenDateField” is populated with today’s date in the format mm/dd/yyyy without leading zeroes, as specified in the getFormattedDate()
функција.
How To Prepopulate A Form Field With Today’s Date and jQuery
<!DOCTYPE html>
<html>
<head>
<title>Date Prepopulation with jQuery and JavaScript Date Object</title>
<!-- Include jQuery from a CDN -->
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
</head>
<body>
<form>
<!-- Hidden field for the date -->
<input type="hidden" id="hiddenDateField" name="hiddenDateField">
</form>
<script>
// Use jQuery to set the value of the hidden field to today's date
$(document).ready(function() {
const today = new Date();
const formattedDate = today.toLocaleDateString('en-US', {
year: 'numeric',
month: '2-digit',
day: '2-digit'
});
$('#hiddenDateField').val(formattedDate);
});
</script>
</body>
</html>
This HTML and JavaScript code demonstrates how to use jQuery to prepopulate a hidden input field with today’s date, formatted as mm/dd/yyyy, without leading zeroes. Let’s break it down step by step:
<!DOCTYPE html>
<html>
: These are standard HTML document declarations indicating that this is an HTML5 document.<head>
: This section is used for including metadata and resources for the webpage.<title>
: Sets the title of the webpage to “Date Prepopulation with jQuery and JavaScript Date Object.”<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
: This line includes the jQuery library by specifying its source from a content delivery network (CDN). It ensures that the jQuery library is available for use on the webpage.<body>
: This is the main content area of the webpage where you place the visible content and user interface elements.<form>
: An HTML form element used to contain input fields. In this case, it’s used to encapsulate the hidden input field.<input type="hidden" id="hiddenDateField" name="hiddenDateField">
: A hidden input field that won’t be visible on the webpage. It’s assigned an ID of “hiddenDateField” and a name of “hiddenDateField.”<script>
: This is the opening tag for a JavaScript script block where you can write JavaScript code.$(document).ready(function() { ... });
: This is a jQuery code block. It uses the$(document).ready()
function to ensure that the contained code runs after the page has fully loaded. Inside this function:const today = new Date();
creates a newDate
објект кој го претставува тековниот датум и време.const formattedDate = today.toLocaleDateString('en-US', { ... });
formats the date into a string with the desired format (mm/dd/yyyy) using thetoLocaleDateString
метод.
$('#hiddenDateField').val(formattedDate);
selects the hidden input field with the ID “hiddenDateField” using jQuery and sets itsvalue
to the formatted date. This effectively prepopulates the hidden field with today’s date in the specified format.
The jQuery code simplifies the process of selecting and modifying the hidden input field compared to pure JavaScript. When the page loads, the hidden input field is populated with today’s date in the mm/dd/yyyy format, and no leading zeroes are present, as specified in the formattedDate
променлива.