How to remove leading and trailing spaces in email and password field.

For email field :

onblur="this.value=this.value.trim()"

The onblur attribute is an event handler in HTML that is triggered when an element loses focus, typically after the user interacts with it and then clicks outside of it or tabs away from it. In the example you provided, onblur=”this.value=this.value.trim()”, the JavaScript code is executed when the element loses focus.

Let’s break down the code:

onblur: It specifies that the associated code should be executed when the element loses focus.
this.value: It refers to the value of the current element. In this case, it is most likely used with an input element such as or .<br /> this.value.trim(): The trim() function is used to remove leading and trailing whitespace characters from the value of the element.<br /> So, when the element loses focus, the code this.value=this.value.trim() is executed, which trims any leading or trailing whitespace from the value entered by the user in the input field. This can be useful to ensure that any unnecessary spaces are removed from user input.</p>

For password field :

<script>
	const passwordInput = document.getElementById("login-password");

	passwordInput.addEventListener("blur", () => {
		const trimmedPassword = passwordInput.value.trim();

		if (trimmedPassword !== passwordInput.value) {
			passwordInput.value = "";
			passwordInput.focus();
		}
	});
</script>

The provided JavaScript code sets up an event listener for the “blur” event on an input field with the ID “login-password”.

Here’s a breakdown of the code:

This first line retrieves the element with the ID “login-password” from the HTML document and assigns it to the variable passwordInput.
The sencond line code attaches an event listener to the passwordInput element. The event being listened to is “blur”, which triggers when the input field loses focus (i.e., the user clicks outside of the field or tabs away from it).
Within the event listener, third line trims any leading and trailing whitespace from the value entered in the passwordInput field. The trimmed password is stored in the trimmedPassword variable.
In If condition checks if the trimmed password is different from the original value of the passwordInput field. If there were leading or trailing whitespace characters in the original value, the condition will be true. In that case, the value of the passwordInput field is set to an empty string (“”), effectively clearing the field. Additionally, the focus() method is called on the input field, bringing the focus back to it so that the user can enter a valid password without leading or trailing whitespace.

Summary, this code ensures that if the user enters a password with leading or trailing whitespace, it will be automatically trimmed, and the input field will be cleared and refocused to prompt the user to enter a valid password.