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Get the value of the input for jQuery and JS

Get the value for jQuery

You must refer to the INPUT tag through id or name. Then use .val().

$("#id_login").val();
$("input[name='login']").val();

<INPUT id="id_login" name="login" value="Jony">

Sample code.

<script>
function get_value() {
	var val_by_id = $("#id_login").val();
	var val_by_name = $("input[name=login]").val();
	alert (val_by_id + " " + val_by_name);
}
</script>

<P><INPUT id="id_login" name="login" value="Jony"></P>
<P><button onClick="get_value();">OK</button></P>

DEMO 1

Get the value for JS

You must use the getElementById, getElementsByName, getElementsByClassName operator. And then .value.

document.getElementById('id_login').value;
document.getElementsByName('login')[0].value;
document.getElementsByClassName('login_class')[0].value;

<INPUT id="id_login" name="login" class="login_class">

Sample code.

<script>
function get_value() {
	var val_id = document.getElementById( "id_login" ).value;
	var val_name = document.getElementsByName( "login" )[0].value;
	var val_class = document.getElementsByClassName( "login_class" )[0].value;
	alert (val_id + " " + val_name + " " + val_class);
}
</script>

<P><INPUT id="id_login" name="login" class="login_class" value="Jony"></P>
<P><button onClick="get_value();">OK</button></P>

DEMO 2

Possible mistakes.

Why does not the getElementsByName, getElementsByClassName operator work.

If you use the getElementsByName or getElementsByClassName operator, then you must add [0].

It is not right. This is mistake.

var val_name = document.getElementsByName( "login" ).value;
document.getElementsByClassName('login_class').value;

This is the correct code.

var val_name = document.getElementsByName( "login" )[0].value;
document.getElementsByClassName('login_class')[0].value;