how to disable input field in html code example

Example 1: javascript disable input

//javascript disable
document.getElementById("id").disabled = true;
//javascript enable
document.getElementById("id").disabled = false;

//jquery disable
$('#id').attr("disabled", true);
//enable
$('#id').attr("disabled", false);

Example 2: disable input type button in html

<input type="button" disabled value="Submit">

Example 3: how to fix input field and disabled

<input type="text" readonly="readonly" />