js focus input field code example

Example 1: set focus javascript

document.getElementById("ThingToSetFocusOn").focus();

Example 2: set focus on input field javascript

window.onload=function(){
 document.getElementById("id_here").focus();
}
// id_here = put the id of the HTML element where you want to set focus.

Example 3: focus js

<input type="text" id="myTextField" value="Text field.">
<p></p>
<button type="button" onclick="focusMethod()">Click me to focus on the text field!</button>