set focus javascript

focusMethod = function getFocus() {          
  document.getElementById("myButton").focus();
}

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

// GIVE FOCUS TO A TEXT FIELD IMMEDIATELY AFTER WINDOW LOADS

 window.onload = function() {
  document.getElementById("myText").focus();
}; 

// ElementObject grabs focus

 HTMLElementObject.focus()

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