Trigger an event on `click` and `enter`

Something like this will work

$('#usersSearch').keypress(function(ev){
if (ev.which === 13)
$('#searchButton').click();
});

Use keypress event on usersSearch textbox and look for Enter button. If enter button is pressed then trigger the search button click event which will do the rest of work. Try this.

$('document').ready(function(){
$('#searchButton').click(function(){
var search = $('#usersSearch').val();
$.post('../searchusers.php',{search: search},function(response){
$('#userSearchResultsTable').html(response);
});
})
$('#usersSearch').keypress(function(e){
if(e.which == 13){//Enter key pressed
$('#searchButton').click();//Trigger search button click event
}
});


});

Demo

$('#form').keydown(function(e){
if (e.keyCode === 13) { // If Enter key pressed
$(this).trigger('submit');
}
});

Take a look at the keypress function.

I believe the enter key is 13 so you would want something like:

$('#searchButton').keypress(function(e){
if(e.which == 13){  //Enter is key 13
//Do something
}
});

$('#usersSearch').keyup(function() { // handle keyup event on search input field


var key = e.which || e.keyCode;  // store browser agnostic keycode


if(key == 13)
$(this).closest('form').submit(); // submit parent form
}

You call both event listeners using .on() then use a if inside the function:

$(function(){
$('#searchButton').on('keypress click', function(e){
var search = $('#usersSearch').val();
if (e.which === 13 || e.type === 'click') {
$.post('../searchusers.php', {search: search}, function (response) {
$('#userSearchResultsTable').html(response);
});
}
});
});

you can use below event of keypress on document load.

 $(document).keypress(function(e) {
if(e.which == 13) {
yourfunction();
}
});

Thanks