set selected code example

Example 1: set select option as selected jquery

$(document).ready(function() {
    $("#gate option[value='Gateway 2']").prop('selected', true);
    // you need to specify id of combo to set right combo, if more than one combo
});

Example 2: javascript set html select value

// Get the html select element
var select = document.getElementById('<your select element id>');

// If you have a <option> like this:
// <option value="1">My Value Display text</option>

//Then your selected value of your select would be:

select.value = "1";

Example 3: jquery set select value

$("div.id_100 select").val("val2");