如何使用Javascript或jQuery更改select元素的每个选项的内容

Question

My task here is to change the content in the table whenever the select's options change.

The code below is my solution but I don't think that is good at all. What if when the options have more than 3 options... this might lead me to modify lots of in the if else condition. Thus, if you have others solution, please let me know that.

Might I set id="approve_2" as show default with my edited JSFIDDLE?

Demo

HTML:

<table>
<tr>
    <td>
        <select id="select_vehicle">
            <option value="company_vehicle">Company Vehicle</option>
            <option value="hiring_vehicle">Hiring Vehicle</option>
            <option value="taxi">Taxi</option>
        </select>
    </td>
</tr>
<tr id="company_vehicle">
    <td>Company Vehicle</td>
</tr>
<tr id="hiring_vehicle">
    <td>Hiring Vehicle</td>
</tr>
<tr id="taxi">
    <td>Taxi</td>
</tr>
</table>

Javascript:

var select_vehicle = $("#select_vehicle");
// Set selected item
var set_selected_item = $(select_vehicle).val("company_vehicle");
// Hide options "Hiring Vehicle" & "Taxi"
var company_vehicle = $("#company_vehicle"); // Get id "Company Vehicle"
var hiring_vehicle = $("#hiring_vehicle"); // Get id "Hiring Vehicle"
hiring_vehicle.hide();
var taxi = $("#taxi"); // Get id "Taxi"
taxi.hide();


$(select_vehicle).on('change', function (e) {
var optionSelected = $("option:selected", this);
var valueSelected = this.value;
if (valueSelected == "company_vehicle") {
    company_vehicle.show();
    hiring_vehicle.hide();
    taxi.hide();
} else if (valueSelected == "hiring_vehicle") {
    company_vehicle.hide();
    hiring_vehicle.show();
    taxi.hide();
} else {
    company_vehicle.hide();
    hiring_vehicle.hide();
    taxi.show();
}
});

JSFIDDLE: http://jsfiddle.net/huydq91/7us66/3/

Answer 1

You can shorten your code without repetition like this:

$('table tr:gt(0)').hide();
$('#select_vehicle').change(function() {
    var val = $(this).val();
    $('#'+val).show().siblings('tr').not(':first').hide();    
}).change();

Updated Fiddle