I have a drop-down list which POSTs to express and then **redirects to same page**.

1. Now, I want the one valid option to be selected before submitting, hence I added `required` property in `<select>` tag.
2. But, I also want a value to be Selected in the list when page renders

* If first time render, then first option
* If after submitting, the submitted option to be selected by default

Here is the skeleton code

```
<select required data-style="btn-info" name="selectpicker">
        <optgroup label="Select Map">
            <option name="table1" value="Station">Station</option>
            <option name="table2" value="Station2">Station2</option>
        </optgroup>
</select>

```

and the things I tried

```
<option value="" selected disabled>Select station</option>

```

```
<option name="table1" value="Station" selected>Station</option>

```

but none of them fulfills my requirements.