如何在选项字段中显示编辑表单和选定的值

Here i want to do,some one click edit button means, i want show the edit form in same page and in that edit form i want to show already what value wrote,that value i want to display in that form field,here i did for truck name becauze this one for input=text ,but next field i am not able to show which state already he selected,how can do this

<?php
$sql = "SELECT * FROM trucks WHERE status !='1' ORDER BY reg_date DESC";
$result = mysql_query($sql);
$cat=array();
while($row = mysql_fetch_array($result)){
    echo '<tr>
            <td>'.$row["truck_name"].'</td>
            <td>'.Getstate($row["state_id"]).'</td>
            <td>'.Getcity($row["city_id"]).'</td>
            
            <td class="col-medium center">
            <div class="btn-group btn-group-xs ">
            <a class="btn btn-inverse" style="cursor:pointer;" onclick="show_edit_menu(\''.$row["id"].'\',\''.$row["truck_name"].'\',\''.$row["state_id"].'\',\''.$row["city_id"].'\')"><i class="fa fa-edit icon-only"></i>Edit</a>
            <a class="btn btn-danger" onclick="truck_deletemenu('.$row["id"].')"><i class="fa fa-times icon-only"></i>Delete</a>
            </div>
            </td>
        </tr>';
}

?><?php
$sql = "SELECT * FROM trucks WHERE status !='1' ORDER BY reg_date DESC";
$result = mysql_query($sql);
$cat=array();
while($row = mysql_fetch_array($result)){
    echo '<tr>
            <td>'.$row["truck_name"].'</td>
            <td>'.Getstate($row["state_id"]).'</td>
            <td>'.Getcity($row["city_id"]).'</td>
            
            <td class="col-medium center">
            <div class="btn-group btn-group-xs ">
            <a class="btn btn-inverse" style="cursor:pointer;" onclick="show_edit_menu(\''.$row["id"].'\',\''.$row["truck_name"].'\',\''.$row["state_id"].'\',\''.$row["city_id"].'\')"><i class="fa fa-edit icon-only"></i>Edit</a>
            <a class="btn btn-danger" onclick="truck_deletemenu('.$row["id"].')"><i class="fa fa-times icon-only"></i>Delete</a>
            </div>
            </td>
        </tr>';
}

?>
  
  
  <script>
    function show_edit_menu(id,t_name,state_id,city_id){
    $("#show_edit_menu").show();
    
    $("#tid").val(id);//truck auto id
    $("#tname").val(t_name);//Truck Name
    $("#state").val(state_id);//state id
    
    console.log(t_name);//i got truck name value here
    console.log(state_id);//i got state name value here
    
    
    }
</script> 
<!--edit part here-->
<div class="portlet" id="show_edit_menu" style="display:none;">
<div class="portlet-heading dark">
<div class="portlet-title">
    <h4>Edit Menu</h4>
</div>
<div class="portlet-widgets">
    <a data-toggle="collapse" data-parent="#accordion" href="#f-3"><i class="fa fa-chevron-down"></i></a>
</div>
<div class="clearfix"></div>
</div>
<div id="f-3" class="panel-collapse collapse in">
<div class="portlet-body">
    <form class="form-horizontal" role="form" id="edit_form" method="post" enctype="multipart/form-data">
    
        <div class="form-group">
            <label class="col-sm-2 control-label">Truck Name<span class="require">*</span></label>
            <div class="col-sm-8">
                <input type="text" class="form-control" value="" name="tname" id="tname">
                <input type="hidden" class="form-control" value="" name="tid" id="tid">
            </div>
        </div>
        
        <div class="form-group">
                    <label class="col-sm-2 control-label">State<span class="require">*</span></label>
                    <div class="col-sm-8">
                         <select class="form-control intro-form-fixer state" required="" id="state" name="state" data-msg-required="Please enter your State" value="" aria-required="true">
                         <option value="1"> I want to show which state i selected</option>
                    </select>
                    <!--<input type="hidden" id="state" name="state" value="" />-->
                    </div>
                </div>
        
        
        <div class="form-actions">
            <div class="form-group">
                <div class="col-sm-offset-2 col-sm-10">
                    <button type="button" class="btn btn-primary" onclick="edit_menu()">Submit</button>
                </div>
            </div>
        </div>
    </form>
</div>
</div>
</div>
            

</div>

Try this:

$("#state option[value='"+state_id+"']").attr("selected", true); 

instead of

$("#state").val(state_id);