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function show_sub(v){
alert(v);
$.get("/admin/getSubType/"+v, function(data) {
var data = eval(data);
jQuery("#product_sub_type").empty();
for(var i = 0 ; i < data.length ; i++)
{
jQuery("#product_sub_type").append("<option vaule='"+data[i].sub_type_id +"'>"+data[i].sub_type_name+"</option>");
}
});
}
<div class="form-group">
<label for="product_type" class="col-sm-4 control-label">大类<b></b></label>
<div class=" col-sm-8" >
<select id="product_type" name="product_type" class="form-control" onchange="show_sub(this.options[this.options.selectedIndex].value)">
@foreach ($pTypes as $type)
<option value="{{$type->type_id}}">{{$type->type_name}}</option>
@endforeach
</select>
</div>
</div>
<div class="form-group">
<label for="product_sub_type" class="col-sm-4 control-label">小类</label>
<div class=" col-sm-8" >
<select id="product_sub_type" name="product_sub_type" class="form-control">
</select>
</div>
</div>