如何使用Javascript动态填充Django模板中的选择列表？

Question

我最近一直在学习Django和HTML，但是我对JavaScript完全陌生。我正在创建一个带有过滤器菜单的数据库显示页面。对于此页面，我有以下代码：

Model.py：

class Part(models.Model):
    PartID = models.AutoField(primary_key=True, unique=True)
    SiteID = models.ForeignKey('Site', on_delete=models.CASCADE, null=True)
    Comment = models.CharField(max_length=255, blank=True)
    Subtype = models.ForeignKey('Subtype', on_delete=models.CASCADE, null=True)
    Location = models.CharField(max_length=255, blank=True)
    ConnectedTo= models.ManyToManyField('self', null=True)
    BatchNo = models.CharField(max_length=32, blank=False, null=True)
    SerialNo = models.CharField(max_length=32,blank=True)
    Manufacturer = models.CharField(max_length=32, blank=False, null=True)
    Length = models.FloatField(blank=True, null=True)
    InspectionPeriod = models.IntegerField(blank=True, null=True)
    LastInspected = models.DateField(blank=True, null=True)
    InspectionDue = models.CharField(max_length=255, blank=True)

View.py：

@login_required(login_url='/accounts/login/')
def sites(request, site):

    siteselected = site
    warnings = 0
    expired = 0
    good = 0
    PartsAtSite = Part.objects.filter(SiteID = siteselected)
    TypesList = Type.objects.values_list('TypeName', flat=True).distinct()
    InspectionList = Part.objects.values_list('InspectionPeriod', flat=True).distinct()
    LengthList = Part.objects.values_list('Length', flat=True).distinct()
    LocationList = Part.objects.values_list('Location', flat=True).distinct()
    ManufacturerList = Part.objects.values_list('Manufacturer', flat=True).distinct()

    for part in PartsAtSite:
        if part.LastInspected == None:
            part.InspectionDue = "Yes"
            expired = expired + 1

        else:
            Deadline = part.LastInspected + timedelta(days=part.InspectionPeriod)

        if datetime.now().date() > Deadline:
            part.InspectionDue = "Yes"
            expired = expired + 1

        elif datetime.now().date() > (Deadline - timedelta(days=30)):
            part.InspectionDue = "<30 Days"
            warnings = warnings + 1
        else:
            part.InspectionDue = "No"
            good = good + 1
    part.save()

    context = {
        'TypesList': TypesList,
        'InspectionList': InspectionList,
        'LengthList': LengthList,
        'LocationList': LocationList,
        'ManufacturerList': ManufacturerList,
        'PartsAtSite': PartsAtSite,
        'expired': expired,
        'warnings': warnings,
        'good': good,
        'SiteName': Site.objects.get(SiteID = siteselected).SiteName,
        'SiteNo': Site.objects.get(SiteID = siteselected).SiteID,
    }

template = loader.get_template('moorings/sites.html')
return HttpResponse(template.render(context, request))

以及我的过滤器div的HTML：

<div id="filterdiv" class="dark">
    <center><h3>Filters</h3></center>
    <br>

    <center>Type</center>
    <select name="Types">
        <option>All</option>
        {% for types in TypesList %}
            <option>{{types}}</option>
        {%endfor%}
    </select>
    <br>
    <br>

    <center>Inspection Period</center>
    <select name="Inspection Period">
        <option>All</option>
        {% for inspections in InspectionList %}
            <option>{{inspections}}</option>
        {%endfor%}
    </select>
    <br>
    <br>

    <center>Length</center>
    <select name="Length">
        <option>All</option>
        {% for lengths in LengthList %}
            <option>{{lengths}}</option>
        {%endfor%}
    </select>
    <br>
    <br>

    <center>Location</center>
    <select name="Location">
        <option>All</option>
        {% for locations in LocationList %}
            <option>{{locations}}</option>
        {%endfor%}
    </select>
    <br>
    <br>

    <center>Manufacturer</center>
    <select name="Manufacturer">
        <option>All</option>
        {% for manufacturers in ManufacturerList %}
            <option>{{manufacturers}}</option>
        {%endfor%}
    </select>
    <br>
    <br>
    <button>Apply Filter (TODO)</button>
    <button>Reset Filters (TODO)</button>
</div>

我能够很好地填写列表，但是我希望能够对其进行更改，以便在选择Type后打开Manufacturer下拉框时，我只会得到[ Type中的C0] s。

谢谢。

Answer 1

我知道这很好用：

Manufacturer

但是在选择了选项之后，您希望制造商列表仅显示所选类型选项吗？

如果没有，请让我知道您想要的代码工作流程！