我想在第一个选择下拉列表中选择一个选项，根据所选的选项，ajax应该加载第二个选择下拉列表，怎么做？

这是我的代码:

型号:

class MaintenanceEquipment(models.Model):
    equip_id = models.CharField(max_length=30, auto_created=False, primary_key=True)
    line_nm = models.CharField(max_length=20, blank=True, null = True)
    sequence = models.CharField(max_length=30, blank=True, null = True)
    equip_model = models.CharField(max_length=30, blank=True, null = True)

    def __str__(self):
    return self.equip_id

视图:

class MaintenanceEquipment(models.Model):
    equip_id = models.CharField(max_length=30, auto_created=False, primary_key=True)
    line_nm = models.CharField(max_length=20, blank=True, null = True)
    sequence = models.CharField(max_length=30, blank=True, null = True)
    equip_model = models.CharField(max_length=30, blank=True, null = True)

    def __str__(self):
    return self.equip_id

网址:

class MaintenanceEquipment(models.Model):
    equip_id = models.CharField(max_length=30, auto_created=False, primary_key=True)
    line_nm = models.CharField(max_length=20, blank=True, null = True)
    sequence = models.CharField(max_length=30, blank=True, null = True)
    equip_model = models.CharField(max_length=30, blank=True, null = True)

    def __str__(self):
    return self.equip_id

maintenanceissue.html:

class MaintenanceEquipment(models.Model):
    equip_id = models.CharField(max_length=30, auto_created=False, primary_key=True)
    line_nm = models.CharField(max_length=20, blank=True, null = True)
    sequence = models.CharField(max_length=30, blank=True, null = True)
    equip_model = models.CharField(max_length=30, blank=True, null = True)

    def __str__(self):
    return self.equip_id

数据通过GET正确发送到视图，这是我的终端:

[21/seP/2021 08:34:43]“得到 /maintenance/ajax/load_equipment/？line_nm=smd-16 http/1.1“200 186 44

这是console.log正确的结果:

class MaintenanceEquipment(models.Model):
    equip_id = models.CharField(max_length=30, auto_created=False, primary_key=True)
    line_nm = models.CharField(max_length=20, blank=True, null = True)
    sequence = models.CharField(max_length=30, blank=True, null = True)
    equip_model = models.CharField(max_length=30, blank=True, null = True)

    def __str__(self):
    return self.equip_id

但是，在我的html中选择“sequence”是空的，我尝试了很多事情，但没有成功。

顺晟科技：

以下是一般模式:

template.html