我正在工作的网站上有一些显示,可以正常运行,但是即使某些元素为null
,也可以向我显示所有内容。我使用的是Django,并具有下面的模型,我想使用该模型来更改显示:
class Exchange(models.Model):
YEAR_CHOICE = ((4, '4TC'),
(5, '5TC'))
SEMESTER_CHOICE = ((1, 'S1'),
(2, 'S2'))
GRADE = ((1, '1'),
(2, '2'),
(3, '3'),
(4, '4'),
(5, '5'))
ID = models.AutoField(primary_key=True)
Year = models.IntegerField(default=-1, choices=YEAR_CHOICE)
StartDate = models.DateField()
EndDate = models.DateField()
Semester = models.IntegerField(default=-1, choices=SEMESTER_CHOICE)
Visa = models.BooleanField(default=False)
Comment = models.CharField(max_length=1000, null=True, blank=True)
VisaMonths = models.IntegerField(null=True, blank=True, default=-1,)
VisaWeeks = models.IntegerField(null=True, blank=True, default=-1,)
VisaDays = models.IntegerField(null=True, blank=True, default=-1)
Rent = models.IntegerField(null=True, blank=True, default=-1)
MonthlyExpenses = models.IntegerField(null=True, blank=True, default=-1)
NightLifeGrade = models.IntegerField(null=True, blank=True, default=-1,choices=GRADE)
CulturalLifeGrade = models.IntegerField(null=True, blank=True, default=-1,choices=GRADE)
Security = models.IntegerField(null=True, blank=True, default=-1,choices=GRADE)
Student = models.ForeignKey('Student', on_delete=models.CASCADE)
University = models.ForeignKey('University', on_delete=models.CASCADE)
def __str__(self):
return str(self.ID)
在我的HTML页面中,我有以下内容:
<button class="accordion">Commentaires</button>
<div class="panel">
{% for e in ex %}
<h5>{{e.Student.Name}} {{e.Student.Surname}}, parti en {{e.StartDate}} ({{e.Year}}A {{e.Student.INSADepartement}} S{{e.Semester}})</h5>
<blockquote>{{e.Comment}}</blockquote>
{% endfor %}
</div>
如果e.Comment
不是null
,我只想在按钮中显示信息。我尝试在for循环中添加{% if(e.Comment) %} ... {% endif %}
,但始终收到Could not parse the remainder
错误。
关于如何执行此检查的任何想法?
答案 0 :(得分:1)
Change your html page, you just need to change your if condition.
<button class="accordion">Commentaires</button>
<div class="panel">
{% for e in ex %}
<h5>{{e.Student.Name}} {{e.Student.Surname}}, parti en {{e.StartDate}} ({{e.Year}}A {{e.Student.INSADepartement}} S{{e.Semester}})</h5>
{% if e.Comment %}
<blockquote>{{e.Comment}}</blockquote>
{% endif %}
{% endfor %}
</div>
And if you don't want to display anything, if there is no comment. Then your html page should be like this
<button class="accordion">Commentaires</button>
{% for e in ex %}
{% if e.Comment %}
<div class="panel">
<h5>{{e.Student.Name}} {{e.Student.Surname}}, parti en {{e.StartDate}} ({{e.Year}}A {{e.Student.INSADepartement}} S{{e.Semester}})</h5>
<blockquote>{{e.Comment}}</blockquote>
</div>
{% endif %}
{% endfor %}