[oldboy-django][2深入django]学生管理(Form)-- 编辑(设置input标签属性,设置input标签默认显示值,设置input的类型)

1 django 后台实现设置input标签属性,设置input标签默认显示值,设置input输入框类型

# Form生成html标签
    a. 通过Form生成Input输入框,Form标签,以及submit标签还是要在前端写的,
        但是Form标签内的Input标签可以在后台实现;只需要按以下步骤
        - views定义StudentForm(Form)类
        - views视图函数将Form实例化对象传递给前端
        - 前端{{ obj.段 }}即可

    b. 通过Form设置前端Input的type属性,即设置不同类型的输入框
        # 设置name为text, cls_id为下拉框
        class StudentForm(Form):
            name = fields.CharField(widget= widgets.InputText())
            cls_id = fields.IntegerField(widget = widgets.Select())

    c. 设置下拉框的内容choices属性
        class StudentForm(Form):
            cls_id = fields.IntegerField(
                widget=widgets.Select(choices=models.Classes.objects.values_list('id', 'title'))
            )
        注意: choices的值必须[元组,(), ()]类型
        widget=widgets.Select(choices=[(1, '上海'), (2,'北京')])

    d.设置input输入框的class属性 -- attrs
        name = fields.CharField(max_length=8, min_length=2,
                        widget=widgets.TextInput(attrs={'class': 'form-control'})
                        )
        cls_id = fields.IntegerField(
                widget=widgets.Select(
                                        choices=models.Classes.objects.values_list('id', 'title'),
                                        attrs={'class': 'form-control'}
                                    )
            )

        注意: attrs参数必须放在TextInput或者Select等内部,而且值必须为字典

    e. 通过Form设置前端Input的默认显示值
        只要在视图函数将实例化一个Form对象,并且设置initial值即可
            student_dict = models.Student.objects.filter(id=nid).values('name', 'age', 'email', 'cls_id').first()
            obj = StudentForm(initial=student_dict)
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2 student_list.html上编辑标签

<a href="/app01/edit_student/nid={{ item.id }}" class="glyphicon glyphicon-pencil">编辑</a>|

3 编辑学生url

url(r'^edit_student/nid=(?P<nid>\d+)$', views.edit_student),

4 视图

def edit_student(request, nid):
    if request.method == "GET":
        student = models.Student.objects.filter(id=nid).values('name','age','email','cls_id').first()
        obj = StudentForm(initial=student)
        return render(request, 'app01_edit_student.html', {'obj':obj, 'nid': nid})

    else:
        obj = StudentForm(request.POST)
        if obj.is_valid():
            # 更新数据库
            models.Student.objects.filter(id=nid).update(**obj.cleaned_data)
            return redirect('/app01/students')
        else:
            return render(request, 'app01_edit_student.html', {'obj': obj})
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5 模板

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="/static/plugins/bootstrap-3.3.7-dist/css/bootstrap.css">
    <link rel="stylesheet" href="/static/plugins/font-awesome-4.7.0/css/font-awesome.css">
</head>
<body>


<div style="width: 500px; margin:0 auto">
    <h4 style="margin-left:20px;" >编辑学生</h4>
    <form class="form-horizontal" action="/app01/edit_student/nid={{ nid }}" method="POST">
        {% csrf_token %}
        <div class="form-group">
            <label class="col-sm-2 control-label">姓名:</label>
            <div class="col-sm-10">
                {{ obj.name }}{{ obj.errors.name.0 }}
            </div>
        </div>

        <div class="form-group">
            <label class="col-sm-2 control-label">年龄:</label>
            <div class="col-sm-10">
                {{ obj.age }} {{ obj.errors.age.0 }}
            </div>
        </div>
        <div class="form-group">
            <label class="col-sm-2 control-label">邮箱:</label>
            <div class="col-sm-10">
                {{ obj.email }} {{ obj.errors.email.0 }}
            </div>
        </div>
        <div class="form-group">
            <label class="col-sm-2 control-label">班级:</label>
            <div class="col-sm-10">
                {{ obj.cls_id }} {{ obj.errors.cls_id.0 }}
            </div>
        </div>
        <div class="form-group">
            <div class="col-sm-offset-2 col-sm-10">
                <input type="submit" class="btn btn-default" value="提交"/>
            </div>
        </div>
    </form>
</div>
</body>
</html>
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posted @ 2017-11-21 16:09  liuzhipenglove  阅读(1496)  评论(0编辑  收藏  举报