Python自动化之modelform和原生ajax

modelform验证

`views.py`
from django.shortcuts import render,HttpResponse
from app01 import models

from django import forms
from django.forms import fields as Ffields
from django.forms import widgets as Fwidgets
class UserInfoModelForm(forms.ModelForm):

    is_rmb = Ffields.CharField(widget=Fwidgets.CheckboxInput())

    class Meta:
        model = models.UserInfo
        fields = '__all__'
        # fields =  ['username','email']
        # exclude = ['username']

modelform修改

views.py
def user_edit(request, nid):
    # 获取当前id对象的用户信息
    # 显示用户已经存在数据
    if request.method == "GET":
        user_obj = models.UserInfo.objects.filter(id=nid).first()
        mf = UserInfoModelForm(instance=user_obj) //初始化数据
        return render(request,'user_edit.html',{'mf': mf, 'nid': nid})
    elif request.method == 'POST':
        user_obj = models.UserInfo.objects.filter(id=nid).first()
        mf = UserInfoModelForm(request.POST,instance=user_obj) //更新数据
        if mf.is_valid():

            mf.save()
        else:
            print(mf.errors.as_json())
        return render(request,'user_edit.html',{'mf': mf, 'nid': nid})

views.py
def index(request):
    if request.method == "GET":
        obj = UserInfoModelForm()
        return render(request,'index.html',{'obj': obj})
    elif request.method == "POST":
        obj = UserInfoModelForm(request.POST)
        if obj.is_valid():
            # obj.save()
            instance = obj.save(False) //多对多保存
            instance.save()            //多对多保存 
            obj.save_m2m()             //多对多保存 
            
            

form表单初始化需要在form实例添加initial,例如:obj=UserFrom(initial={'name':'wushi'}),initial值是个字典

modelform总结

1. 生成HTML标签：class Meta: ...
2. mf = xxxModelForm(instance=ModelObj)
3. 额外的标签， is_rmb = Ffields.CharField(widget=Fwidgets.CheckboxInput())
4. 各种验证 is_valid() -> 各种钩子...
5. 	mf.save()
	# 或
	instance = mf.save(False)
	instance.save()
	mf.save_m2m()

原生ajax向后台提交数据

        function Ajax1(){
            var xhr = getXHR();
            //var xhr = new XMLHttpRequest();
            xhr.open('POST', '/ajax_json/',true);
            xhr.onreadystatechange = function(){
                if(xhr.readyState == 4){
                    // 接收完毕
                    var obj = JSON.parse(xhr.responseText);
                    console.log(obj);
                }
            };
            xhr.setRequestHeader('k1','v1');
            xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset-UTF-8'); //这是请求头是必须写的,这样django才能取到数据
            xhr.send("name=root;pwd=123");
        }

ajax兼容IE

    function getXHR(){
        var xhr = null;
        if(XMLHttpRequest){
            xhr = new XMLHttpRequest();
        }else{
            xhr = new ActiveXObject("Microsoft.XMLHTTP");
        }
        return xhr;

    }

伪ajax,通过ifram进行数据的发送

        function sumitForm(){
            $('#ifm1').load(function(){
                var text = $('#ifm1').contents().find('body').text();
                var obj = JSON.parse(text);
            })
        }

ifram接受到的数据,不是存在ifram标签里面而是一个document,也就是一个网页文档
所以可以绑定一个load事件,在其加载完之后取值.