我正在构建一个基于 django 和 react 的投票应用程序。当我使用 fetch api 将数据发布到我的 django 服务器时，我返回一些详细信息以便我可以做其他事情。我正在使用 fetch api 来处理所有 GET和我前端的 POST 方法。这是我的表单类。
export default class VoteForm extends React.Component{
constructor(props){
super(props);
this.state = {subjects:[],choosen:"",new:false,message:''};
this.handleSelect = this.handleSelect.bind(this);
this.handleSubmit = this.handleSubmit.bind(this);
this.handleNewOption = this.handleNewOption.bind(this);
}
componentWillReceiveProps(props){
this.setState({subjects:props.subjects});
this.setState({choosen:props.subjects[0]});
}
handleSelect(event){
if(event.target.value=="customize new option"){
this.setState({new:true});
}else{
this.setState({choosen:event.target.value,new:false});
}
}
handleNewOption(event){
console.log(event.target.value);
this.setState({choosen:event.target.value});
}
handleSubmit(){
let json = {
pk:this.props.pk,
subject:this.state.choosen,
};
let csrftoken = Cookies.get('csrftoken');
let header = {
"method":'POST',
"body" :JSON.stringify(json),
"credentials": 'include',
"headers":{
"X-CSRFToken": csrftoken,
"Accept": "application/json",
"Content-Type": "application/json",
}
};
//This is where it gets wrong.Both alerts didn't work.It only prompted the small window a few times after I quickly clicked the mouse several times.And response wasn't consoled either.
fetch('/voteapp/addvoteforsubject/ ',header)
.then(function(response){
alert("get response");
return response.json();
})
.then(function(response){
//console.log(response);
alert(response.detail);
})
.catch(function(error){
console.log(error);
});
}
render(){
let Options = this.state.subjects.map((opt,index)=>(<option key={index}>{ opt }</option>));
let new_input;
let submit;
if(this.state.new){
new_input = (<input type="text" className="form-control" placeholder="type new option" onChange={this.handleNewOption}></input>);
submit = ( <button className="btn btn-secondary btn-block" onClick={this.handleSubmit}>Submit</button>);
}else{
submit = ( <button className="btn btn-secondary btn-block" onClick={this.handleSubmit}>Submit</button>);
}
return (
<form>
<label>Select</label>
<select className="form-control" onChange={this.handleSelect}>
<option selected disabled>Choose your option</option>
{ Options }
<option>customize new option</option>
</select>
{ new_input }
{ submit }
</form>
);
}
}
这是我的 django View 函数:
@api_view(['GET','POST'])
def vote_or_not(request):
if request.method == 'GET':
return Response(data={'message':'Get data'})
if request.method == 'POST':
vote = VoteTitle.objects.get(pk=request.data['pk'])
if request.user.is_authenticated():
if Votes_ip.objects.filter(vote_title=vote,ip_address=request.META['REMOTE_ADDR']).count()== 0 and Votes.objects.filter(voter=request.user,vote_title=vote).count()==0:
a = Votes_ip.objects.create(vote_title=vote,ip_address=request.META['REMOTE_ADDR'])
b = Votes.objects.create(voter=request.user,vote_title=vote)
subject = vote.subjects.get_or_create(name=request.data['subject'])[0]
subject.votes += 1
subject.save()
print("Not Voted")
return Response(data={'detail':'succeed'})
elif Votes_ip.objects.filter(vote_title=vote,ip_address=request.META['REMOTE_ADDR']).count() ==0:
a = Votes_ip.objects.create(vote_title=vote,ip_address=request.META['REMOTE_ADDR'])
subject = vote.subjects.get_or_create(name=request.data['subject'])[0]
subject.votes += 1
subject.save()
print("Not Voted")
return Response(data={'detail':'succeed'})
print("Voted")
return Response({'detail':"you have created once"})
我使用 django rest 框架来执行此操作。在我将数据发布到后端后，服务器显示了一个 http 200 状态代码。所以我真的不知道我哪里错了。
最佳答案
您的 header 中缺少某些内容。
你需要明确地告诉你的请求是 AJAX
'X-Requested-With': 'XMLHttpRequest'
否则，作为 CORS 安全的一部分，“飞行前”请求会在实际 POST 请求之前完成，这解释了您在服务器上看到的“http 200 状态代码”。这是对此“飞行前”请求的响应。
参见 Django documentation on ajax 和 Stack overflow about x-requested-with header
(编辑以添加链接描述)
关于 'POST' 数据到 Django 服务器后，Javascript 获取 api 没有得到响应，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45278109/