如何基于AJAX调用设置Redux Reducer的初始状态？

Question

使用Redux，我希望我的reducer的初始状态之一基于AJAX调用。基本上，我使用AJAX来获取一些数据，然后将其置于Reducer的状态。但是，由于进行了AJAX调用，在完成AJAX调用之前，将reducer初始化为初始状态。您将如何让reducer等待AJAX​​调用完成之后再设置初始状态？

存储

export default () => {
  const store = createStore(
    combineReducers({
      settings: settingsReducer,
    })
  );
  return store;
}

减速器

var settingsDefaultState;

$.ajax({
  url: 'view/content/settings.xml',
  type: 'GET',
  success: function(xml) {
    //DOING SOME STUFF WITH THE XML FILE HERE
    settingsDefaultState = {
      test: "HELLO WORLD"
    }
  },
  complete: function() {
    console.log("Settings Loaded...");
  }
});


export default (state, action) => {
  var tempState = {...state};
  switch (action.type) {
    default:
      return tempState;
  }
}

Answer 1

我建议您将状态初始化为from pdfminer.pdfinterp import PDFResourceManager, PDFPageInterpreter from pdfminer.converter import TextConverter from pdfminer.layout import LAParams from pdfminer.pdfpage import PDFPage from io import StringIO from nltk.tokenize import sent_tokenize def convert_pdf_to_txt(path): rsrcmgr = PDFResourceManager() retstr = StringIO() codec = 'utf-8' laparams = LAParams() device = TextConverter(rsrcmgr, retstr, codec=codec, laparams=laparams) fp = open(path, 'rb') interpreter = PDFPageInterpreter(rsrcmgr, device) password = "" maxpages = 0 caching = True pagenos=set() for page in PDFPage.get_pages(fp, pagenos, maxpages=maxpages, password=password,caching=caching, check_extractable=True): interpreter.process_page(page) text = retstr.getvalue() sentences = sent_tokenize(text) for s in sentences: print(s) print("\n\n") 状态。这样，您可以将发生的事情反馈给用户。然后，当ajax调用返回响应时，您将触发将状态设置为所需的下一个状态的操作。