[英]How to send a FastAPI response without redirecting the user to another page?
I am creating an API using FastAPI, which receives form-data
from an HTML page, process the data (requiring a few moments) and returns a message saying this task is complete.我正在使用 FastAPI 创建一个 API,它从 HTML 页面接收form-data
,处理数据(需要一些时间)并返回一条消息,说明此任务已完成。
This is my backend:这是我的后端:
from cgi import test
from fastapi import FastAPI, Form, Request
from starlette.responses import FileResponse
app = FastAPI()
@app.post("/")
async def swinir_dict_creation(request: Request,taskname: str = Form(...),tasknumber: int = Form(...)):
args_to_test = {"taskname":taskname, "tasknumber":tasknumber} # dict creation
print('\n',args_to_test,'\n')
# my_function_does_some_data_treatment.main(args_to_test)
# return 'Treating...'
return 'Super resolution completed! task '+str(args_to_test["tasknumber"])+' of '+args_to_test["taskname"]+' done'
@app.get("/")
async def read_index():
return FileResponse("index.html")
This is my frontend code:这是我的前端代码:
<html>
<head>
<h1><b>Super resolution image treatment</b></h1>
<body>
<form action="http://127.0.0.1:8000/" method="post" enctype="multipart/form-data">
<label for="taskname" style="font-size: 20px">Task name*:</label>
<input type="text" name="taskname" id="taskname" />
<label for="tasknumber" style="font-size: 20px">Task number*:</label>
<input type="number" name="tasknumber" id="tasknumber" />
<b><p style="display:inline"> * Cannot be null</p></b>
<button type="submit" value="Submit">Start</button>
</form>
</body>
</head>
</html>
So the frontend page looks like this:所以前端页面是这样的:
When the processing is finished in the backend, after the user submitted some data, the return statement from FastAPI backend simply redirects the user to a new page showing only the return message.当后端处理完成后,用户提交了一些数据后,FastAPI 后端的 return 语句只是将用户重定向到一个只显示返回消息的新页面。 I was looking for a alternative that would keep the HTML form appearing and display the message returned from the server below this form.我正在寻找一种替代方法,它可以保持 HTML 表单出现并在此表单下方显示从服务器返回的消息。 For example:例如:
I searched in FastAPI documentation about requests , but I haven't found anything that could avoid modifying my original HTML page.我在FastAPI 文档中搜索了 requests ,但没有找到任何可以避免修改我原来的 HTML 页面的内容。
You would need to use a Javascript interface/library, such as Fetch API , to make an asynchronous HTTP request.您需要使用 Javascript 接口/库,例如Fetch API来发出异步 HTTP 请求。 Also, you should use Templates to render and return a TemplateResponse
, instead of FileResponse
, as shown in your code.此外,您应该使用模板来呈现和返回TemplateResponse
,而不是FileResponse
,如您的代码所示。 Example below:下面的例子:
app.py应用程序.py
from fastapi import FastAPI, Form, Request
from fastapi.templating import Jinja2Templates
app = FastAPI()
templates = Jinja2Templates(directory="templates")
@app.post("/submit")
async def submit(request: Request, taskname: str = Form(...), tasknumber: int = Form(...)):
return f'Super resolution completed! task {tasknumber} of {taskname} done'
@app.get("/")
async def index(request: Request):
return templates.TemplateResponse("index.html", {"request": request})
templates/ index.html模板/索引.html
<html>
<head>
<script type="text/javascript">
function submitForm() {
var formElement = document.getElementById('myForm');
var data = new FormData(formElement);
fetch('/submit', {
method: 'POST',
body: data,
})
.then(response => response.text())
.then(data => {
document.getElementById("responseArea").innerHTML = data;
})
.catch(error => {
console.error(error);
});
}
</script>
</head>
<body>
<h1>Super resolution image treatment</h1>
<form method="post" id="myForm">
<label for="taskname" style="font-size: 20px">Task name*:</label>
<input type="text" name="taskname" id="taskname" />
<label for="tasknumber" style="font-size: 20px">Task number*:</label>
<input type="number" name="tasknumber" id="tasknumber" />
<b><p style="display:inline"> * Cannot be null</p></b>
<input type="button" value="Start" onclick="submitForm()">
</form>
<div id="responseArea"></div>
</body>
</html>
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