XMLHttpRequest 在 function 内部调用时未收到响应

Question

I have an HTML form that calls upon submitting, the function-

function getLocationTemp() {
    temp= new XMLHttpRequest();
    temp.open('GET', 'url', true);
    temp.onload = function () {
        console.log(temp.response);
    }
    temp.send();
}

For some reason, I never receive a response to this API call. I have tried debugging the readyState, and i's always at- 1.

Although, when I execute the same block of code outside of the function as such-

temp= new XMLHttpRequest();
temp.open('GET', 'url', true);
temp.onload = function () {
    console.log(temp.response);
    }
temp.send();
function getLocationTemp() {
console.log('random');
}

It works, I get the data, and response code as- 4.

I assumed the issue was that the flow was leaving the function, and so the local onload was out of scope. So tried running a for loop from 0-100 within the function thinking it would give it enough time to get the response, and also put in a while loop that wouldn't exit until readystate became 4. But the state won't move past 1.

What seems to be the issue?

Answer 1

As listed in the above replies, the action is re-rendering the page and killing off the request. This would be rather done as an onclick function handler or a change of the structure to call it using the form tag and its attributes like action and method .

An example of doing this via the onclick method would be -

function getLocationTemp() {
    temp= new XMLHttpRequest();
    temp.open('GET', 'url', true);
    temp.onload = function () {
        console.log(temp.response);
    }
    temp.send();
}

and in the html something like this -

<button  type="button" onclick="getLocationTemp()">Submit Form</button>