本文介绍了XMLHttpRequest 抛出 InvalidSateError 说“必须打开对象状态";的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!
问题描述
限时送ChatGPT账号..
代码 -
"use strict";
var AJAX = function (params) {
this.server ={};
this.url = params.url;
this.method = params.method;
this.dataType = params.dataType;
this.formData = params.formData;
this.init = function(){
if(typeof XMLHttpRequest != 'undefined'){
this.server = new XMLHttpRequest();
this.server.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
this.server.setRequestHeader('Content-length', this.formData.length);
this.server.setRequestHeader('Connection', 'close');
console.log("XMLHttpRequest created.");
return true;
}
};
this.send = function(){
if(this.init()){
this.server.open(this.method, this.url, true);
this.server.send(this.formData);
}
};
};
它抛出以下错误:
Error in event handler for contextMenus: InvalidStateError: Failed to execute 'setRequestHeader' on 'XMLHttpRequest': The object's state must be OPENED.
如何使用 -
var data = new FormData();
data.append('user', 'sachin');
var params = {
url : 'example.com',
method : 'post',
dataType: 'json',
formData : data
};
var backgroundWindow = chrome.extension.getBackgroundPage();
var ajax = new backgroundWindow.AJAX(params);
ajax.send();
我似乎无法弄清楚背后的原因.
I can't seem to figure out what's the reason behind.
推荐答案
错误是直截了当的:
contextMenus 的事件处理程序出错:InvalidStateError:无法在XMLHttpRequest"上执行setRequestHeader":对象的状态必须是 OPENED.
Error in event handler for contextMenus: InvalidStateError: Failed to execute 'setRequestHeader' on 'XMLHttpRequest': The object's state must be OPENED.
你需要在设置请求头之前调用.open(..)
.
You need to call .open(..)
before setting the request headers.
鉴于您的代码,我相信最好的方法是将调用移动到 init(..)
函数中的 open .
Given your code, I believe the best way would be to move the call to open in the init(..)
function.
var AJAX = function (params) {
this.server ={};
this.url = params.url;
this.method = params.method;
this.dataType = params.dataType;
this.formData = params.formData;
this.init = function(){
if(typeof XMLHttpRequest != 'undefined'){
this.server = new XMLHttpRequest();
//Open first, before setting the request headers.
this.server.open(this.method, this.url, true);
//Now set the request headers.
this.server.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
//this.server.setRequestHeader('Content-length', this.formData.length);
//this.server.setRequestHeader('Connection', 'close');
console.log("XMLHttpRequest created.");
return true;
}
};
this.send = function(){
if(this.init()){
this.server.send(this.formData);
}
};
};
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