[英]Use response of XMLHttpRequest
I'm new in JS and I'm trying to create a function that check something before submit a form. 我是JS的新手,正在尝试创建一个在提交表单之前检查某些内容的函数。 On html I have: 在html上,我有:
<form name="loginform" method="post" onsubmit="return foo()" action="adminlogin.php"> ... </form>
The function foo() is: 函数foo()是:
foo(){
if(..){
return false;
}
else{
var url = "credenziali.php";
var params = "name="+username+"&password="+password;
var http_r = new XMLHttpRequest();
http_r.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
//something
}
};
http_r.open("GET", url+"?name="+username+"&pass="+password, true);
http_r.send();
// here I want to return false or true dependence of responseText
}
the comment in the function is where I want use the what the request returns. 函数中的注释是我要使用请求返回的内容。 How can I do? 我能怎么做?
Try insert this before http_r.send() with your return inside. 尝试将其插入http_r.send()之前,并在其中插入返回值。
http_r.onload = function() { if (http_r.status >= 200 && http_r.status < 400) { // Success! } else { // We reached our target server, but it returned an error } };
改用JQuery AJAX ... http://api.jquery.com/jquery.ajax/更为简洁。
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