[英]Live username lookup with AJAX/Jquery
I want to have a javascript function such as this: 我想要一个像这样的javascript函数:
function isUsernameAvailable(username)
{
//Code to do an AJAX request and return true/false if
// the username given is available or not
}
How can this be accomplished using Jquery or Xajax? 如何使用Jquery或Xajax完成此操作?
The big win when using AJAX is that it is asynchronous. 使用AJAX的最大好处是它是异步的。 You're asking for a synchronous function call.
您正在要求同步函数调用。 This can be done, but it might lock up the browser while it is waiting for the server.
可以这样做,但是它可能会在等待服务器时锁定浏览器。
Using jquery: 使用jQuery:
function isUsernameAvailable(username) {
var available;
$.ajax({
url: "checkusername.php",
data: {name: username},
async: false, // this makes the ajax-call blocking
dataType: 'json',
success: function (response) {
available = response.available;
}
});
return available;
}
Your php-code should then check the database, and return 然后,您的php代码应检查数据库,然后返回
{available: true}
if the name is ok. 如果名称可以。
That said, you should probably do this asynchronously. 也就是说,您可能应该异步执行此操作。 Like so:
像这样:
function checkUsernameAvailability(username) {
$.getJSON("checkusername.php", {name: username}, function (response) {
if (!response.available) {
alert("Sorry, but that username isn't available.");
}
});
}
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