更新: 我没有提及我已经阅读了 suggested duplicate answer它并没有让我更进一步,因为我不明白它与我的问题有什么关系。不过,下面的用户 ponury-kostek 确实设法简单地解释了它,没有那么困惑,让我能够理解。所以我不认为它是重复的。
我正在尝试在用户使用 LinkedIn 登录时将用户数据保存到数据库中(以跟踪谁观看了我的页面)。我找到了一个使用jQuery的教程,我发现了一个GitHub (here)页面将 jQuery 转换为 Vanilla JS,但我很难理解我需要做什么来转换这个特定的语句。
我只使用一行 jQuery 就可以完成整个工作,没有任何问题 - 但我不想强制用户加载 jQuery 库!
我将发布我正在尝试转换的 jQuery、迄今为止我拥有的 Vanilla JS 解决方案以及 GitHub 页面上建议的转换“公式”:
我正在尝试转换 jQuery:
$.post('saveUserData.php',
{
oauth_provider: 'linkedin',
userData: JSON.stringify(userData)
},
function(data){ return true; });
我对 Vanilla JS 解决方案的尝试
var theUrl = 'saveUserData.php';
var httpRequest = new XMLHttpRequest();
httpRequest.onreadystatechange = function (data) {
};
httpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
httpRequest.open('POST', theUrl);
httpRequest.send({oauth_provider:'linkedin',userData: JSON.stringify(userData)}, function(data){ return true; });
抛出错误:
script.js:10 Uncaught DOMException: Failed to execute 'setRequestHeader' on 'XMLHttpRequest': The object's state must be OPENED.
at saveUserData (http://localhost:8012/linkedCV/script.js:10:14)
at displayProfileData (http://localhost:8012/linkedCV/index.php:43:4)
at B.<anonymous> (https://platform.linkedin.com/js/framework?v=1.0.350-1429&lang=undefined:3350:17)
at B.runHandler (https://platform.linkedin.com/js/framework?v=1.0.350-1429&lang=undefined:172:9)
at B.<anonymous> (https://platform.linkedin.com/js/framework?v=1.0.350-1429&lang=undefined:3355:6)
at B.handleSuccessResults (https://platform.linkedin.com/js/framework?v=1.0.350-1429&lang=undefined:172:9)
at Object.g [as success] (https://platform.linkedin.com/js/framework?v=1.0.350-1429&lang=undefined:3243:4)
at Object.incoming (https://platform.linkedin.com/js/framework?v=1.0.350-1429&lang=undefined:817:38)
at _window_onMessage (https://platform.linkedin.com/js/framework?v=1.0.350-1429&lang=undefined:581:102)
我的 JS(在索引 header 中):
<script type="text/javascript" src="//platform.linkedin.com/in.js">
api_key: thecorrectAPIkey aka 'Client ID'
authorize: true
onLoad: onLinkedInLoad
scope: r_basicprofile r_emailaddress
</script>
<script type="text/javascript">
// Setup an event listener to make an API call once auth is complete
function onLinkedInLoad() {
IN.Event.on(IN, "auth", getProfileData);
}
// Use the API call wrapper to request the member's profile data
function getProfileData() {
IN.API.Profile("me").fields("id", "first-name", "last-name", "headline", "location", "picture-url", "public-profile-url", "email-address").result(displayProfileData).error(onError);
}
// Handle the successful return from the API call
function displayProfileData(data){
var user = data.values[0];
document.getElementById("picture").innerHTML = '<img src="'+user.pictureUrl+'" />';
document.getElementById("name").innerHTML = user.firstName+' '+user.lastName;
document.getElementById("intro").innerHTML = user.headline;
document.getElementById("email").innerHTML = user.emailAddress;
document.getElementById("location").innerHTML = user.location.name;
document.getElementById("link").innerHTML = '<a href="'+user.publicProfileUrl+'" target="_blank">Visit profile</a>';
document.getElementById('profileData').style.display = 'block';
saveUserData(user);
}
// Handle an error response from the API call
function onError(error) {
console.log(error);
}
// Destroy the session of linkedin
function logout(){
IN.User.logout(removeProfileData);
}
// Remove profile data from page
function removeProfileData(){
document.getElementById('profileData').remove();
}
</script>
GitHub 转换建议:
// jQuery
$.post('//example.com', { username: username }, function (data) {
// code
})
// Vanilla
var httpRequest = new XMLHttpRequest()
httpRequest.onreadystatechange = function (data) {
// code
}
httpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded')
httpRequest.open('POST', url)
httpRequest.send('username=' + encodeURIComponent(username))
因为只要我使用建议的 jQuery(我想转换为 Vanilla JS 的那个),它就可以完美工作,所以一切都可以正常工作。因此,我假设页面的其余代码是不需要的(用于数据库连接和将用户数据保存到数据库的 PHP)。
最佳答案
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/setRequestHeader
When using setRequestHeader(), you must call it after calling open(), but before calling send().
var theUrl = 'saveUserData.php';
var httpRequest = new XMLHttpRequest();
httpRequest.onreadystatechange = function (data) {
};
httpRequest.open('POST', theUrl);
httpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
httpRequest.send({oauth_provider:'linkedin',userData: JSON.stringify(userData)}, function(data){ return true; });
关于javascript - jQuery AJAX 调用 Vanilla JS,我错过了什么?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53481912/