link de verificação do js se existir
//checking link
function urlExists(url, callback) {
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function () {
if (xhr.readyState === 4) {
callback(xhr.status < 400);
}
};
xhr.open('HEAD', url);
xhr.send();
}
// run function
function check_link(url) {
urlExists(url, function (exists) {
if (exists) {
console.log('"%s" exists?', url, exists);
}
});
}
Ivan Cuaco