页面加载Javascript之前无法添加到DOM内容

Question

I am currently trying to add a bunch of elements to a list using javscript after querying from parse.

I am able to get the full list if I don't add any click listeners, however if I do add click listeners, only the first 5 items appear in the list.

Here is the code in my javascript file, it is called first in the html:

if (!Parse.User.current()){
    window.location.href = 'index.html';
}
else {
    getParticipants();
}

$( document ).ready(function() {


$('#sign-out').click(function(){
    Parse.User.logOut();
    window.location.href = 'index.html';
    });

});

function getParticipants (){
var Participants = Parse.Object.extend("Participants");
var query = new Parse.Query(Participants);
query.ascending("patientID");
query.find({
    success: function(results) {
        for (var i = 0; i < results.length; i++) {
            var object = results[i];
            var id = object.get("patientID");
            $(".list-group").append("<li class='list-group-item' id='" + id + "'>" + id + "</li>");
            (function (id) {
                $('#' + object.get("patientID")).click(function (e) {
                    e.preventDefault();

                    if (typeof(Storage) !== "undefined") {
                        localStorage.setItem("patientID", id);
                    } else {
                        // Sorry! No Web Storage support..
                    }

                    window.location = 'profile.html';
                });
            }(id));
        }
    },
    error: function(error) {
        alert("Error: " + error.code + " " + error.message);
    }
});

}

Answer 1

You can never modify the DOM before the page loads because at that point the DOM isn't ready.

Any DOM manipulation should be done after onload event is fired.