如何使用jQuery / Ajax基于变量更改成功函数的输出？

Question

On success, I would like to show different values depending on what value exists. For example, if $('#add').val() has a value in it I would like to show 'Video added" as part of the success function. If $('#remove').val() has a value in it, I would like to show 'Video removed' as part of the success function. Either #add or #remove will have a value in it at a given time. How do I enable this?

<script type="text/javascript">
   $(document).ready(function() {
       $("#test").submit(function(event){
       event.preventDefault();
            $.ajax({
                 type:"POST",
                 url:"/edit_favorites/",
                 data: {
                        'video_add': $('#add').val(), // from form
                        'video_remove': $('#remove').val() // from form
                        },
                 success: function(){
                     $('#message').html("<h2>Video added!</h2>") 
                    }
            });
            return false;
       });

    });
</script>

Answer 1

如果确定只有一个文本字段具有值，则可以执行以下操作：

$('#message').html('<h2>' + $('#add').val() !== '' ? 'Video added' : 'Video removed' + '!</h2>' )

Answer 2

if just checking text is enough you can use this code:

<script type="text/javascript">
   $(document).ready(function() {
       $("#test").submit(function(event){
       event.preventDefault();
            $.ajax({
                 type:"POST",
                 url:"/edit_favorites/",
                 data: {
                        'video_add': $('#add').val(), // from form
                        'video_remove': $('#remove').val() // from form
                        },
                 success: function(){
                     if ( $('#add').text() ) {
                        $('#message').html("<h2>Video added!</h2>");
                     } else if ( $('#add').text() ){
                        $('#message').html("<h2>Video removed!</h2>");
                     } else {
                        $('#message').html("<h2>Wasn't either add or remove!</h2>");
                     }
                    }
            });
            return false;
       });

    });
</script>

I assumed #add or #remove are text. The key is this if check:

if ( $('#add').text() ) {
   //... add is not empty because there is some text in it...

If #add or #remove may contain text or any other element, you can check them with :empty selector:

if ( !$('#add:empty').length ) {
   //... #add is not empty so something was added successfully ...

If #add or #remove are <input> elements like text box you can do the same check with:

if ( $('#add').val() ) {
   //... add is not empty ...

Answer 3

I like to return a response when the backend script has executed, XML would look something like this

 <status>true</status>
 <successMessage>Video deleted</successMessage>

or

<status>false</status>
<errorMessage>Video not found on the server</errorMessage>

Javascript

success: function (response) {
   if($(response).find("status").text()=="true"){
        $(".success").html($(response).find("successMessage").text());
        $(".success").show();
   }else{
        $(".error").html($(response).find("errorMessage").text());
        $(".error").show();
   }
}