javascript 在json中发送编码响应
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/7294830/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Sending encoding response in json
提问by MrFoh
I am using a lot of jQuery in a project am working on.
我在一个正在处理的项目中使用了很多 jQuery。
I have a javascript function that makes an ajax request to a controller which returns data in JSON.
我有一个 javascript 函数，它向控制器发出 ajax 请求，该控制器以 JSON 格式返回数据。
I would like to display a user friendly message informing the user that he/she has no information stored yet. But I'm confused as to how to send a response in JSON so my javascript function can determine whether the user has information to be displayed.
我想显示一条用户友好的消息，通知用户他/她尚未存储任何信息。但我对如何以 JSON 发送响应感到困惑，以便我的 javascript 函数可以确定用户是否有要显示的信息。
Here is my javascript function:
这是我的 javascript 函数：
function latest_pheeds() {
var action = url+"pheeds/latest_pheeds";
$('#pheed-stream').html('<div class="loading"></div>');
$('.loading').append('<img src="'+pheed_loader_src+'" />');
$.ajax({
url:action,
type:'GET',
dataType:'json',
error: function () {
},
success:function(data) {
$('.loading').fadeOut('slow');
$.each(data,function(index,item) {
$('#pheed-stream').append
(
'<div class="pheed" id="'+item.pheed_id+'">'+
'<p><a class="user_trigger" href="users/info/'+item.user_id+'">'
+item.user_id+'</a></p>'+
'<p>'+item.pheed+'</p>'+
'<div class="pheed_meta">'+
'<span>'+item.datetime+' Ago</span>'+
'<span class="cm">'+item.comments+
'<img class="comment_trigger" src="/pheedbak/assets/img/comment.png" title="Click to comment on pheed" onclick="retrieve_comments('+item.pheed_id+')">'+
'</span>'+
'<span>'+item.repheeds+
' Repheeds'+
'<img class="repheed_trigger" src="/pheedbak/assets/img/communication.png" title="Click to repheed" onclick="repheed('+item.pheed_id+')">'+
'</span>'+
'<span>'+
'Favourite'+
'<img class="favourite_trigger" src="/pheedbak/assets/img/star.png" title="Click to make this a favourite" onclick="favourite_pheed('+item.pheed_id+')" />'+
'</span>'+
'</div>'+
'</div>'
);
});
}
});
}
And heres the controller function the ajax request is made to
这里是控制器功能 ajax 请求
function latest_pheeds() {
//Confirm if a user is logged before allowing access
if($this->isLogged() == true) {
//load the pheed model for database interaction
$this->load->model('pheed_model');
//load user model
$this->load->model('user_model');
//load comment model
$this->load->model('comment_model');
//store the pheeds to a the $data variable
$data = $this->pheed_model->get_latest_pheeds();
//Load the date helper to calculate time difference between post time and current time
$this->load->helper('date');
//Current time(unix timetamp)
$time = time();
//pheeds
$pheeds = array();
if(count($data) > 0 ) {
foreach($data as $pheed) {
$row['pheed_id'] = $pheed->pheed_id;
$row['user_id'] = $this->user_model->return_username($pheed->user_id);
$row['pheed'] = $pheed->pheed;
$row['datetime'] = timespan($pheed->datetime,$time);
$row['comments'] = $this->comment_model->count_comments($pheed->pheed_id);
$row['repheeds'] = $pheed->repheeds;
$pheeds[] = $row;
}
echo json_encode($pheeds);
$response['response'] = "Ok";
$res[] = $response;
echo json_encode($res)."\n";
}
} else {
}
It generates the JSON output,but the syntax is broken so i cant read it with javascript, but once i get rid of the following code from the above method it works normally
它生成 JSON 输出，但语法已损坏，因此我无法使用 javascript 读取它，但是一旦我从上述方法中删除了以下代码，它就可以正常工作
$response['response'] = "Ok";
$res[] = $response;
echo json_encode($res)."\n";
回答by Andreas
You MUST only use json_encode($data) once in a response, if you want to output more stuff, you need to merge your data into one array and send that.
您只能在响应中使用 json_encode($data) 一次，如果您想输出更多内容，则需要将数据合并到一个数组中并发送。
EDIT: To be clear, one way you could do it is like this:
编辑：要清楚，你可以这样做的一种方法是这样的：
echo json_encode(array('pheeds' => $pheeds, 'res' => $res));
Then in JS you will get an array with the keys "pheeds" and "res".
然后在 JS 中，您将获得一个带有“pheeds”和“res”键的数组。
Although it may be of little practical significance, I would also recommend doing this before you echo the json encoded string:
虽然它可能没有什么实际意义，但我也建议您在回显 json 编码字符串之前执行此操作：
header('Content-Type: application/json');
