AJAX sending data to laravel controller and it is not working - ajax

Question

I am trying to send user slug to my laravel controller and its not working
here is my html code :
<a class="card" onclick="chat_send($data = '{{$user->slug}}');">
here is my script :
function chat_send(){
var data = $data;
var action_url = '{{ route('chat.show','data')}}';
$.ajax({
type : "POST",
url : action_url,
data : {data:data},
dataType : "json",
success:function(data){
if(data.errors){
alert('Message Field is Empty.');
}
if(data.success){
alert('Success');
}
}
});
};
controller code :
public function show(Request $request)
{
$slug = $request->get('data');
return view('chat',compact('slug'));
// return view('test');
}
this is the error I got :
Console log

Answer 1

Just do this error will be resolved.
<a class="card" onclick="chat_send('{{$user->slug}}');">
And in script:
function chat_send(data){
var action_url = '{{ route('chat.show','data')}}';
$.ajax({
type : "POST",
url : action_url,
data : {data:data},
dataType : "json",
success:function(data){
if(data.errors){
alert('Message Field is Empty.');
}
if(data.success){
alert('Success');
}
}
});
};

Answer 2

try like below:
<a class="card" id="card" data = '{{$user->slug}}'>
Use JQuery for sending ajax:
$(document).ready(function(){
$('#card').click(function(){
var data = $(this).attr(data)
var action_url = '{{ route('chat.show','data')}}';
$.ajax({
type : "POST",
url : action_url,
data : {data:data},
dataType : "json",
success:function(data){
if(data.errors){
alert('Message Field is Empty.');
}
if(data.success){
alert('Success');
}
}
});
};
})
})