subscribe inside forloop would not trigger call back

[xingguo3]

STOMP over ws connection and send to topic are normal.

//1. in js, the subscribe could only trigger the latest callback
// console output only print "callback 3"
for(var i= 0;i<4;i++){
client.subscribe("/topic/topicid_"+i, function(message){
console.log("callback " + i);
});
}

// 2. if subscribe one by one, could get all console output
client.subscribe("/topic/topicid_"+0, function(message){
console.log("callback " + 0);
});
client.subscribe("/topic/topicid_"+1, function(message){
console.log("callback " + 1);
});
client.subscribe("/topic/topicid_"+2, function(message){
console.log("callback " + 2);
});
client.subscribe("/topic/topicid_"+3, function(message){
console.log("callback " + 3);
});

any idea or solution to solve this issue?

[ryanvs]

The issue is the use of a JavaScript closure inside the for loop. You defined the local variable i in the loop, so it will use the last value only. Please see https://stackoverflow.com/questions/750486/javascript-closure-inside-loops-simple-practical-example for more information.