Synchronous and Asynchronous Calls with the AJAX Toolkit
The AJAX Toolkit allows you to issue synchronous or asynchronous calls. Asynchronous calls allow the client side process to continue, waiting for a call back from the server. To issue an asynchronous call, you must include an additional parameter with the API call, referred to as a callback function. Once the result is ready, the server invokes the callback method with the result.
VF Page:
<apex:page>
<head>
<script src="/soap/ajax/20.0/connection.js" type="text/javascript"></script>
<script>
window.onload = function() {
var AccountOutput = document.getElementById("AccountOutput");
var StartTime = new Date().getTime()
try {
sforce.connection.sessionId = "{!$Api.Session_ID}"; //Used for Session out
var queryResult = sforce.connection.query("Select Name, Industry From Account where Name!=null");
AccountResults(queryResult, AccountOutput, StartTime);
} catch(error) {
queryFailed(error, AccountOutput);
}
}
//if failed for Query
function queryFailed(error, out) {
out.innerHTML = "<font color=red>An error has occurred:</font> <p>" + error;
}
//if gets Results and pass to 'out' variable
function AccountResults(queryResult, out, startTime) {
var timeTaken = new Date().getTime() - startTime;
if (queryResult.size > 0) {
var AccountOutput = "";
var records = queryResult.getArray('records');
for (var i = 0; i <records.length; i++) {
var account = records[i];
AccountOutput += account.Name + " [Industry - "+ account.Industry + " ]<BR>";
}
out.innerHTML = AccountOutput + "<BR> query complexed in: " + timeTaken + " ms.";
} else {
out.innerHTML = "No records matched.";
}
}
</script>
</head>
<body>
<div id="AccountOutput">
</div>
</body>
</apex:page>
Synchronous syntax:
sforce.connection.method("arg1","arg2", ...);
For example:
sforce.connection.login("MyName@MyOrg.com","myPassword1");
Asynchronous syntax:
method("arg1","arg2", ..., callback_method);
For example:
var callback = {onSuccess: handleSuccess, onFailure: handleFailure};
function handleSuccess(result) {}
function handleFailure(error) {}
sforce.connection.query("Select name from Account", callback);
VF Page:
<apex:page>
<head>
<script src="/soap/ajax/20.0/connection.js" type="text/javascript"></script>
<script>
window.onload = function() {
var AccountOutput = document.getElementById("AccountOutput");
var StartTime = new Date().getTime()
try {
sforce.connection.sessionId = "{!$Api.Session_ID}"; //Used for Session out
var queryResult = sforce.connection.query("Select Name, Industry From Account where Name!=null");
AccountResults(queryResult, AccountOutput, StartTime);
} catch(error) {
queryFailed(error, AccountOutput);
}
}
//if failed for Query
function queryFailed(error, out) {
out.innerHTML = "<font color=red>An error has occurred:</font> <p>" + error;
}
//if gets Results and pass to 'out' variable
function AccountResults(queryResult, out, startTime) {
var timeTaken = new Date().getTime() - startTime;
if (queryResult.size > 0) {
var AccountOutput = "";
var records = queryResult.getArray('records');
for (var i = 0; i <records.length; i++) {
var account = records[i];
AccountOutput += account.Name + " [Industry - "+ account.Industry + " ]<BR>";
}
out.innerHTML = AccountOutput + "<BR> query complexed in: " + timeTaken + " ms.";
} else {
out.innerHTML = "No records matched.";
}
}
</script>
</head>
<body>
<div id="AccountOutput">
</div>
</body>
</apex:page>
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