I have a form that is going to be executing a failry long running process. Not just long, but many small steps during an install process. I'm trying to stay away from using the built in MS AJAX as much as possible in my entire application, but will use it on this page if it's just the easier way to do things.
But what I want is to only one jQuery AJAX call to code behind and have code behind spit out progess as it hits each step. Here is what I've gotten so far. It's just sample code but it's what I'm trying to do.
UI:
<head runat="server">
<title></title>
<script type="text/javascript">
$(function() {
$(this).find("#submitForm").click(function() {
RunCodeBehind();
});
});
function RunCodeBehind() {
$.ajax({
error: function(msg) { alert(msg) },
type: "POST",
url: 'Other.aspx/RunLongRunningProcess',
data: "{}",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(responses) {
if (responses.d != "") {
//Display process in UI
var divEvents = document.getElementById("events");
divEvents.innerText = divEvents.innerText + "\n" + data;
}
else {
//no response, update as failed
var divEvents = document.getElementById("events");
divEvents.innerText = divEvents.innerText + "No response from code behind";
}
}
});
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<a id="submitForm">Start Process</a>
<br />
<div id="events"></div>
</div>
</form>
</body>
Code behind:
[WebMethod]
public static string RunLongRunningProcess()
{
string returnValue;
var sqlQuery = "SELECT COUNT(*) FROM Users;"; //generic sql query
returnValue = ExecuteQuery(sqlQuery);
//feedback cout total to UI, continue process
var sqlQueryInsert = @"INSERT INTO Log (UserCount)
SELECT COUNT(*) FROM Users;"; //generic sql insert
returnValue = ExecuteNonQuery(sqlQueryInsert);
//feedback insert step to UI
var sqlQuery = "SELECT user + ' - ' + name + ' - ' + favday FROM Users;"; //generic sql query
returnValue = ExecuteQuery(sqlQ开发者_JS百科uery);
//feedback selection to UI
return returnValue;
}
Any pointers on how to make it feed back to the UI more than once with just a single call?
I would be inclined to try the other way around, and poll another web service method from your JQuery code instead.
In your 'RunLongRunningProcess' method, I would simply update a session integer variable with values from 0 to 100.
Then I would create a separate web service method that returns the current value of this variable.
You can then poll this new method every (for example) second to get the current upload status.
I believe PeriodicalUpdater for JQuery will allow you to achieve this:
http://www.360innovate.co.uk/blog/2009/03/periodicalupdater-for-jquery/
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