I wanted to start a Nintex workflow by clicking a button. As a beginner I have been stuck on this subject for a few days and thought I should share my solution ! This should also be possible with a "regular" Sharepoint workflow.
I needed a button in my list which I could use to lend out or return a book. I wanted this button in my list to improve usability. I have used Steven Van Craen's advanced calculated field to insert a button in my list.
http://www.moss2007.be/blogs/vandest/archive/2009/03/31/advanced-computed-field.aspx
The code behind my button:
This code triggers a function in my webservice called SayHello.
It does not really matter which data type is used in this case I use json.
<HTML><![CDATA[
<script type="text/javascript">
function TriggerWorkflow(){
var vRootUrl = document.location.protocol + "//" + document.location.hostname + "/_vti_bin/Service1.svc/";
var id = SP.ListOperation.Selection.getSelectedItems()[0].id;
var parameter = $('#txtInput').val();
$.ajax(
{
cache: false,
type: "POST",
contentType: "application/json; charset=utf-8",
url: (vRootUrl + "SayHello"),
data: JSON.stringify({ id : id }),
dataType: "json",
success: function (data) {
alert('success');
},
error: function () {
alert('failed');
}
});
}
if(']]></HTML>
<field Name="Status" />
<HTML><![CDATA[' != 'Uitgeleend') {
document.write('<input type="button" value ="Leen uit" onclick="TriggerWorkflow();" />');
}
}
</script>]]></HTML>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;
namespace WcfService1
{
[ServiceContract]
public interface IService1
{
[OperationContract]
[WebInvoke(Method = "POST",
BodyStyle = WebMessageBodyStyle.Wrapped,
ResponseFormat = WebMessageFormat.Json,
RequestFormat = WebMessageFormat.Json)]
void SayHello(int id);
}
}
namespace WcfService1
{
// NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "Service1" in code, svc and config file together.
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
public class Service1 : IService1
{
public void SayHello(int id)
{
using (SPSite site = new SPSite("http://intranet/"))
{
using (SPWeb web = site.RootWeb)
{
SPList destination = web.Lists["Books_lend_out"];
SPList source = web.Lists["Books"];
SPListItem sourceList = source.GetItemById(id);
//'obtain an instance of SPWorkflowManager which will be used to start the workflow
var manager = site.WorkflowManager;
//'get all workflows associated with the list
var associationCol = source.WorkflowAssociations;
//'iterate through all the workflow and lookup for the workflow to be started
foreach (SPWorkflowAssociation association in associationCol)
{
if (association.Name == "New Loan")
{
//'get workflow association data
var assData = association.AssociationData;
//'start the workflow
web.AllowUnsafeUpdates = true;
manager.StartWorkflow(sourceList, association, assData);
web.AllowUnsafeUpdates = false;
}
}
}
}
}
}
}
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