Checking for duplicates from a SharePoint input form, client side javascript

Question

Folks, I have a custom button on SharePoint form with an onClick event that is as follows:

onclick="if (!itemDuplicated()){ddwrt:GenFireServerEvent('__commit;__redirectsource')}; window.alert('Item updated.') ; window.close();"

The script to handle the click event is as follows:

                function itemDuplicated(){


                        var field1 = document.getElementById(&quot;ctl00_m_g_7d2eac47_1ef1_4ab4_96b7_38089fea54a1_ff21_ctl00_ctl00_TextField&quot;).value;

                    var siteUrl = &apos;http://myurl&apos;;

                    var clientContext =  new SP.ClientContext.get_current();

                    var oList = clientContext.get_web().get_lists().getByTitle(&quot;RFC Field Grouping (kerry test of concept)&quot;);

                    var camlQuery = new SP.CamlQuery();
                    camlQuery.set_viewXml(&apos;<View><Query><Where><Eq><FieldRef Name='field1'/><Value Type='Text'>&apos; + field1 + &apos;</Value></Eq></Where></Query></View>&apos;);

                    this.collListItem = oList.getItems(camlQuery);                          

                    clientContext.load(collListItem, &apos;Include(Title)&apos;);

                    clientContext.executeQueryAsync(Function.createDelegate(this, this.onListItemsLoadSuccess),Function.createDelegate(this, this.onQueryFailed));

                }  //end function

in the this.onListItemsLoadSuccess function I am easily able to get the value I need from the caml query but because it is running Async it never gets considered and the itemDuplicated function always returns false.

I have read a lot about this and how it's a difficult thing to accomplish, making asynchronous calls synchronous (not recommended) and using callbacks, etc

I have tried a bunch of different things to no avail. Is there any way to accomplish this?

Magnus Danielson · Accepted Answer · 2017-11-28 20:39:23Z

0

Change the onclick event to just call your function

onclick="itemDuplicated()"

Then rewrite the onListItemsLoadSuccess function to handle your if statement

function onListItemsLoadSuccess()
{
   //Check if duplicated and then run code if we have duplicate
}

answered Nov 28, 2017 at 20:39

Magnus Danielson

1914 bronze badges

Thanks so much for taking the time to answer. This is a great suggestion and one I had explored initially. However, the problem I ran into was trying to submit the form with javascrpt. I.e. If no duplicates were found, then I want to simply submit the form. Plugging GenFireServerEvent('__commit;__redirectsource') into the javascript didn't work...nor did the standard document.forms[0].submit() or document.getElementByID("aspnetForm).submit() This is such a simple thing but yet it is so difficult to accomplish. Any suggestion? Thanks again.

Kerry
– Kerry

2017-11-29 14:39:28 +00:00
Commented Nov 29, 2017 at 14:39
ddwrt:GenFireServerEvent probably goes out of scope depending on how you wire the async callback. Try storing the function ddwrt:GenFireServerEvent in a variable you can reach from onListItemsLoadSuccess() function. If you just want to try it out and play ugly you can do: window["myfunc"] = ddwrt:GenFireServerEvent; And then call it with: window.myfunc('__commit;__redirectsource')

Magnus Danielson
– Magnus Danielson

2017-11-29 20:50:24 +00:00
Commented Nov 29, 2017 at 20:50

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