XsltListViewWebPart and custom link column

Question

I have a XsltListViewWebPart with a custom link column used for change a value on current listitem using JavaScript.

<a href="javascript:ApproveRejectRDA('{@ID}', true);" title="approve">

below javascript function...

function ApproveRejectRDA(id, approved) {
    var clientContext = SP.ClientContext.get_current();
    var oList = clientContext.get_web().get_lists().getByTitle('RDA');
    this.oListItem = oList.getItemById(id);

    if (approved == true)
       oListItem.set_item('NumStato', 16);
    else
       oListItem.set_item('NumStato', 17);

    oListItem.update();
    clientContext.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));
}

When I click on link, everything works properly only when the row is selected. If not, I get the following error:

Uncaught TypeError: Cannot read property 'get_current' of undefined

It seems that clientContext has no value.

Any ideas?

Thanks

Answer 1

It seems it occurs since sp.js library that contains SP.ClientContext class is not yet loaded when your code runs.

Use SP.SOD.executeFunc to ensure that the specified sp.js library is loaded when the code runs.

Try to change ApproveRejectRDA function to enclose it in SP.SOD.executeFunc like this:

function ApproveRejectRDA(id, approved) {
   SP.SOD.executeFunc('sp.js', 'SP.ClientContext', function(){
      var context = SP.ClientContext.get_current();
      //Your remaining code goes here...

   });
}

Answer 2

You need to create a new object for clientContext. You have missed the word "new" while creating the context.

Just change the first statement as follows,

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

Thanks.