Here is what I did in my project:

<asp:Content ContentPlaceHolderID="PlaceHolderAdditionalPageHead" runat="server">
<script type="text/javascript">
  alert("before");
  //It can not work cause the LIST is in the subsite called "Service"
  //var clientContext = SP.ClientContext.get_current();
  var context =new SP.ClientContext("http://sp2010dev1:88/Service/");
  alert(context );  
</script>
</asp:Content>

But, the alert(context) can not execute ,when I check the concole it showed me TypeError: SP.ClientContext is not a constructor,that is to say there was something wrong with the initialization of ClientContext. Why? How can I get ClientContext? Or was it caused by the lacking of SP.js?

My Final Solution is : Add this statement to the masterpage: ,and then everything works good! May this can help you.

Here is what I did in my project:

<asp:Content ContentPlaceHolderID="PlaceHolderAdditionalPageHead" runat="server">
<script type="text/javascript">
  alert("before");
  //It can not work cause the LIST is in the subsite called "Service"
  //var clientContext = SP.ClientContext.get_current();
  var context =new SP.ClientContext("http://sp2010dev1:88/Service/");
  alert(context );  
</script>
</asp:Content>

But, the alert(context) can not execute ,when I check the concole it showed me TypeError: SP.ClientContext is not a constructor,that is to say there was something wrong with the initialization of ClientContext. Why? How can I get ClientContext? Or was it caused by the lacking of SP.js?

My Final Solution is : Add this statement to the masterpage: ,and then everything works good! May this can help you.

• javascript
• sharepoint
• sharepoint-2010

2 Answers 2

Instead of writing directly in the <script> blocks try to insert in the function and call that function on body load.

Another good way is call using the jquery

$(document).ready()(function(){
var context =new SP.ClientContext("http://sp2010dev1:88/Service/");
  alert(context );  

});

Try this once, even if it is not working then will try to find another solution.

Along with this as per steve suggestion, include first sp.js and perform remaining things.

Yes, it probably is because SP.js is not loaded. Try this:

<SharePoint:ScriptLink runat="server" Name="SP.js" Localizable="false" OnDemand="False" LoadAfterUI="True"></SharePoint:ScriptLink>
<script type="text/javascript">
    ExecuteOrDelayUntilScriptLoaded(function () {
        /* your code here */;
    }, "sp.js");
</script>