I want to access my property bag using Javascript from a

          function getWebProperty() {

        var ctx = new SP.ClientContext.get_current();
        var web = ctx.get_site().get_rootweb();
        this.props =  web.get_allProperties();
        this.props.set_item('aProperty', 'it worked!');

        ctx.executeQueryAsync(Function.createDelegate(this, gotProperty), Function.createDelegate(this, failedGettingProperty));

    function gotProperty() {

    function failedGettingProperty() {

But I am getting an error saying " Object has no method 'get_rootweb'. I imagine this is because I haven't registered the sp.js library. If thats the problem, how would I register the sp.js library inside my elements.xml file? (Its all contained inside a element. If thats not the problem, is there a better way to access the property bag using javascript inside a element?

  • what is ctx.get_site() returning? Commented May 25, 2012 at 23:44

2 Answers 2


I agree with Derek's answer that you have a casing issue. Your issue should be solved by that. Regarding your second question: if you want to make sure that the sp.js is loaded on the page before your code executes, you can do that the following way through elements.xml:

   //Your JavaScript Code here.
  • Is there a way to access a specific propertybag as opposed to allproperties? Commented May 29, 2012 at 18:31
  • Sorry for the late reply but I am not really sure what you mean. Do you want to access the property bag of a specific web? Commented Jun 17, 2012 at 19:31
  • You can create your own custom property bag for your site collection. I am trying to access that property bag. I got it figured out, see the question sharepoint.stackexchange.com/questions/37198/… for more details Commented Jun 17, 2012 at 20:13

You have a casing issue. The correct format is


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