How to get SPSite aka SPWeb property bags using ClientContext? [duplicate]

Question

Possible Duplicate:
Grab a specific property bag using ECMA script

I would appreciate if some paste a sample code to get the property bags values using ClientContext?

Answer 1

There was recent discussion here regarding the very same topic. Refer to this thread: Grab a specific property bag using ECMA script

Answer 2

Just to complete the answer provided in the link. If your property bag value is a plain text, not a serialized xml settings (as in the other question), you can use get_item function directly:

function getWebPropertyValue(key) {
    var ctx = SP.ClientContext.get_current()
    var web = ctx.get_web()
    var props = web.get_allProperties()
    ctx.load(props)
    ctx.executeQueryAsync(function() {
        var value = props.get_item(key);
        alert(value);
    }, function() {alert("failed");})
}

//test
getWebPropertyValue("vti_approvallevels");