GetWebIDWithJavaScript.js

GetWebIDWithJavaScript.js

<script>
	ExecuteOrDelayUntilScriptLoaded(PageLoad, "sp.js");
	function PageLoad() {
		debugger;
		this.ctx = SP.ClientContext.get_current();
		this.web = ctx.get_web();
		this.ctx.load(this.web);
		ctx.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));
	}
	function onQuerySucceeded() {
		debugger;
		alert(this.web.get_id());
	}
	function onQueryFailed(sender, args) {
		alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
	}
</script>