Common code requirements in SharePoint Javascript Object Model

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Introduction

In this post we will check some common codes used in SharePoint JavaScript Object Model.
The post includes

Getting current site object
Getting current web object
Getting current web full url
Getting current list name and id
Getting current list selected items

Skill Level – Medium

Common Utility Codes

var context = SP.ClientContext.get_current();
this.site = context.get_site();		// Current Site Object
this.web	 = context.get_web();		// Current Web Object
context.load(this.site);
context.load(this.web);
context.executeQueryAsync(
	Function.createDelegate(this, this.onQuerySucceeded),
   
);

function onQuerySucceeded() 
{
	var lstGuid = SP.ListOperation.Selection.getSelectedList();  // List GUID of the current list
	var listname = "";		// if the List GUID is null try getting the List Name
	if (lstGuid == null) {
		listname = $(".s4-titletext h2 a:first").html(); //requires JQuery to get list name from ribbon breadcrumb
	}

   
	var items = SP.ListOperation.Selection.getSelectedItems();  // get selected items of the list
	var itemCount = CountDictionary(items);  // get selected items count

	//Get Current Web Full Url
	var webFullUrl = "";
	if (site.get_serverRelativeUrl() == "/") {
		webFullUrl = site.get_url() + web.get_serverRelativeUrl();
	}
	else {
		webFullUrl = site.get_url().replace(site.get_serverRelativeUrl(), web.get_serverRelativeUrl());
	}

}