GET request

/_api/Web?$select=CustomMasterUrl,MasterUrl

function MastePageChange() {
    var clientcontext;
    var cweb;
    var customMasterURL = '/_catalogs/masterpage/NewMasterPage.master';
    clientcontext = new SP.ClientContext.get_current();
    cweb = clientcontext.get_web();
    cweb.set_customMasterUrl(masterPageUrl);
    cweb.set_masterUrl(masterPageUrl);
    cweb.update();
    clientcontext.executeQueryAsync(function() {
        alert("Master Page has been changed successfully \n" + customMasterURL);
    }, function(sender, args) {
        alert("Error: " + args.get_message());
    });
}

MastePageChange();

In 2013, we can’t modify the master page .master. We need to modify the .html file associated with the master page.

We have to modify .html
 <!--MS:--> and <!--ME:--> that shows the markup inside of the tags for the  masterpage


Search for text in html file “<div class =”ms-belltown-anonshow”>” tag

When user add URL  IsDlg=0, IsDlg=1
Add &IsDlg=1

hidden Ribbon bar 
Add &IsDlg=0

but there’s no scroll bars


<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

<script type="text/javascript">

_spBodyOnLoadFunctionNames.push("hideItAll");

function hideItAll(){
    if(window.location.search.toLowerCase().indexOf("isdlg=1") > 0){
        $("#s4-ribbonrow").hide(); //ribbon bar

        //because the bar joins us late in the game, we need to throw CSS in to hide it
        $("head").append("<style>#Hero-WPQ2 { display:none }</style>");

        $("#CSRListViewControlDivWPQ2").hide(); //views and search bar
    }
}
</script>

Add the below lines in the MasterPage in SharePoint

<!--SPM:<SharePoint:AjaxDelta id="DeltaPlaceHolderLeftNavBar" BlockElement="true" runat="server">-->
<!--SPM:<asp:ContentPlaceHolder id="PlaceHolderLeftNavBar" runat="server">-->
<!--SPM:</asp:ContentPlaceHolder>-->
<!--SPM:</SharePoint:AjaxDelta>-->
<!--SPM:<SharePoint:AjaxDelta id="DeltaPlaceHolderPageTitleInTitleArea" runat="server">-->
<!--SPM:<asp:ContentPlaceHolder id="PlaceHolderPageTitleInTitleArea" runat="server">-->
<!--SPM:</asp:ContentPlaceHolder>-->
<!--SPM:</SharePoint:AjaxDelta>-->

In this post, site logo change to root site

1.Open you master page

For this generte site logo in Snippet Gallery

2.Find the text SharePoint:SPSimpleSiteLink
<!--MS:<SharePoint:SPSimpleSiteLink runat="server" CssClass="ms-siteicon-a" ID="x7917ecc8c38eab54c8c8d4bd69f58e33">-->
... 
<!--ME:</SharePoint:SPSimpleSiteLink>-->

3.Replace the text


<!--MS:<SharePoint:SPLinkButton runat="server" NavigateUrl="~sitecollection/" CssClass="ms-siteicon-a" ID="x7917ecc8c38d4bd69f5afkaf932523">-->
...

<!--ME:</SharePoint:SPLinkButton>-->


4.For site collection redirect option, Add the attribute NavigateUrl to this tag and set it value to "~sitecollection"
4.For site current site redirect option, Add the attribute NavigateUrl to this tag and set it value to "~site"

NavigateUrl="~sitecollection/"
NavigateUrl="~site/"