How to redirect user to first accessible child-subsite from parent-site

Question

I would like to find a way how to redirect each user to first accessible subsite in SharePoint 2013.

I have an example of sites' structure:

• MAIN SITE (homepage with links to sites)
  • Site1
    -Subsite1 -Subsite2 -Subsite3 -Subsite4
  • Site2
    -Subsite5 -Subsite6 -Subsite7
  • Site3
    -Subsite8 -Subsite9 -Subsite10 -Subsite11 -Subsite12

I need to automatically redirect SP user from Site1 to Subsite1 or (if user has no permissions to subsite1) Subsite2 (or) Subsite3 (or) Subsite4.

This solution should be implemented on each site (1,2,3).

Can somebody help me?

EDIT:

I have now a trouble with executing code (function runCode()):

var webCollection = null;

function runCode() {
    var clientContext = new SP.ClientContext.get_current();
    if (clientContext != undefined && clientContext != null) {
        var web = clientContext.get_web();
        this.webCollection = web.getSubwebsForCurrentUser(null);
        clientContext.load(this.webCollection);
        clientContext.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));
    }
}

function onQuerySucceeded() {
    var webName = "";
    var webEnumerator = this.webCollection.getEnumerator();
    webEnumerator.moveNext();
        var web = webEnumerator.get_current();
        webName += web.get_title(); 
    window.location.href = "http://sharepoint/sites/m1/s/" + webName;
}

function onQueryFailed(sender, args) {
    alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}

Answer 1

You could check SharePoint REST API to make ajax request and perform your expected behavior.

https://msdn.microsoft.com/en-us/library/office/dn499819.aspx#bk_WebGetSubwebsFilteredForCurrentUser

You could also take time to learn how to use JSOM API to do the same think (but too heavy to implement if you have not a friendly framework :)

https://msdn.microsoft.com/en-us/library/office/jj246242.aspx

Hope it helps :)

Answer 2

It works fine for me:

var clientContext = SP.ClientContext.get_current();
var contextWeb = clientContext.get_web();
var webCollection = contextWeb.getSubwebsForCurrentUser(null);
clientContext.load(webCollection);

clientContext.executeQueryAsync(
    function () {
        // console.log('success :)');
        var webEnumerator = webCollection.getEnumerator();
        var subsites = [];
        while (webEnumerator.moveNext()) {
            var web = webEnumerator.get_current();
            var title = web.get_title();
            var url = web.get_url()
            var logoUrl = web.get_siteLogoUrl();
            var description = web.get_description();

            subsites.push({url: url, title: title, description: description, logoUrl: logoUrl});
        }
        // console.log(subsites)
        // do stuff to reorder
        var firstSiteUrl = subsites[0].url;
        // do stuff to redirect
        // console.log(firstSiteUrl);
    },
    function () {
        // log failure
        // console.log('error :(');
    }
);

Answer 3

Finally I get a fully worked solution on each site in SharePoint.

It needs to be pasted in default.aspx under the tag:

<asp:Content ContentPlaceHolderId="PlaceHolderAdditionalPageHead" runat="server">

Here is the js code:

<script type = "text/javascript" >

var webCollection = null;

function runCode() {
    var clientContext = new SP.ClientContext.get_current();
    if (clientContext != undefined && clientContext != null) {
        var web = clientContext.get_web();
        this.webCollection = web.getSubwebsForCurrentUser(null);
        clientContext.load(this.webCollection);
        clientContext.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));
    }
}

function onQuerySucceeded() {
    var webName = "";
    var webEnumerator = this.webCollection.getEnumerator();
    webEnumerator.moveNext();
    var web = webEnumerator.get_current();
    webName += web.get_url(); 
    window.location.href = webName;
}

function onQueryFailed(sender, args) {
    alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}
window.setTimeout(function(){runCode()},0);


</script>   

IMPORTANT!

I must notice that first subsite is the first created subsite.

If somebody moves the hyperlinks in top navigation bar, it doesn't matter for above redirection method - it always moves to the first created (by admin or developer) subsite!