Checking URL fragment for a keyword

Question

i use the following to take a URL e.g. domain.com/#2 and then i use that fragment to redirect the users to domain.com/?page=2.

However, sometimes the user may be shown j

Answer 1

First set a global variable for the page number; then check if the "page" query string variable is set and is numeric (source).

var pageNum = 0;

function getParameterByName(name) {
    name = name.replace(/[\[]/, "\\[").replace(/[\]]/, "\\]");
    var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),
        results = regex.exec(location.search);
    return results == null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));
}

if(!isNaN(getParameterByName('page'))) pageNum += parseInt(getParameterByName('page'));

Then check window.location.hash for the hash. If it is numeric, add it to pageNum. Else check if it is a command.

    if(!isNaN(parseInt(window.location.hash.replace(/#/, '')))) {
    pageNum += parseInt(window.location.hash.replace(/#/, ''));
} else if(window.location.hash != null) {
    switch(window.location.hash) {
        case "feedback":
            window.location.href = 'domain.com/feedback';
            break;
        default: 
            // do nothing?
            break;
    }
}

Finally, redirect the user if pageNum > 0.

if(pageNum > 0) window.location.href = 'domain.com/?page=' + pageNum;

Complete code:

var pageNum = 0;

function getParameterByName(name) {
    name = name.replace(/[\[]/, "\\[").replace(/[\]]/, "\\]");
    var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),
        results = regex.exec(location.search);
    return results == null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));
}

if(!isNaN(getParameterByName('page'))) pageNum += parseInt(getParameterByName('page'));

if(!isNaN(parseInt(window.location.hash.replace(/#/, '')))) {
    pageNum += parseInt(window.location.hash.replace(/#/, ''));
} else if(window.location.hash != null) {
    switch(window.location.hash) {
        case "feedback":
            window.location.href = 'domain.com/feedback';
            break;
        default: 
            // do nothing?
            break;
    }
}

if(pageNum > 0) window.location.href = 'domain.com/?page=' + pageNum;