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    <p>MVC design would suggest rendering Next &amp; Prev URLS on the server, which knows how many pages there are in total;</p> <p>Or at least rendering a pre-prepared 'base URL' and 'pageCount' into JS variables, so producing a valid URL is trivial in Javascript.</p> <p>An example in JSP:</p> <pre><code>&lt;script type='text/javascript'&gt; var baseUrl = ${baseUrl}; var numPages = ${numPages}; var currPage = ${currPage}; function changePage (delta) { var newPage = ((currPage + delta) % numPages); // 0-based. var newUrl = baseUrl + newPage + ".html"; // var newUrl = baseUrl + newPage; window.location = newUrl; } $(document).load( function(){ $(".leftArrow a").click( function(){ changePage(-1)}); $(".rightArrow a").click( function(){ changePage(+1)}); }); </code></pre> <p>If your page-numbers are 1-based, the % 'modulus' expression either has to be more complex (subtract 1 beforehand, add 1 after) or you can do an if statement.</p> <pre><code> function changePage (delta) { // 1-based PageNumber version. var newPage = currPage + delta; if (newPage &lt;= 0) newPage = numPages; if (newPage &gt; numPages) newPage = 1; // ... as before. </code></pre> <p>Or via modulo:</p> <pre><code> var newPage = ((currPage-1 + delta) % numPages) + 1; </code></pre> <p>Pick which you find clearest &amp; most maintainable, if you were coming back to the code in 2 years time!</p> <p><strong>[Edited]</strong> If no server-side smarts at all, just put <em>constants</em> into the JS. You can also separate the constants/or calculation of base-URL, from the active part of the script.. thus making it reusable across several pages.</p>
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    1. POprev / next nav codes to be more efficient and flexible
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    1. COthanks for your comment and the example codes. It is clearly shorter and much simpler. Thank you! I have few questions. function changePage (int delta) <-- does this simply mean integer number? What does this delta mean here and where this number gets assigned? var newPage = (currPage + delta) % numPages; $(".rightArrow a").click( function(){ changePage(+1)}); <-- does this take care of the situation if there are only index1 and index2, right arrow URL goes to index1.html?
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    2. COWhoops, no 'int' required in Javascript. +1 is next page, -1 is previous page. Page numbering works best 0-based with % modulus operator.. but I'll edit the answer.
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    3. COthank you! I will be coming back to the same code in one year :-) Thanks for your edits again. I really appreciate it.
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