Personal blog written from scratch using Node.js, Bootstrap, and MySQL.
https://jrtechs.net
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52 lines
1.7 KiB
52 lines
1.7 KiB
/**
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* Determines if the requested page is out of bounds
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*
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* @param page current page
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* @param postsPerPage - number of blog rendered on each page
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* @param totalPosts - total blog in this category/total
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* @returns {boolean} if this is a valid page
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*/
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const isValidPage = function(page, postsPerPage, totalPosts)
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{
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return !(page === 0 || page -1 >= totalPosts/postsPerPage);
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};
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module.exports=
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{
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/**
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* Renders two buttons on the bottom of the page to
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* go to the left or right
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*
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* Used by the home page and categories pages
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* @param baseURL -- base url of page being rendered
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* @param currentPage -- current page being rendered
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* @param postsPerPage -- number of blog on each page
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* @param totalPosts -- total amount of blog in the category
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* @returns {Promise} promise which renders the buttons
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*/
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main: function(baseURL, currentPage, postsPerPage, totalPosts, templateContext)
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{
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if(typeof currentPage == "undefined")
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currentPage = 1;
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currentPage = Number(currentPage);
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if(!isValidPage(currentPage, postsPerPage, totalPosts))
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{
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reject("Invalid Page");
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}
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var nextPage = currentPage + 1;
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var previousPage = currentPage - 1;
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if (isValidPage(previousPage, postsPerPage, totalPosts))
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{
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templateContext.newPostsURL = baseURL + "?page=" + previousPage;
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}
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if (isValidPage(nextPage, postsPerPage, totalPosts))
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{
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templateContext.oldPostsURL = baseURL + "?page=" + nextPage
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}
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}
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};
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