Personal blog written from scratch using Node.js, Bootstrap, and MySQL.
https://jrtechs.net
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66 lines
2.5 KiB
66 lines
2.5 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 posts rendered on each page
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* @param totalPosts - total posts 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 posts on each page
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* @param totalPosts -- total amount of posts 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)
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{
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return new Promise(function(resolve, reject)
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{
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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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var olderPosts = "";
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var newerPosts = "";
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if (isValidPage(previousPage, postsPerPage, totalPosts))
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{
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newerPosts = "<button class=\"btn btn-secondary btn-lg " +
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"w3-padding-large w3-white w3-border\" onclick=\"location.href='" +
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baseURL + "?page=" + previousPage +
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"'\"><b>Newer Posts »</b></button>";
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}
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if (isValidPage(nextPage, postsPerPage, totalPosts))
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{
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olderPosts = "<button class=\"btn btn-secondary btn-lg " +
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"w3-padding-large w3-white w3-border\" onclick=\"location.href='" +
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baseURL + "?page=" + nextPage +
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"'\"><b>Older Posts »</b></button>";
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}
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resolve(" <div class=\"row\">\n" +
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" <div class=\"col-6\">" + newerPosts + "</div>\n" +
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" <div class=\"col-6\"><span class=\"float-right\">" + olderPosts + "</span></div>\n" +
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" <br><br></div>");
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})
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}
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};
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