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