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Simple pagination JS script. Paginator class is 100 lines of JavaScript code to paste into your project and easily handle an array of elements.
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| class Paginator { | |
| constructor({ | |
| elements, | |
| cellsPerRow = 5, | |
| rowsPerPage = 4, | |
| renderFunc, | |
| prevBtn, | |
| nextBtn, | |
| firstBtn, | |
| lastBtn, | |
| }) { | |
| this.elements = elements; | |
| this.currentPage = 0; | |
| this.cellsPerRow = cellsPerRow; | |
| this.rowsPerPage = rowsPerPage; | |
| this.renderFunc = renderFunc; | |
| this.prevBtn = prevBtn; | |
| this.nextBtn = nextBtn; | |
| this.firstBtn = firstBtn; | |
| this.lastBtn = lastBtn; | |
| if (this.prevBtn != undefined) | |
| this.prevBtn.onclick = () => this.goToPrevPage(); | |
| if (this.nextBtn != undefined) | |
| this.nextBtn.onclick = () => this.goToNextPage(); | |
| if (this.firstBtn != undefined) | |
| this.firstBtn.onclick = () => this.goToFirstPage(); | |
| if (this.lastBtn != undefined) | |
| this.lastBtn.onclick = () => this.goToLastPage(); | |
| } | |
| render() { | |
| if (this.currentPage == 0) { | |
| this.prevBtn?.setAttribute("disabled", ""); | |
| this.firstBtn?.setAttribute("disabled", ""); | |
| } else { | |
| this.prevBtn?.removeAttribute("disabled", ""); | |
| this.firstBtn?.removeAttribute("disabled", ""); | |
| } | |
| if (this.currentPage == this.lastPage || this.lastPage == 0) { | |
| this.nextBtn?.setAttribute("disabled", ""); | |
| this.lastBtn?.setAttribute("disabled", ""); | |
| } else { | |
| this.nextBtn?.removeAttribute("disabled", ""); | |
| this.lastBtn?.removeAttribute("disabled", ""); | |
| } | |
| this.renderFunc(this.currentElements); | |
| } | |
| getCurrentPageInfo(messageGeneratorFunc) { | |
| return messageGeneratorFunc({ | |
| count: this.cellsPerPage, | |
| curr: this.currentPage + 1, | |
| last: this.lastPage + 1, | |
| }); | |
| } | |
| goToPrevPage() { | |
| if (this.currentPage > 0) { | |
| this.currentPage--; | |
| this.render(); | |
| } | |
| } | |
| goToNextPage() { | |
| if (this.currentPage < this.lastPage) { | |
| this.currentPage++; | |
| this.render(); | |
| } | |
| } | |
| goToFirstPage() { | |
| this.currentPage = 0; | |
| this.render(); | |
| } | |
| goToLastPage() { | |
| this.currentPage = this.lastPage; | |
| this.render(); | |
| } | |
| get cellsPerPage() { | |
| return this.rowsPerPage * this.cellsPerRow; | |
| } | |
| get lastPage() { | |
| return Math.floor(this.elements.length / this.cellsPerPage); | |
| } | |
| get currentElements() { | |
| let next_pos = this.currentPage * this.cellsPerPage; | |
| let table = Array(this.rowsPerPage).fill(Array()); | |
| for (const i in table) { | |
| table[i] = Array(this.cellsPerRow); | |
| } | |
| for (let i = 0; i < this.rowsPerPage; i++) { | |
| for (let j = 0; j < this.cellsPerRow; j++) { | |
| if (next_pos < this.elements.length) { | |
| table[i][j] = this.elements[next_pos]; | |
| next_pos++; | |
| } | |
| } | |
| } | |
| return table; | |
| } | |
| } |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <!-- necessary html headers --> | |
| <script src="./pagination.js"></script> | |
| </head> | |
| <body> | |
| <div class="tablecontainer"> | |
| <h1 id="msg"></h1> | |
| <table id="maintable"></table> | |
| </div> | |
| <div class="inputscontainer"> | |
| <button class="btn" id="first">First</button> | |
| <button class="btn" id="prev">Previous</button> | |
| <button class="btn" id="next">Next</button> | |
| <button class="btn" id="last">Last</button> | |
| </div> | |
| </body> | |
| <script> | |
| function renderTable(currentElements) { | |
| // Example of render... | |
| let tableContent = "<tr>"; | |
| for (const row of currentElements) { | |
| for (const cell of row) { | |
| tableContent += `<td>${cell == undefined ? ' ' : cell}</td>`; | |
| } | |
| tableContent += "</tr><tr>"; | |
| } | |
| tableContent += "</tr>"; | |
| document.getElementById("maintable").innerHTML = tableContent; | |
| } | |
| window.onload = () => { | |
| let prevBtn = document.getElementById("prev"); // Introduce btn ID | |
| let nextBtn = document.getElementById("next"); // Introduce btn ID | |
| let firstBtn = document.getElementById("first"); // Introduce btn ID | |
| let lastBtn = document.getElementById("last"); // Introduce btn ID | |
| var paginator = new Paginator({ | |
| elements: [2, 3, 65, "sd", "dfo", "95j", 3], | |
| cellsPerRow: 5, | |
| rowsPerPage: 4, | |
| renderFunc: renderTable, // renderFunc must be a func that receives elements to render | |
| prevBtn: prevBtn, | |
| nextBtn: nextBtn, | |
| firstBtn: firstBtn, | |
| lastBtn: lastBtn, | |
| }); | |
| var currentElements = paginator.currentElements; | |
| var currentPage = paginator.currentPage; | |
| var lastPage = paginator.lastPage; | |
| var pageInfo = paginator.getCurrentPageInfo(({count, curr, last}) => `${count} items | Page ${curr} of ${last}`); | |
| }; | |
| </script> | |
| </html> |
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