问题
I am generating pdf from jsPDF api , I want to add footer to each page with page number .
How to achieve this . It is having option of adding footer from fromHTML plugin , but I am writing without HTML.
var doc = new jsPDF("portrait","px","a4");
回答1:
You have to implement it yourself. You can do something like this:
var doc = new jsPDF();
doc.page=1; // use this as a counter.
function footer(){
doc.text(150,285, 'page ' + doc.page); //print number bottom right
doc.page ++;
};
// and call footer() after each doc.addPage()
回答2:
I know this post is old but I'm going to offer another solution. First define your total amount of pages. There's multiple ways to determine this so I won't go into that.
var doc = new jsPDF('p', 'pt', 'letter');
doc.page = 1; // use this as a counter.
var totalPages = 10; // define total amount of pages
// HEADER
doc.setFontSize(20);//optional
doc.setTextColor(40);//optional
doc.setFontStyle('normal');//optional
doc.text("Report", 50, 22);// set your margins
// FOOTER
var str = "Page " + doc.page + " of " + totalPages;
doc.setFontSize(10);// optional
doc.text(str, 50, doc.internal.pageSize.height - 10);//key is the interal pageSize function
// Add Page content
.....
//Add new page and increase page count
doc.addPage();
doc.page ++;
//Begin process all over again.
This works well in a loop as you can set your page count by taking your array.length + 1 (as it's zero based).
回答3:
If you need something like "current page / totalPage" displaying for each page. Using "Total page number" plugin available in jspdf v1.0+
How to use:
var doc = new jsPDF();
doc.page=1; // use this as a counter.
var totalPagesExp = "{total_pages_count_string}";
function footer(){
var str = "Page " + doc.page;
if (typeof doc.putTotalPages === 'function') {
str = str + "/" + totalPagesExp;
}
doc.text(150,285, str); //print number bottom right
}
// call footer() after each doc.addPage()
// and before doc.save() do not forget put
if (typeof doc.putTotalPages === 'function') {
doc.putTotalPages(totalPagesExp);
}
It should work. Hope this helps.
回答4:
It's work for me:
I just put coordenates for A4 Paper;
Just add the for before doc.save() like this;
// Create a document
var doc = new jsPDF('p','mm','a4');
// Some stuff
doc.text("Some text", 74, 150);
doc.addPage();
doc.text("Some text", 74, 150);
doc.addPage();
doc.text("Some text", 74, 150);
doc.addPage();
doc.text("Some text", 74, 150);
doc.addPage();
doc.text("Last page", 74, 150);
// PAGE NUMBERING
// Add Page number at bottom-right
// Get the number of pages
const pageCount = doc.internal.getNumberOfPages();
// For each page, print the page number and the total pages
for(var i = 1; i <= pageCount; i++) {
// Go to page i
doc.setPage(i);
//Print Page 1 of 4 for example
doc.text('Page ' + String(i) + ' of ' + String(pageCount),210-20,297-30,null,null,"right");
}
// Save the doc
doc.save('test.pdf');
回答5:
After digging into the code, I think the feature you ask is not implemented. But there is a function to generate a footer from html and you can use this code to fullfill your need. But beware some part of the code is marked as "bad hack".
From plugins/from_html.js
checkForFooter = function (elem, renderer, elementHandlers) {
//check if we can found a <footer> element
var footer = elem.getElementsByTagName("footer");
if (footer.length > 0) {
footer = footer[0];
//bad hack to get height of footer
//creat dummy out and check new y after fake rendering
var oldOut = renderer.pdf.internal.write;
var oldY = renderer.y;
renderer.pdf.internal.write = function () {};
DrillForContent(footer, renderer, elementHandlers);
var footerHeight = Math.ceil(renderer.y - oldY) + 5;
renderer.y = oldY;
renderer.pdf.internal.write = oldOut;
//add 20% to prevent overlapping
renderer.pdf.margins_doc.bottom += footerHeight;
//Create function render header on every page
var renderFooter = function (pageInfo) {
var pageNumber = pageInfo !== undefined ? pageInfo.pageNumber : 1;
//set current y position to old margin
var oldPosition = renderer.y;
//render all child nodes of the header element
renderer.y = renderer.pdf.internal.pageSize.height - renderer.pdf.margins_doc.bottom;
renderer.pdf.margins_doc.bottom -= footerHeight;
//check if we have to add page numbers
var spans = footer.getElementsByTagName('span');
for (var i = 0; i < spans.length; ++i) {
//if we find some span element with class pageCounter, set the page
if ((" " + spans[i].className + " ").replace(/[\n\t]/g, " ").indexOf(" pageCounter ") > -1) {
spans[i].innerHTML = pageNumber;
}
//if we find some span element with class totalPages, set a variable which is replaced after rendering of all pages
if ((" " + spans[i].className + " ").replace(/[\n\t]/g, " ").indexOf(" totalPages ") > -1) {
spans[i].innerHTML = '###jsPDFVarTotalPages###';
}
}
//render footer content
DrillForContent(footer, renderer, elementHandlers);
//set bottom margin to previous height including the footer height
renderer.pdf.margins_doc.bottom += footerHeight;
//important for other plugins (e.g. table) to start rendering at correct position after header
renderer.y = oldPosition;
};
//check if footer contains totalPages which shoudl be replace at the disoposal of the document
var spans = footer.getElementsByTagName('span');
for (var i = 0; i < spans.length; ++i) {
if ((" " + spans[i].className + " ").replace(/[\n\t]/g, " ").indexOf(" totalPages ") > -1) {
renderer.pdf.internal.events.subscribe('htmlRenderingFinished', renderer.pdf.putTotalPages.bind(renderer.pdf, '###jsPDFVarTotalPages###'), true);
}
}
//register event to render footer on every new page
renderer.pdf.internal.events.subscribe('addPage', renderFooter, false);
//render footer on first page
renderFooter();
//prevent footer rendering
SkipNode['FOOTER'] = 1;
}
};
回答6:
Run this function before you run doc.save()
function addFooters() {
const pageCount = doc.internal.getNumberOfPages();
for(var i = 0; i < pageCount; i++) {
doc.text(String(i),196,285);
}
}
回答7:
Stephen Collins is the best answer! It works well with jspdf-autotable plugin.
With this is made after all is added to the doc, so we can use easy the total page number!
Add some style to the Stephen Collins answer: "page x of total"
const addFooters = doc => {
const pageCount = doc.internal.getNumberOfPages()
doc.setFont('helvetica', 'italic')
doc.setFontSize(8)
for (var i = 0; i < pageCount; i++) {
doc.text('Page ' + String(i + 1) + ' of ' + String(pageCount), doc.internal.pageSize.width / 2, 287, {
align: 'center'
})
}
}
let doc = new jsPDF()
doc.text(...)
doc.autoTable(...)
addFooters(doc)
doc.save()
来源：https://stackoverflow.com/questions/33515127/adding-footer-to-pdf-using-jspdf