View pdf instead of download using PDF js

问题

In my page, I'm trying to display a thumbnails of my pdf using PDF JS and it works on local, but when I upload my code in my webserver the pdf file is auto download.

In my local :

Code :

$(function() {  

        var filePath = "http://example.com/public/uploads/docs/Document_One_1.pdf";

        function Num(num) {
            var num = num;

            return function () {
                return num;
            }
        };

        function renderPDF(url, canvasContainer, options) {
            var options = options || {
                    scale: 1.1
                },          
                func,
                pdfDoc,
                def = $.Deferred(),
                promise = $.Deferred().resolve().promise(),         
                width, 
                height,
                makeRunner = function(func, args) {
                    return function() {
                        return func.call(null, args);
                    };
                };

            function renderPage(num) {          
                var def = $.Deferred(),
                    currPageNum = new Num(num);
                pdfDoc.getPage(currPageNum()).then(function(page) {
                    var viewport = page.getViewport(options.scale);
                    var canvas = document.createElement("canvas");
                    canvas.setAttribute("id","pdfCanvas"+num);
                    canvas.setAttribute("onclick","popCanvas('{{url('/dashboard/showcanvas')}}','"+document.getElementById('pdfPath').innerHTML+"','"+num+"');");
                    var ctx = canvas.getContext('2d');
                    var renderContext = {
                        canvasContext: ctx,
                        viewport: viewport
                    };

                    if(currPageNum() === 1) {                   
                        height = viewport.height;
                        width = viewport.width;
                    }

                    canvas.height = height;
                    canvas.width = width;

                    canvasContainer.appendChild(canvas);

                    page.render(renderContext).then(function() {                                        
                        def.resolve();
                    });
                })

                return def.promise();
            }

            function renderPages(data) {
                pdfDoc = data;

                var pagesCount = pdfDoc.numPages;
                for (var i = 1; i <= pagesCount; i++) { 
                    func = renderPage;
                    promise = promise.then(makeRunner(func, i));
                }
            }

            PDFJS.disableWorker = true;
            PDFJS.getDocument(url).then(renderPages);       
        };

        var body = document.getElementById("bodyofpdf");
        renderPDF(filePath, body);
    });

When I change the filepath url, for example: "https://www.tutorialspoint.com/bootstrap/bootstrap_tutorial.pdf", it works.

Can somebody help me ??

Sorry for my poor english.

回答1:

If you are using Laravel you can control the behaviour of the routes, including the one to a .pdf. For local files, browsers have a different behaviour by default than for no local files.

I have used a lot PDF.js and I don't know why do you link the user directly to the file, you could create like a view page where it gets a parameter like the id or the name of the book and then you load it with pdf.js. If you use an url with a file extension you will probably confuse the browser.

yourpage.com/books/view/{id_book}

来源：https://stackoverflow.com/questions/36392947/view-pdf-instead-of-download-using-pdf-js