莱州网站开发,上海网站优化,网络公司推广方案,网站开发用php还是.net好web pdf 拖拽签章
主要通过火狐的pdfjs 来实现
1. 下载js 并编译 地址 https://mozilla.github.io/pdf.js/ 按照官网当下下载并编译就得到了js 2.其实也没有什么好讲的#xff0c;都是用的js中的方法#xff0c;官网中都有 按照步骤就能生成一个document元素#xff0c;然…web pdf 拖拽签章
主要通过火狐的pdfjs 来实现
1. 下载js 并编译 地址 https://mozilla.github.io/pdf.js/ 按照官网当下下载并编译就得到了js 2.其实也没有什么好讲的都是用的js中的方法官网中都有 按照步骤就能生成一个document元素然后通过js方法操作元素就好了。 注意web页面显示的元素的大小和元素的大小不一样要注意比例
3.效果展示
原图 签字后 下载后
4.代码展示
divdiv classcontainerdiv classleft idcanvas/divdiv classrightulliimg classsign-img th:src{/sign/img.jpg} onmousedownsrcImgMoveDown(this); //li/ulbutton typebutton onclicksaveAndDown();保存并下载/button/div/divinput typehidden value idhiddenInput
/divscriptvar moveFlag falsevar downFlag falsevar bodyvar scale 1.5;window.onload function () {document.body.ondrop function(event) {event.preventDefault();event.stopPropagation();}getPdf()body document.getElementsByTagName(body)[0]body.addEventListener(mousemove,function(eve){if(!moveFlag){return}var img document.getElementById(moveImg)img.style.position fixedimg.style.top eve.clientY pximg.style.left eve.clientX px})document.getElementById(canvas).addEventListener(click,function (){moveFlag !moveFlag})}function getPdf() {var loadingTask pdfjsLib.getDocument(/index/getPdf)loadingTask.promise.then(function (pdf) {for (let i 1; i pdf.numPages; i) {pdf.getPage(i).then(function (page) {var viewport page.getViewport({scale: scale,});var outputScale window.devicePixelRatio || 1;var canvas document.createElement(canvas)canvas.setAttribute(name,canvas)canvas.setAttribute(id,canvasi)canvas.addEventListener(mouseup,eleClick)var context canvas.getContext(2d);canvas.width Math.floor(viewport.width * outputScale);canvas.height Math.floor(viewport.height * outputScale);canvas.style.width Math.floor(viewport.width) px;canvas.style.height Math.floor(viewport.height) px;var transform outputScale ! 1? [outputScale, 0, 0, outputScale, 0, 0]: null;var renderContext {canvasContext: context,transform: transform,viewport: viewport,background:beige};page.render(renderContext);document.getElementById(canvas).appendChild(canvas)});}})}function eleClick(even){let clientX even.pageX - this.offsetLeft;let clientY even.pageY - this.offsetTop;let id this.getAttribute(id)console.log(id,clientX,clientY)document.getElementById(hiddenInput).value clientX , clientY , id , scale}function srcImgMoveDown(obj){var _img document.getElementById(moveImg)console.log(_img)if(_img){return}var img document.createElement(img)img.setAttribute(class,obj.getAttribute(class))img.setAttribute(src,obj.getAttribute(src))img.setAttribute(id,moveImg)body.appendChild(img)moveFlag true}function saveAndDown(){var val document.getElementById(hiddenInput).valuewindow.open(/index/saveAndDown?val val)}5.问题和完整代码请在评论区留言
