我不是一个庞大的javascript/jquery用户,但我已经开始在移动应用程序中使用它了。。。我一直在寻找一个答案来解决我在尝试使用jspdf将html输出为pdf时遇到的空白页面问题,我发现的每一篇帖子都与blobs有关。
这是我的代码,它导出了一个空白的pdf。我把pdf保存在里面,所以我在我的电脑上得到了一个导出,作为它应该是什么样子的示例,但在我的ipad和nexus 7上,它保存了一个空的pdf。
var pdf = new jsPDF('p', 'pt', 'letter'), source = $('#home')[0], specialElementHandlers = {
'#bypassme': function(element, renderer){
return true
}
}
margins = {top: 80,bottom: 60,left: 40,width: 522};
pdf.fromHTML(source, margins.left, margins.top, {
'width': margins.width // max width of content on PDF
, 'elementHandlers': specialElementHandlers
},
function (dispose) {
pdf.save('home.pdf');
console.log( pdfOutput );
var pdfOutput = doc.output();
console.log("file system - ");
window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function(fileSystem) {
console.log(fileSystem.name);
console.log(fileSystem.root.name);
console.log(fileSystem.root.fullPath);
fileSystem.root.getFile("test.pdf", {create: true}, function(entry) {
var fileEntry = entry;
console.log(entry);
entry.createWriter(function(writer) {
writer.onwrite = function(evt) {
alert("write success");
};
console.log("writing to file");
writer.write( pdfOutput );
}, function(error) {
console.log(error);
});
}, function(error){
console.log(error);
});
},
function(event){
console.log( evt.target.error.code );
});
},
margins
)
有人能给我一个提示,或者为我指明正确的方向,告诉我如何将您的解决方案纳入我的编码中,这样我就可以保存html格式&图像?
我刚刚遇到了同样的问题。以下是我解决问题的方法。
更换线路
writer.write( pdfOutput );
使用此:
var data = pdfOutput;
var buffer = new ArrayBuffer(data.length);
var array = new Uint8Array(buffer);
for (var i = 0; i < data.length; i++) {
array[i] = data.charCodeAt(i);
}
writer.write(buffer);
不能100%确定我是否理解发生了什么,但根据我一直在研究的情况,在写入文件之前,您需要将jsPDF的输出转换为ArrayBuffer。
@AdilWaqar我为我的回复延迟道歉,我一直在搬家。下面我包含了我完成的pdf打印工作的完整javascript。它在android&IOS,但IOS的问题是,一旦生成pdf,您就无法通过文件管理器访问它。
localStorage在输出之前用于存储,它在特定部分的输出html中的span字段上有相同的id名称,例如javascript中的第3部分有一些签名和一些文本框要输出,输出中一个文本字段的localStorage是…
getItem('cwiRiskAccesAsessName')
html输出是…
<tr><td>Assessor Name:</td><td><span id="EXPcwiRiskAccesAsessName"></span></td></tr>
我使用jquery通过构建准备输出的html并为每个项的id添加前缀来预填充span字段,完成后,我使用这一行来处理keyup上的自动填充。注意:忽略onkeyup中的"inpt",这是数据处理函数的另一部分中的前缀
onKeyUp="dataHandling(this,1,'inpt');"
var saveData = localStorage.setItem(source.id,source.value);var getData = localStorage.getItem(source.id);$("#EXP"+source.id).text(getData);
以下是完整的pdf输出javascript
/* STORAGE-OUTPUT */
function storageOutput(){for (var i = 0; i < localStorage.length; i++){
/* do something with localStorage.getItem(localStorage.key(i));*/
$("#storageHolder").append(localStorage.key(i)+'<br/>');}
}
/* SETUP */
function setup(){
window.requestFileSystem(LocalFileSystem.PERSISTENT,0,onRequestFileSystemSuccess,null);
function onRequestFileSystemSuccess(fileSystem){
var entry=fileSystem.root;entry.getDirectory("MAIN-DIRECTORY",{create:true,exclusive:false},onGetDirectorySuccess,onGetDirectoryFail);
}
function onGetDirectorySuccess(dir){}
function onGetDirectoryFail(error){
alert('Directory Setup Fail');}
}/*CLEAR LOCALSTORAGE*/function clearLS(){
localStorage.clear();alert(localStorage.length);
}
function savePDF(id,filename) {
var folderName = 'MAIN-DIRECTORY/'+localStorage.getItem('householderAddress')+', '+localStorage.getItem('householderPostcode');
var saveData = localStorage.setItem('saveLocation',folderName);
var getData = localStorage.getItem('saveLocation');
window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, onRequestFileSystemSuccess, null);
function onRequestFileSystemSuccess(fileSystem) {
var entry=fileSystem.root;
entry.getDirectory(getData, {create: true, exclusive: false}, onGetDirectorySuccess, onGetDirectoryFail);
}
function onGetDirectorySuccess(dir){}
function onGetDirectoryFail(error){}
if(id==1){
var pdf = new jsPDF('p', 'pt', 'a4'),source = $('#savesec1')[0]
, specialElementHandlers = {
'#bypassme': function(element, renderer){
return true
}
}
} else if (id==2){
var pdf = new jsPDF('p', 'pt', 'a4'),source = $('#savesec2')[0]
, specialElementHandlers = {
'#bypassme': function(element, renderer){
return true
}
}
} else if (id==3){
var pdf = new jsPDF('p', 'pt', 'a4'),source = $('#savesec3')[0]
, specialElementHandlers = {
'#bypassme': function(element, renderer){
return true
}
}
}
margins = {top: 40,bottom: 60,left: 40,width: 522};
pdf.fromHTML(source, margins.left, margins.top, {
'width': margins.width // max width of content on PDF
, 'elementHandlers': specialElementHandlers
},
function(dispose){
/*SECTION 2*/
if(id==2){
pdf.addImage(localStorage.getItem('householderSig1'),'PNG',135,270,150,50);pdf.addImage(localStorage.getItem('assessSig1'),'PNG',135,410,150,50);
}
/*SECTION 3*/
else if(id==3){
pdf.addPage();pdf.setFontSize(15);pdf.setFontType("normal");pdf.text(20,30,'Assessor Name: '+localStorage.getItem('cwiRiskAccesAsessName'));pdf.text(20,45,'Assessor Agency: '+localStorage.getItem('cwiRiskAccesAsessAgency'));pdf.text(20,60, 'Date: '+localStorage.getItem('assessSig3Date'));pdf.text(20,75, 'Assessor Signature: ');pdf.addImage(localStorage.getItem('assessSig3'),'PNG',20,85,250,100);pdf.addPage();pdf.setFontSize(25);pdf.setFontType("normal");pdf.text(20,40,'Plan View:');pdf.addImage(localStorage.getItem('drawingOutput'),'PNG',20,40,500,500);pdf.addPage();pdf.setFontSize(15);pdf.setFontType("normal");pdf.text(20,30,'Front Elevation: '+localStorage.getItem('cwiRiskFrontNotes'));pdf.text(20,430,'Rear Elevation: '+localStorage.getItem('cwiRiskRearNotes'));pdf.addImage(localStorage.getItem('cwiRiskFrontOutput'),'PNG',40,40,500,350);pdf.addImage(localStorage.getItem('cwiRiskRearOutput'),'PNG', 40, 440, 500, 350);pdf.addPage();pdf.setFontSize(15);pdf.setFontType("normal");pdf.text(20,30,'Left Side Elevation: '+localStorage.getItem('cwiRiskLeftNotes'));pdf.text(20,430,'Right Side Elevation: '+localStorage.getItem('cwiRiskRightNotes'));pdf.addImage(localStorage.getItem('cwiRiskLeftOutput'),'PNG',40,40,500,350);pdf.addImage(localStorage.getItem('cwiRiskRightOutput'),'PNG',40,440,500,350);
}
/* GENERIC IMAGE OUTPUT
pdf.addImage(imgData, 'PNG', 40, 400, 400, 160);
pdf.addImage(imgData, 'PNG', 40, 600, 400, 160);
for (var i=0;i<dataSources.length;i++){
pdf.addPage();
alert(dataSources[i].text);
}
pdf.save(filename+'.pdf');*/
var pdfOutput = pdf.output();
//console.log( pdfOutput );
window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function(fileSystem) {
fileSystem.root.getFile(getData+'/'+filename+'.pdf', {create: true}, function(entry) {
var fileEntry = entry;
//console.log(entry);
entry.createWriter(function(writer) {
writer.onwrite = function(evt) {
alert("PDF Saved Successfully");
};
console.log("writing to file");
var data = pdfOutput;
var buffer = new ArrayBuffer(data.length);
var array = new Uint8Array(buffer);
for (var i = 0; i < data.length; i++) {
array[i] = data.charCodeAt(i);
}
writer.write(buffer);
}, function(error) {
alert(error);
});
}, function(error){
console.log(error);
});
},
function(event){
console.log( evt.target.error.code );
});
},
margins
)
}