从本地存储打印对象

时间:2018-05-24 19:09:40

标签: javascript html json printing printjs

我有一个费用表单,可以将数据保存到浏览器本地存储中。我在表格下方的页面上有邻居,这样在您填写表格后,您可以点击以便以良好的格式打印出数据。

由于我的应用程序的功能,我必须在本地存储中使用JSON数据。

我使用js变量从本地存储中获取数据:

var my_expenses = localStorage.getItem('my_expenses');

这是我的浏览器本地存储中的条目,具有未确定的值。

键:my_expenses 值:

{
    "income": {
        "1": {
            "name": "Pay (after tax)",
            "freq": "26",
            "value": "233"
        },
        "2": {
            "name": "Partners take home pay",
            "freq": "4",
            "value": "10"
        },
        "3": {
            "name": "Bonuses/overtime",
            "freq": "26",
            "value": "30"
        },
        "4": {
            "name": "Income from savings and investments",
            "freq": "1",
            "value": "50"
        },
        "5": {
            "name": "Child support received ",
            "freq": "12",
            "value": "40"
        }
    },
    "outgoings": {
        "1": {
            "name": "Electricity",
            "freq": "4",
            "value": "0"
        },
        "2": {
            "name": "Gas",
            "freq": "4",
            "value": "0"
        },
        "3": {
            "name": "Water",
            "freq": "4",
            "value": "0"
        },
        "4": {
            "name": "Internet",
            "freq": "4",
            "value": "0"
        },
        "5": {
            "name": "Telephone",
            "freq": "4",
            "value": "0"
        },
        "6": {
            "name": "Car Insurance",
            "freq": "1",
            "value": "0"
        }
    }
}

根据Print.js,您可以像这样打印JSON数据(包括我的本地存储数据的变量):

 <button type="button" onclick="printJS({printable: my_expenses, properties: ['name', 'freq', 'value'], type: 'json'})">
Print JSON Data

出于某种原因,我在控制台中收到错误,我无法弄明白,也没有打开对话框进行打印。

Uncaught Error: Missing printable information.
at init (print.min.js:1)
at HTMLButtonElement.onclick ((index):156)

我认为它可能是我在本地存储中的JSON结构?任何帮助都会深深感激。

尝试使用JSON.parse(),如下所示:

var my_expenses = JSON.parse(localStorage.getItem("my_expenses"));
在我添加JSON解析之前

。我收到了警告,这是控制台中本地存储的输出。

before JSON parse

我添加后,这是输出,打印按钮似乎工作:

with JSON parse

但是打印对话没有数据?

enter image description here

如何创建对象和本地存储功能:

//Set the default incomes and outgoings here
var defaultsObj = {
    'income':{
        1:{name:"Pay (after tax)",freq:52,value:0},
        2:{name:"Partners take home pay",freq:4,value:0},
        3:{name:"Bonuses/overtime",freq:26,value:0},
        4:{name:"Income from savings and investments",freq:1,value:0},
        5:{name:"Child support received ",freq:12,value:0}
    },'outgoings':{
        1:{name:"Electricity",freq:4,value:0},
        2:{name:"Gas",freq:4,value:0},
        3:{name:"Water",freq:4,value:0},
        4:{name:"Internet",freq:4,value:0},
        5:{name:"Telephone",freq:4,value:0},
        6:{name:"Car Insurance",freq:1,value:0}
    }
};  

//Functions to store and retrieve objects from localstorage
function ls_store(name,o){
    localStorage.setItem(name, JSON.stringify(o));          
};
function ls_read(name){
    return JSON.parse(localStorage.getItem(name));
};  

function set_defaults(){
    ls_store('my_expenses',defaultsObj);
    expensesObj = ls_read('my_expenses'); 
}
//If our localstroage items are empty let's store the defaults
if(ls_read('my_expenses')==null){
    set_defaults();
}

1 个答案:

答案 0 :(得分:2)

你不保存数组,printjs等待数组。

尝试保存为两个不同的数组,首先,将结果显示在pdf中。

如果显示第一个数组的数据,你必须:调用两次printjs,一个用于第一个数组,另一个用于第二个数组,或者将这两个数组合成一个数组,如果是incombe或结果,可以添加atisting到disting。