我陷入了逻辑问题。
我有一个数组,我在其中使用array.push()
堆叠项目,这些项目来自用户的输入。
现在的问题是:
如何将这些项目打印到DOM?我正在使用ATM,
function getInput(operator, description, value) {
// SAVE IN INCOME IF "+" IS CHOOSEN (DEFAULT)
if (addType.value == 'inc') {
let op = incomeArr['operator'] = operator;
let des = incomeArr['description'] = description;
let val = incomeArr['value'] = value;
incomeArr.push([op, des, val]);
return incomeArr;
}
}
在getInput();
中创建关联数组
第一次尝试将此数据打印到DOM中,如下所示:
function printToDOM(item) {
// every function call should run this once to update the UI
const incomeList = document.querySelector('.income__list');
const expenseList = document.querySelector('.expenses__list');
let incomeItemSpan = `<span> ${item.description}: ${item.value} </span></br>`;
let expenseItemSpan = `<span> ${item.description}: ${item.value} </span> </br>`;
for (var i = 0; i < expenseArr.length; i++) {
incomeItemSpan;
incomeList.append(incomeItemSpan);
}
}
我的问题是我的forLoop索引条件由于“每次函数调用”而混乱,在下一个函数调用中,打印出的值将被打印两次。索引再次从0开始,即使使用功能外循环计数器也无法正常工作。
[![gave-input] [1]] [1]
所以下一次尝试是:
function printToDOM(item) {
// every function call should run this once to update the UI
const incomeList = document.querySelector('.income__list');
const expenseList = document.querySelector('.expenses__list');
let incomeItemSpan = `<span> ${item.description}: ${item.value} </span></br>`;
let expenseItemSpan = `<span> ${item.description}: ${item.value} </span> </br>`;
incomeArr.forEach(() => {
incomeList.innerHTML = incomeItemSpan;
});
}
我用forEach尝试过,这里的问题是,我完全不知道如何在没有innerHTML的情况下打印出incomeItemSpan
。我想要从上到下堆叠的DOM中的项目列表,每一行都是数组中的新项目,就像我将使用item.append()
一样,但是HTML无法在append()中工作。
我该怎么做?
/* TODO:
- Add Eventlistener for Submit a +/- Value
- if + {add 1. into INCOME section} + Set INCOME in header to the amount
of all incomes added
if - {same like if+ just for -}
- create a update DOM function to update the visualisation of the calculations
- INCOME AND EXPENSES should be a Array
- add a prototype function to remove entrys from INCOME and EXPENSES, use
indexOf to get the index item and remove with array.splice().
- calc every expense with INCOME to get a % value of how much this entry is
% related to the max INCOME
*/
// VARS:
let addType = document.querySelector('.add__type');
let description = document.querySelector('.add__description');
let addValue = document.querySelector('.add__value');
let incomeArr = [];
let expenseArr = [];
// EVENTLISTENER Constructor:
function EventListner(selector, listner, fnt) {
this.selector = selector;
this.listner = listner;
this.fnt = fnt;
document.querySelector(selector).addEventListener(listner, fnt);
};
// getInput VALUES FROM USER Constructor:
function getInput(operator, description, value) {
// SAVE IN INCOME IF "+" IS CHOOSEN (DEFAULT)
if (addType.value == 'inc') {
let op = incomeArr['operator'] = operator;
let des = incomeArr['description'] = description;
let val = incomeArr['value'] = value;
incomeArr.push([op, des, val]);
// TODO: WHAT AFTER SAVING?
return incomeArr;
}
// SAVE IN EXPENSE IF "-" IS CHOOSEN
if (addType.value == 'exp') {
let op = expenseArr['operator'] = operator;
let des = expenseArr['description'] = description;
let val = expenseArr['value'] = value;
expenseArr.push([op, des, val]);
// TODO: WHAT AFTER SAVING?
return expenseArr;
}
};
// STUCK AS FUCK!
function printToDOM(item) {
// every function call should run this once to update the UI
const incomeList = document.querySelector('.income__list');
const expenseList = document.querySelector('.expenses__list');
let incomeItemSpan = `<span> ${item.description}: ${item.value} </span></br>`;
let expenseItemSpan = `<span> ${item.description}: ${item.value} </span> </br>`;
incomeArr.forEach(() => {
incomeList.innerHTML = incomeItemSpan;
});
// for (var i = 0; i < incomeArr.length; i++) {
// console.log([i]);
// incomeItemSpan;
// incomeList.append(incomeItemSpan);
// }
// console.log(incomeItemSpan);
//
// incomeList.append(expenseArr);
// incomeArr.toString();
// expenseArr.toString();
// incomeList.innerHTML = incomeItemSpan;
};
const main = (function() {
// EVENTLISTENERS
const clickListener = new EventListner('.add__btn', 'click', () => {
if (description.value == '' || addValue.value == '') {
// MAKE SURE DESCRIPTION AND VALUE IS NOT EMPTY
alert('description and value can\'t be empty');
return;
}
getInput(addType.value, description.value, addValue.value);
});
const enterKeyListener = new EventListner('.add__value', 'keypress', (e) => {
let testArray = [];
for (var i = 0; i < testArray.length; i++) {
testArray[i] = [i];
console.log(testArray[i]);
}
testArray.push('item');
if (e.keyCode == 13) {
if (description.value == '' || addValue.value == '') {
// MAKE SURE DESCRIPTION AND VALUE IS NOT EMPTY
alert('description and value can\'t be empty');
return;
}
// ON ENTER SAVE VALUES IN AN ARRAY
// IF PLUS INTO incomeArr, ON MINUS INTO expenseArr
// getInput(addType.value, description.value, addValue.value);
printToDOM(getInput(addType.value, description.value, addValue.value));
}
});
}());
//
/**********************************************
*** GENERAL
**********************************************/
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
.clearfix::after {
content: "";
display: table;
clear: both;
}
body {
color: #555;
font-family: Open Sans;
font-size: 16px;
position: relative;
height: 100vh;
font-weight: 400;
}
.right { float: right; }
.red { color: #FF5049 !important; }
.red-focus:focus { border: 1px solid #FF5049 !important; }
/**********************************************
*** TOP PART
**********************************************/
.top {
height: 40vh;
background-image: linear-gradient(rgba(0, 0, 0, 0.35), rgba(0, 0, 0, 0.35)), url(back.png);
background-size: cover;
background-position: center;
position: relative;
}
.budget {
position: absolute;
width: 350px;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
color: #fff;
}
.budget__title {
font-size: 18px;
text-align: center;
margin-bottom: 10px;
font-weight: 300;
}
.budget__value {
font-weight: 300;
font-size: 46px;
text-align: center;
margin-bottom: 25px;
letter-spacing: 2px;
}
.budget__income,
.budget__expenses {
padding: 12px;
text-transform: uppercase;
}
.budget__income {
margin-bottom: 10px;
background-color: #28B9B5;
}
.budget__expenses {
background-color: #FF5049;
}
.budget__income--text,
.budget__expenses--text {
float: left;
font-size: 13px;
color: #444;
margin-top: 2px;
}
.budget__income--value,
.budget__expenses--value {
letter-spacing: 1px;
float: left;
}
.budget__income--percentage,
.budget__expenses--percentage {
float: left;
width: 34px;
font-size: 11px;
padding: 3px 0;
margin-left: 10px;
}
.budget__expenses--percentage {
background-color: rgba(255, 255, 255, 0.2);
text-align: center;
border-radius: 3px;
}
/**********************************************
*** BOTTOM PART
**********************************************/
/***** FORM *****/
.add {
padding: 14px;
border-bottom: 1px solid #e7e7e7;
background-color: #f7f7f7;
}
.add__container {
margin: 0 auto;
text-align: center;
}
.add__type {
width: 55px;
border: 1px solid #e7e7e7;
height: 44px;
font-size: 18px;
color: inherit;
background-color: #fff;
margin-right: 10px;
font-weight: 300;
transition: border 0.3s;
}
.add__description,
.add__value {
border: 1px solid #e7e7e7;
background-color: #fff;
color: inherit;
font-family: inherit;
font-size: 14px;
padding: 12px 15px;
margin-right: 10px;
border-radius: 5px;
transition: border 0.3s;
}
.add__description { width: 400px;}
.add__value { width: 100px;}
.add__btn {
font-size: 35px;
background: none;
border: none;
color: #28B9B5;
cursor: pointer;
display: inline-block;
vertical-align: middle;
line-height: 1.1;
margin-left: 10px;
}
.add__btn:active { transform: translateY(2px); }
.add__type:focus,
.add__description:focus,
.add__value:focus {
outline: none;
border: 1px solid #28B9B5;
}
.add__btn:focus { outline: none; }
/***** LISTS *****/
.container {
width: 1000px;
margin: 60px auto;
}
.income {
float: left;
width: 475px;
margin-right: 50px;
}
.expenses {
float: left;
width: 475px;
}
h2 {
text-transform: uppercase;
font-size: 18px;
font-weight: 400;
margin-bottom: 15px;
}
.icome__title { color: #28B9B5; }
.expenses__title { color: #FF5049; }
.item {
padding: 13px;
border-bottom: 1px solid #e7e7e7;
}
.item:first-child { border-top: 1px solid #e7e7e7; }
.item:nth-child(even) { background-color: #f7f7f7; }
.item__description {
float: left;
}
.item__value {
float: left;
transition: transform 0.3s;
}
.item__percentage {
float: left;
margin-left: 20px;
transition: transform 0.3s;
font-size: 11px;
background-color: #FFDAD9;
padding: 3px;
border-radius: 3px;
width: 32px;
text-align: center;
}
.income .item__value,
.income .item__delete--btn {
color: #28B9B5;
}
.expenses .item__value,
.expenses .item__percentage,
.expenses .item__delete--btn {
color: #FF5049;
}
.item__delete {
float: left;
}
.item__delete--btn {
font-size: 22px;
background: none;
border: none;
cursor: pointer;
display: inline-block;
vertical-align: middle;
line-height: 1;
display: none;
}
.item__delete--btn:focus { outline: none; }
.item__delete--btn:active { transform: translateY(2px); }
.item:hover .item__delete--btn { display: block; }
.item:hover .item__value { transform: translateX(-20px); }
.item:hover .item__percentage { transform: translateX(-20px); }
.unpaid {
background-color: #FFDAD9 !important;
cursor: pointer;
color: #FF5049;
}
.unpaid .item__percentage { box-shadow: 0 2px 6px 0 rgba(0, 0, 0, 0.1); }
.unpaid:hover .item__description { font-weight: 900; }
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<link href="https://fonts.googleapis.com/css?family=Open+Sans:100,300,400,600" rel="stylesheet" type="text/css">
<link href="http://code.ionicframework.com/ionicons/2.0.1/css/ionicons.min.css" rel="stylesheet" type="text/css">
<link type="text/css" rel="stylesheet" href="style.css">
<title>Budgety</title>
</head>
<body>
<div class="top">
<div class="budget">
<div class="budget__title">
Available Budget in <span class="budget__title--month">%Month%</span>:
</div>
<div class="budget__value">+ 0</div>
<div class="budget__income clearfix">
<div class="budget__income--text">Income</div>
<div class="right">
<div class="budget__income--value">+ 0</div>
<div class="budget__income--percentage"> </div>
</div>
</div>
<div class="budget__expenses clearfix">
<div class="budget__expenses--text">Expenses</div>
<div class="right clearfix">
<div class="budget__expenses--value">- 0</div>
<div class="budget__expenses--percentage">0%</div>
</div>
</div>
</div>
</div>
<div class="bottom">
<div class="add">
<div class="add__container">
<select class="add__type">
<option value="inc" selected>+</option>
<option value="exp">-</option>
</select>
<input type="text" class="add__description" placeholder="Add description">
<input type="number" class="add__value" placeholder="Value">
<button class="add__btn"><i class="ion-ios-checkmark-outline"></i></button>
</div>
</div>
<div class="container clearfix">
<div class="income">
<h2 class="icome__title">Income</h2>
<div class="income__list">
<!-- <div class="item clearfix" id="income-0">
<div class="item__description"></div>
<div class="right clearfix">
<div class="item__value"></div>
<div class="item__delete">
<button class="item__delete--btn"><i class="ion-ios-close-outline"></i></button>
</div>
</div>
</div>
<div class="item clearfix" id="income-1">
<div class="item__description">Sold car</div>
<div class="right clearfix">
<div class="item__value">+ 1,500.00</div>
<div class="item__delete">
<button class="item__delete--btn"><i class="ion-ios-close-outline"></i></button>
</div>
</div>
</div> -->
</div>
</div>
<div class="expenses">
<h2 class="expenses__title">Expenses</h2>
<div class="expenses__list">
<!--
<div class="item clearfix" id="expense-0">
<div class="item__description">Apartment rent</div>
<div class="right clearfix">
<div class="item__value">- 900.00</div>
<div class="item__percentage">21%</div>
<div class="item__delete">
<button class="item__delete--btn"><i class="ion-ios-close-outline"></i></button>
</div>
</div>
</div>
<div class="item clearfix" id="expense-1">
<div class="item__description">Grocery shopping</div>
<div class="right clearfix">
<div class="item__value">- 435.28</div>
<div class="item__percentage">10%</div>
<div class="item__delete">
<button class="item__delete--btn"><i class="ion-ios-close-outline"></i></button>
</div>
</div>
</div>
-->
</div>
</div>
</div>
</div>
<script src="app.js"></script>
</body>
</html>
答案 0 :(得分:0)
这正是您想要的吗?
const arr = new Array();
function addList() {
const el = document.querySelector("input[name=user]")
const val = el.value
arr.push(val);
el.value = null;
return false;
}
function showList() {
for (let i = 0; i < arr.length; i++) {
const listElement = document.createElement("li");
listElement.textContent = arr[i]
document.body.appendChild(listElement);
}
}
<form onsubmit="return addList()">
<input type="text" name="user">
<button>Add list item</button>
</form><br>
<button class="showList" onclick="showList()">Show list</button>
<ul class="list"></ul>
答案 1 :(得分:0)
要创建项目列表,请创建一个有序/无序列表,然后将每个项目追加到forEach中的此列表中,最后将html设置为有序//无序列表。 示例:
var ol=$('<ol></ol>');
incomeArr.forEach(() => {
ol.append($('<li></li>').text(`${item.description}: ${item.value}`));
});
$('#display').html(ol);