如何在字段和新创建的字段之间添加数字。 [英] How to add numbers between a field and a new created field.

问题描述

请在我的工作中有一个问题，我有输入字段，并有一个按钮，我用来创建新的输入字段与onclick事件但我的问题是如何在两个输入字段中添加数字。



我的尝试：



var count = 1;

function add（）{

count ++;

var form = document.getElementById（'3030'）

var divtest = document.createElement （div）;



divtest.innerHTML ='< form id =code_3030>< div id =credit_unitname =myfile >< input type =textid =unit4placeholder =Creditonkeyup =mul（）>< / div>< / form>';

< br $>
form.appendChild（divtest）

}







函数mul（）{



var unit = document.getElementById（'unit4'）。value，

output = document .getElementById（'code4'）;



if（form.appendChild（divest）== true）{

var ans = unit * divtest;

} else {

提醒（解决）;

}



output.value = ans;

}

please i have a problem here in my work i have and input field and have a button that i use to create new input field with onclick event but my problem is how to add numbers in both input field.

What I have tried:

var count = 1;
function add(){
count++;
var form = document.getElementById('3030')
var divtest = document.createElement("div");

divtest.innerHTML = '<form id = "code_3030"><div id = "credit_unit" name = "myfile"><input type = "text" id = "unit4" placeholder = "Credit" onkeyup = "mul()"></div></form>';

form.appendChild(divtest)
}



function mul(){

var unit = document.getElementById('unit4').value,
output = document.getElementById('code4');

if(form.appendChild(divest) == true){
var ans = unit * divtest;
}else{
alert("work it out");
}

output.value = ans;
}

推荐答案

你的Add（）函数将创建多个div和具有相同id的输入

Your Add() function will create multiple div and inputs with same id

<div id = "credit_unit" name = "myfile">
<input type = "text" id = "unit4" placeholder = "Credit" onkeyup ="mul()">
</div>

<div id = "credit_unit" name = "myfile">
<input type = "text" id = "unit4" placeholder = "Credit" onkeyup ="mul()">
</div>

getElementById将返回更多值节点，您需要循环或采用默认值或创建一个唯一身份。同时删除代码中类型之间的空格，并在javascript中使用双引号而不是单引号。

getElementById will return more value nodes, you need to loop or take the default or create a unique id. Also remove te spaces between the types in your code and use double quotes in your javascript instead of single.

document.getElementById("code4")[0].value;

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