javascript中的onchange不起作用

Question

This is my code:这是我的代码：

<!DOCTYPE html>
<html>
<head>

<link rel="stylesheet" type="text/css" href="style.css">
<script src="jquery-2.2.1.min.js"></script>
<script src="slike.js"></script>
<title>Uvod v jQuery</title>
</head>
<body>

<select id="izberi" onchange="yes()">
  <option value="1">Slika 1</option>
  <option value="2">Slika 2</option>
  <option value="3">Slika 3</option>
  <option value="4">Slika 4</option>
</select>

<script>
//without function
var tmp = document.getElementById("izberi");
var izbira = tmp.options[tmp.selectedIndex].value;

if(izbira == 1) {
    ...
} else if(izbira == 2) {
    ...
}

//with function
function yes(){
    var tmp = document.getElementById("izberi");
    var izbira = tmp.options[tmp.selectedIndex].value;
    if(izbira == 1) {
        ...
    } else if(izbira == 2) {
        ...
    }
}
</script>

</body>
</html>

In my IF statements I create HTML table, with rows and columns based on what is selected in select.在我的 IF 语句中，我创建了 HTML 表，行和列基于 select 中选择的内容。 Now if I don't use function ( without onchange in select ) then my code works when I enter the site ( default value of select is 1 ).现在，如果我不使用函数（在 select 中没有 onchange ），那么当我进入站点时我的代码会起作用（ select 的默认值为 1 ）。

But when I select another value for example 2 nothing happens, because my code only executes once ( when I enter the site).但是当我选择另一个值时，例如 2 什么也没有发生，因为我的代码只执行一次（当我进入网站时）。 Now I tried to fix that with onchange and calling a function ( I have the exact same code in my function ) but if I do that and I select another value my page just goes all white and it looks like my fuction is executing all the time without stop ( the same what happens when the web page is loading )现在我试图通过 onchange 并调用一个函数来解决这个问题（我的函数中有完全相同的代码）但是如果我这样做并选择另一个值，我的页面就会变成全白的，看起来我的功能一直在执行不停地（与加载网页时发生的情况相同）

So where did I make a mistake?那么我在哪里犯了错误？

EDIT编辑
I'm using document.write();我正在使用 document.write(); to create HTML table while that works when I enter the page it looks like it doesn't work after I select different value and then call the function, that is my problem I think.在我进入页面时创建 HTML 表时，它看起来像在我选择不同的值然后调用该函数后不起作用，我认为这是我的问题。

Answer 1

I'm not sure what's wrong with your code, but the following code does exactly what you're going for, and is slightly more elegant.我不确定您的代码有什么问题，但以下代码完全符合您的要求，并且稍微优雅一些。

To try it out, run the snippet or go to this Fiddle .要尝试一下，请运行代码片段或转到此 Fiddle 。

 var izberi = document.getElementById("izberi"); var izbira = document.getElementById("izbira"); var yes = function(){ var selected = izberi.options[izberi.selectedIndex].value; switch(selected) { case "1": // WHATEVER YOU WANT TO HAPPEN IF IZBERI HAS VALUE "1" izbira.value = selected; break; case "2": // WHATEVER YOU WANT TO HAPPEN IF IZBERI HAS VALUE "2" izbira.value = selected; break; case "3": // WHATEVER YOU WANT TO HAPPEN IF IZBERI HAS VALUE "3" izbira.value = selected; break; case "4": // WHATEVER YOU WANT TO HAPPEN IF IZBERI HAS VALUE "4" izbira.value = selected; break; default: // WHATEVER YOU WANT TO HAPPEN IF IZBERI HAS ANOTHER VALUE } } yes(); izberi.addEventListener('change', yes);

 <select id="izberi"> <option value="1">Slika 1</option> <option value="2">Slika 2</option> <option value="3">Slika 3</option> <option value="4">Slika 4</option> </select> <input id="izbira">

javascript中的onchange不起作用

问题描述

1 个解决方案

解决方案1
-1 已采纳 2016-03-06 14:45:27

javascript中的onchange不起作用

问题描述

1 个解决方案

解决方案1 -1 已采纳 2016-03-06 14:45:27

解决方案1
-1 已采纳 2016-03-06 14:45:27