javascript在复选框上隐藏/显示div:选中/未选中 [英] javascript Hide/show div on checkbox: checked/unchecked

问题描述

我正在尝试在 javascript 中创建一个函数，它将在我的注册表单中隐藏/显示特定的 div，具体取决于我的复选框的状态(选中或未选中).这是我的功能:

I am trying to make a function in javascript, that will hide / show particular div in my registration form, depending on the state of my checkbox (checked or not). Here is my function:

 function doruc() {
    var elem = document.getElementById('powermail_fieldwrap_331');
        if (document.getElementById  ('powermail_field_doruovaciaadresa2_1').checked) {
        elem.display='block';
        } else {elem.display:none;}
}

它不起作用.我正在检查和取消选中我的复选框，但没有任何反应.还有件事儿.我希望该 div 被初始化为隐藏.我应该把这个放在我的css中吗?:

It isnt working. I am checking and unchecking my checkbox, but nothing happens. Oh and one more thing. I want that div to be initialized as hidden. Should I put in my css this? :

 #powermail_fieldwrap_331{
 display:none;
 } 

我非常感谢任何建议.

推荐答案

你可以使用

var elem = document.getElementById('powermail_fieldwrap_331');
document.getElementById('powermail_field_doruovaciaadresa2_1').onchange = function() {
    elem.style.display = this.checked ? 'block' : 'none';
};

演示

如果你想默认隐藏它，你可以使用#powermail_fieldwrap_331{display:none;}.但如果你想确定，最好使用

If you want to hide it by default, you could use #powermail_fieldwrap_331{display:none;}. But if you want to be sure, better use

var elem = document.getElementById('powermail_fieldwrap_331'),
    checkBox = document.getElementById('powermail_field_doruovaciaadresa2_1');
checkBox.checked = false;
checkBox.onchange = function doruc() {
    elem.style.display = this.checked ? 'block' : 'none';
};
checkBox.onchange();

演示

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