2023年2月19日 04:46:21go评论73阅读模式

英文:

Why does on Hover quit working after it is selected once?

问题

以下是您的代码的翻译部分，包括HTML和JavaScript的内容：

<!DOCTYPE html>
<html>
  <head>
    <style>
      .menu {
        background-color: cornflowerblue;
      }

      .btn-group .button {
        background-color: #4CAF50; /* 绿色 */
        border: 1px solid green;
        color: white;
        padding: 15px 32px;
        text-align: center;
        text-decoration: none;
        font-size: 16px;
        cursor: pointer;
        width: 150px;
        display: block;
      }

      .btn-group .button:hover {
        background-image: linear-gradient(to bottom, rgb(92, 88, 46), rgb(247, 229, 41), rgb(92, 88, 46));
        color: red;
      }
    </style>
  </head>
  <body onload="fnOnLoad()">
    <div class="menu">
      <div class="btn-group">
        <button id="WhatsNew" onclick="btnClick('WhatsNew')" class="button">What's New</button>
        <button id="Button1" onclick="btnClick('Button1')" class="button">Button1</button>
        <button id="Button2" onclick="btnClick('Button2')" class="button">Button2</button>
        <button id="Button3" onclick="btnClick('Button3')" class="button">Button3</button>
        <button id="Button4" onclick="btnClick('Button4')" class="button">Button4</button>
      </div>
    </div>
  </body>
  <script>
    let curBtn = "WhatsNew";

    function fnOnLoad() {
      btnClick("WhatsNew");
    }

    function btnClick(btnName) {
      document.getElementById(curBtn).style.backgroundColor = "rgb(33, 31, 31)";
      document.getElementById(curBtn).style.backgroundImage = "none";
      document.getElementById(curBtn).style.color = "rgb(255, 234, 0)";

      document.getElementById(btnName).style.color = "rgb(17, 15, 15)";
      document.getElementById(btnName).style.backgroundImage = "linear-gradient(to bottom, rgb(92, 88, 46), rgb(247, 229, 41), rgb(92, 88, 46))";
      curBtn = btnName;
    }
  </script>
</html>

请注意，这只是代码的翻译，不包括您提到的问题的解决方案。如果您需要关于问题的解决方案，请提供更多详细信息，以便我可以帮助您。

英文:

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
&lt;style&gt;
.menu{
background-color: cornflowerblue;
}
.btn-group .button {
background-color: #4CAF50; /* Green */
border: 1px solid green;
color: white;
padding: 15px 32px;
text-align: center;
text-decoration: none;
font-size: 16px;
cursor: pointer;
width: 150px;
display: block;
}
.btn-group .button:hover {
background-image: linear-gradient(to bottom,  rgb(92, 88, 46),  
rgb(247, 229, 41),              
rgb(92,88,46));
color:red;
}
&lt;/style&gt;
&lt;/head&gt;
&lt;body onload=&quot;fnOnLoad()&quot;&gt;
&lt;div class=&quot;menu&quot;&gt; 
&lt;div class=&quot;btn-group&quot;&gt;
&lt;button id = &quot;WhatsNew&quot; onclick=&quot;btnClick(&#39;WhatsNew&#39;)&quot; class=&quot;button&quot;&gt;What&#39;s New&lt;/button&gt;
&lt;button id = &quot;Button1&quot; onclick=&quot;btnClick(&#39;Button1&#39;)&quot; class=&quot;button&quot;&gt;Button1&lt;/button&gt;
&lt;button id = &quot;Button2&quot; onclick=&quot;btnClick(&#39;Button2&#39;)&quot; class=&quot;button&quot;&gt;Button2&lt;/button&gt;
&lt;button id = &quot;Button3&quot; onclick=&quot;btnClick(&#39;Button3&#39;)&quot; class=&quot;button&quot;&gt;Button3&lt;/button&gt;
&lt;button id = &quot;Button4&quot; onclick=&quot;btnClick(&#39;Button4&#39;)&quot; class=&quot;button&quot;&gt;Button4&lt;/button&gt;
&lt;/div&gt;
&lt;/div&gt;
&lt;/body&gt;
&lt;script&gt;
let curBtn = &quot;WhatsNew&quot;;
function fnOnLoad(){
/*alert(&quot;In OnLoad&quot;); */
btnClick(&quot;WhatsNew&quot;);
}
function btnClick(btnName){
/*alert(&quot;Setting button colors.  curBtn = &quot; + curBtn + &quot; btnName = &quot; + btnName);*/
document.getElementById(curBtn).style.backgroundColor = &quot;rgb(33, 31, 31)&quot;;
document.getElementById(curBtn).style.backgroundImage = &quot;none&quot;;
document.getElementById(curBtn).style.color = &quot;rgb(255, 234, 0)&quot;;
document.getElementById(btnName).style.color = &quot;rgb(17, 15, 15)&quot;;
document.getElementById(btnName).style.backgroundImage = &quot;linear-gradient(to bottom,  rgb(92, 88, 46),  rgb(247, 229, 41),  rgb(92,88,46))&quot;;
curBtn = btnName;
/*alert(&quot;after curBtn = &quot; + curBtn);*/
}
&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;

I want the menu items to change to the gradient when hovered or when selected. The way it's working now it works until you select that menu item. Once you click another menu item the ones previously selected do not do the gradient anymore.

This site won't let me post without more details.... If you try the above code the first item is highlighted when it starts. As you hover over the other items you see them highlighted. After you select a new item the old one no longer highlights when you hover over it. Why?

Thanks for any ideas.

Alan

答案1

得分: 0

当你使用JS设置样式规则时，会覆盖之前用CSS写的规则，因此在取消设置后将不再起作用。

我建议你仅使用JS来设置元素的类名，让CSS负责设置规则。

要注意以正确的顺序编写规则。

<!-- 开始代码片段: js 隐藏: false 控制台: true babel: false -->

<!-- 语言: lang-js -->
let curBtn = "WhatsNew";

function btnClick(btnName) {
  document.getElementById(curBtn).classList.add("visited");
  document.getElementById(curBtn).classList.remove("selected");
  document.getElementById(btnName).classList.add("selected");
  curBtn = btnName;
}

<!-- 语言: lang-css -->
.menu {
  background-color: cornflowerblue;
}

.btn-group .button {
  background-color: #4CAF50;
  /* 绿色 */
  border: 1px solid green;
  color: white;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  font-size: 16px;
  cursor: pointer;
  width: 150px;
  display: block;
}

.btn-group .button.visited {
  background-color: rgb(33, 31, 31);
  background-image: none;
  color: rgb(255, 234, 0);
}

.btn-group .button.selected {
  color: rgb(17, 15, 15);
  background-image: linear-gradient(to bottom, rgb(92, 88, 46), rgb(247, 229, 41), rgb(92, 88, 46));
}

.btn-group .button:hover {
  background-image: linear-gradient(to bottom, rgb(92, 88, 46), rgb(247, 229, 41), rgb(92, 88, 46));
  color: red;
}

<!-- 语言: lang-html -->
<div class="menu">
  <div class="btn-group">
    <button id="WhatsNew" onclick="btnClick('WhatsNew')" class="button">What's New</button>
    <button id="Button1" onclick="btnClick('Button1')" class="button">Button1</button>
    <button id="Button2" onclick="btnClick('Button2')" class="button">Button2</button>
    <button id="Button3" onclick="btnClick('Button3')" class="button">Button3</button>
    <button id="Button4" onclick="btnClick('Button4')" class="button">Button4</button>
  </div>
</div>

<!-- 结束代码片段 -->

英文:

When you set a style rule with JS you erase the one you wrote with css so it wont work anymore after being unset.

I suggest you use JS only to set class names to your element and let CSS in charge of setting the rules.

Careful to write the rules in the right order.

let curBtn = &quot;WhatsNew&quot;;
function btnClick(btnName) {
document.getElementById(curBtn).classList.add(&quot;visited&quot;);
document.getElementById(curBtn).classList.remove(&quot;selected&quot;);
document.getElementById(btnName).classList.add(&quot;selected&quot;);
curBtn = btnName;
}

.menu {
background-color: cornflowerblue;
}
.btn-group .button {
background-color: #4CAF50;
/* Green */
border: 1px solid green;
color: white;
padding: 15px 32px;
text-align: center;
text-decoration: none;
font-size: 16px;
cursor: pointer;
width: 150px;
display: block;
}
.btn-group .button.visited {
background-color: rgb(33, 31, 31);
background-image: none;
color: rgb(255, 234, 0);
}
.btn-group .button.selected {
color: rgb(17, 15, 15);
background-image: linear-gradient(to bottom, rgb(92, 88, 46), rgb(247, 229, 41), rgb(92, 88, 46));
}
.btn-group .button:hover {
background-image: linear-gradient(to bottom, rgb(92, 88, 46),
rgb(247, 229, 41),
rgb(92, 88, 46));
color: red;
}

&lt;div class=&quot;menu&quot;&gt;
&lt;div class=&quot;btn-group&quot;&gt;
&lt;button id=&quot;WhatsNew&quot; onclick=&quot;btnClick(&#39;WhatsNew&#39;)&quot; class=&quot;button&quot;&gt;What&#39;s New&lt;/button&gt;
&lt;button id=&quot;Button1&quot; onclick=&quot;btnClick(&#39;Button1&#39;)&quot; class=&quot;button&quot;&gt;Button1&lt;/button&gt;
&lt;button id=&quot;Button2&quot; onclick=&quot;btnClick(&#39;Button2&#39;)&quot; class=&quot;button&quot;&gt;Button2&lt;/button&gt;
&lt;button id=&quot;Button3&quot; onclick=&quot;btnClick(&#39;Button3&#39;)&quot; class=&quot;button&quot;&gt;Button3&lt;/button&gt;
&lt;button id=&quot;Button4&quot; onclick=&quot;btnClick(&#39;Button4&#39;)&quot; class=&quot;button&quot;&gt;Button4&lt;/button&gt;
&lt;/div&gt;
&lt;/div&gt;

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