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[英]How to hide a drop down option based on the selection of another drop down in a form in HTML using Javascript
[英]How to change drop down based on tab selection using javascript
您可以在标签上方创建下拉菜单,这样如果我们切换标签,它不会影响下拉菜单值。 如果您将每个标签都创建为单独的页面,则将无法使用。
请检查我在此处实现的以下代码,我已在标签上方添加了drpdown,因此切换标签不会更改下拉值,这可能对您有所帮助
<body>
<div>
<select>
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="mercedes">Mercedes</option>
<option value="audi">Audi</option>
</select>
</div>
<button class="tablink" onclick="openPage('Home', this, 'red')">Home</button>
<button class="tablink" onclick="openPage('News', this, 'green')" id="defaultOpen">News</button>
<button class="tablink" onclick="openPage('Contact', this, 'blue')">Contact</button>
<button class="tablink" onclick="openPage('About', this, 'orange')">About</button>
<div id="Home" class="tabcontent">
<h3>Home</h3>
<p>Home is where the heart is..</p>
</div>
<div id="News" class="tabcontent">
<h3>News</h3>
<p>Some news this fine day!</p>
</div>
<div id="Contact" class="tabcontent">
<h3>Contact</h3>
<p>Get in touch, or swing by for a cup of coffee.</p>
</div>
<div id="About" class="tabcontent">
<h3>About</h3>
<p>Who we are and what we do.</p>
</div>
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