我有3套问题。在任何给定的时间我只显示其中一个。如何从显示的问题集中找到所选问题的值？
<div id = "insert_questions" style="display: none">
<b><p>Questions on Insert Operation</p></b>
<form action="">
<input type="radio" name="radio" value="i1" checked="checked">Insert 44 to the binary search tree.<br>
Output: <textarea class="scrollabletextbox" id="answeri1" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br><br>
<input type="radio" name="radio" value="i2">Insert 56 to the binary search tree.<br>
Output: <textarea class="scrollabletextbox" id="answeri2" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br><br>
<input type="radio" name="radio" value="i3">Insert 68 to the binary search tree.<br>
Output: <textarea class="scrollabletextbox" id="answeri3" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br><br>
<input type="radio" name="radio" value="i4">Mark the parent node of the newly added node?<br>
Output: <textarea class="scrollabletextbox" id="answeri4" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br><br>
<br><input type="radio" name="radio" value="i5">What is the height of the newly formed tree?<br>
Output: <textarea class="scrollabletextbox" id="answeri5"></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br>
</form>
</div>
<div id = "delete_questions" style="display: none">
<b><p>Questions on Delete Operation</p></b>
<form action="">
<input type="radio" name="radio" value="d1" checked="checked">Delete the root of the tree<br>
Output: <textarea class="scrollabletextbox" id="answerd1" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br>
<input type="radio" name="radio" value="d2">Delete the 3rd largest value in the remaining tree<br>
Output: <textarea class="scrollabletextbox" id="answerd2" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br>
<input type="radio" name="radio" value="d3">Mark the child node(s), if any, of the node which replaced the deleted node in (2).<br>
Output: <textarea class="scrollabletextbox" id="answerd3" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br>
<input type="radio" name="radio" value="d4">What is the height of the newly formed tree?<br>
Output: <textarea class="scrollabletextbox" id="answerd4" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br>
</form>
</div>
<div id = "misc_questions" style="display: none">
<b><p>Miscellaneous questions</p></b>
<form action="">
<input type="radio" name="radio" value="m1" checked="checked">Do the inorder traversal of tree.<br>
Output: <textarea class="scrollabletextbox" id="answerm1" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br>
<input type="radio" name="radio" value="m2">Do the preorder traversal of tree.<br>
Output: <textarea class="scrollabletextbox" id="answerm2" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br>
<input type="radio" name="radio" value="m3">Do the postorder traversal of tree.<br>
Output: <textarea class="scrollabletextbox" id="answerm3" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br>
<input type="radio" name="radio" value="m4">Mark the lowest common ancestor of the first two leaf nodes(from left)?<br>
Output: <textarea class="scrollabletextbox" id="answerm4" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br>
</form>
</div>
答案 0 :(得分：1)
为每个问题添加一个课程div：
<div id="insert_questions" class="questions">
然后，您可以使用 querySelector() 来定位已检查的input，如下所示：
document.querySelector('.questions:not([style*="display: none"]) input:checked').value
var ins = document.getElementById('insert_questions'),
del = document.getElementById('delete_questions'),
misc = document.getElementById('misc_questions');
var currentAlg = {
submitAnswer: function() {
console.log(document.querySelector('.questions:not([style*="display: none"]) input:checked').value);
console.log('Submitted');
}
}
document.querySelector('.buttons').addEventListener('click', function(e) {
ins.style.display = 'none';
del.style.display = 'none';
misc.style.display = 'none';
document.getElementById(e.target.id + '_questions').style.display = 'block';
});#insert_questions,
#delete_questions,
#misc_questions {
display: none;
}<div class="buttons">
<button id="insert">Insert questions</button>
<button id="delete">Delete questions</button>
<button id="misc">Miscellaneous questions</button>
</div>
<div id="insert_questions" class="questions">
<b> <p> Questions on Insert Operation </p></b>
<form action="">
<input type="radio" name="radio" value="i1" checked="checked">Insert 44 to the binary search tree.
<br>Output:
<textarea class="scrollabletextbox" id="answeri1" readonly></textarea>
<input type="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type="button" onclick="currentAlg.resetAnswer()" value="Reset" />
<br>
<br>
<input type="radio" name="radio" value="i2">Insert 56 to the binary search tree.
<br>Output:
<textarea class="scrollabletextbox" id="answeri2" readonly></textarea>
<input type="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type="button" onclick="currentAlg.resetAnswer()" value="Reset" />
<br>
<br>
<input type="radio" name="radio" value="i3">Insert 68 to the binary search tree.
<br>Output:
<textarea class="scrollabletextbox" id="answeri3" readonly></textarea>
<input type="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type="button" onclick="currentAlg.resetAnswer()" value="Reset" />
<br>
<br>
<input type="radio" name="radio" value="i4">Mark the parent node of the newly added node ?
<br>Output :
<textarea class="scrollabletextbox" id="answeri4" readonly></textarea>
<input type="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type="button" onclick="currentAlg.resetAnswer()" value="Reset" />
<br>
<br>
<br>
<input type="radio" name="radio" value="i5">What is the height of the newly formed tree ?
<br>Output :
<textarea class="scrollabletextbox" id="answeri5"></textarea>
<input type="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type="button" onclick="currentAlg.resetAnswer()" value="Reset" />
<br>
</form>
</div>
<div id="delete_questions" class="questions">
<b> <p> Questions on Delete Operation </p></b>
<form action="">
<input type="radio" name="radio" value="d1" checked="checked">Delete the root of the tree
<br>Output:
<textarea class="scrollabletextbox" id="answerd1" readonly></textarea>
<input type="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type="button" onclick="currentAlg.resetAnswer()" value="Reset" />
<br>
<input type="radio" name="radio" value="d2">Delete the 3rd largest value in the remaining tree
<br>Output:
<textarea class="scrollabletextbox" id="answerd2" readonly></textarea>
<input type="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type="button" onclick="currentAlg.resetAnswer()" value="Reset" />
<br>
<input type="radio" name="radio" value="d3">Mark the child node(s), if any, of the node which replaced the deleted node in (2).
<br>Output:
<textarea class="scrollabletextbox" id="answerd3" readonly></textarea>
<input type="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type="button" onclick="currentAlg.resetAnswer()" value="Reset" />
<br>
<input type="radio" name="radio" value="d4">What is the height of the newly formed tree ?
<br>Output :
<textarea class="scrollabletextbox" id="answerd4" readonly></textarea>
<input type="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type="button" onclick="currentAlg.resetAnswer()" value="Reset" />
<br>
</form>
</div>
<div id="misc_questions" class="questions">
<b> <p> Miscellaneous questions </p></b>
<form action="">
<input type="radio" name="radio" value="m1" checked="checked">Do the inorder traversal of tree.
<br>Output:
<textarea class="scrollabletextbox" id="answerm1" readonly></textarea>
<input type="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type="button" onclick="currentAlg.resetAnswer()" value="Reset" />
<br>
<input type="radio" name="radio" value="m2">Do the preorder traversal of tree.
<br>Output:
<textarea class="scrollabletextbox" id="answerm2" readonly></textarea>
<input type="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type="button" onclick="currentAlg.resetAnswer()" value="Reset" />
<br>
<input type="radio" name="radio" value="m3">Do the postorder traversal of tree.
<br>Output:
<textarea class="scrollabletextbox" id="answerm3" readonly></textarea>
<input type="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type="button" onclick="currentAlg.resetAnswer()" value="Reset" />
<br>
<input type="radio" name="radio" value="m4">Mark the lowest common ancestor of the first two leaf nodes(from left) ?
<br>Output :
<textarea class="scrollabletextbox" id="answerm4" readonly></textarea>
<input type="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type="button" onclick="currentAlg.resetAnswer()" value="Reset" />
<br>
</form>
</div>
答案 1 :(得分：0)
一个选项是使用jQuery。
添加一个类=＆＃34;问题＆＃34;包裹表格的div。
例如：
$(document).ready(function() {
$('.questions:visible').each(function() {
console.log("In the div with id: " + $(this).attr('id'));
var checkedRadioButtonValue = $(this).find('form input[name=radio]:checked').val();
console.log("the value of the checked radio is: " + checkedRadioButtonValue);
});
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="questions" id = "insert_questions" style="display: none;">
<b><p>Questions on Insert Operation</p></b>
<form action="">
<input type="radio" name="radio" value="i1" checked="checked">Insert 44 to the binary search tree.<br>
Output: <textarea class="scrollabletextbox" id="answeri1" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br><br>
<input type="radio" name="radio" value="i2">Insert 56 to the binary search tree.<br>
Output: <textarea class="scrollabletextbox" id="answeri2" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br><br>
<input type="radio" name="radio" value="i3">Insert 68 to the binary search tree.<br>
Output: <textarea class="scrollabletextbox" id="answeri3" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br><br>
<input type="radio" name="radio" value="i4">Mark the parent node of the newly added node?<br>
Output: <textarea class="scrollabletextbox" id="answeri4" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br><br>
<br><input type="radio" name="radio" value="i5">What is the height of the newly formed tree?<br>
Output: <textarea class="scrollabletextbox" id="answeri5"></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br>
</form>
</div>
<div class="questions" id = "delete_questions" style="display: block">
<b><p>Questions on Delete Operation</p></b>
<form action="">
<input type="radio" name="radio" value="d1" >Delete the root of the tree<br>
Output: <textarea class="scrollabletextbox" id="answerd1" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br>
<input type="radio" name="radio" value="d2" checked="checked">Delete the 3rd largest value in the remaining tree<br>
Output: <textarea class="scrollabletextbox" id="answerd2" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br>
<input type="radio" name="radio" value="d3">Mark the child node(s), if any, of the node which replaced the deleted node in (2).<br>
Output: <textarea class="scrollabletextbox" id="answerd3" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br>
<input type="radio" name="radio" value="d4">What is the height of the newly formed tree?<br>
Output: <textarea class="scrollabletextbox" id="answerd4" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br>
</form>
</div>
<div class="questions" id = "misc_questions" style="display: none">
<b><p>Miscellaneous questions</p></b>
<form action="">
<input type="radio" name="radio" value="m1">Do the inorder traversal of tree.<br>
Output: <textarea class="scrollabletextbox" id="answerm1" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br>
<input type="radio" name="radio" value="m2">Do the preorder traversal of tree.<br>
Output: <textarea class="scrollabletextbox" id="answerm2" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br>
<input type="radio" name="radio" value="m3">Do the postorder traversal of tree.<br>
Output: <textarea class="scrollabletextbox" id="answerm3" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br>
<input type="radio" name="radio" value="m4" checked="checked">Mark the lowest common ancestor of the first two leaf nodes(from left)?<br>
Output: <textarea class="scrollabletextbox" id="answerm4" readonly></textarea>
<input type ="button" onclick="currentAlg.submitAnswer()" value="Submit" />
<input type ="button" onclick="currentAlg.resetAnswer()" value="Reset" /><br>
</form>
</div>