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如何禁用其他下拉菜单,直到选择第一个下拉菜单?

css html javascript

newuser · 技术社区 · 2 年前

我的项目要求用户在选择任何其他下拉菜单之前先选择“名称”。要做到这一点,如何禁用其他列,直到选择“名称”列?请参阅下面的小提琴和代码。

这是我正在编写的代码。我还包含了我小提琴的链接。谢谢 https://jsfiddle.net/mL9f58wg/

$(document).ready(function() {
$('#table-wrap').hide();
var table = $('#example').DataTable({

responsive: true,
mark: true,
stateSave: false,
searching: true
});

buildSelect(table);
$('#table-filter').on('change', function () {
// show the tbody when the user clicks on a filter option
$('#table-wrap').show();
table.columns.adjust();

table.search(this.value).draw();
});


table.on('draw', function() {
buildSelect(table);
});
$('#test').on('click', function() {
table.search('').columns().search('').draw();
$('#table-wrap').hide();
});
});

function buildSelect(table) {
var counter = 0;
table.columns([0, 1, 2]).every(function() {
var column = table.column(this, {
search: 'applied'
});
counter++;
var select = $('<select id="dd' + counter + '"><option value="">Select</option></select>')
.appendTo($('#dropdown' + counter).empty())
.on('change', function() {
var val = $.fn.dataTable.util.escapeRegex(
$(this).val()
);

column
.search(val ? '^' + val + '$' : '', true, false)
.draw();
});

column.data().unique().sort().each(function(d, j) {
select.append('<option value="' + d + '">' + d + '</option>');

});

// The rebuild will clear the exisiting select, so it needs to be repopulated
var currSearch = column.search();
if (currSearch) {
// Use RegEx to find the selected value from the unique values of the column.
// This will use the Regular Expression returned from column.search to find the first matching item in column.data().unique
select.val(column.data().unique().toArray().find((e) => e.match(new RegExp(currSearch))));
}
});
}

<!DOCTYPE html>
<html>
<head>
<script src="https://code.jquery.com/jquery-1.11.3.min.js"></script>

<link href="https://nightly.datatables.net/css/jquery.dataTables.css" rel="stylesheet" type="text/css" />
<script src="https://nightly.datatables.net/js/jquery.dataTables.js"></script>

<meta charset=utf-8 />
<title>DataTables - JS Bin</title>
</head>
<div class="searchbox" select id="table-filter">
<p><label for="dd1">Name:</label> <span id="dropdown1" input type="checkbox">
</span>
</p>

<p><label for="dd2">Postion:</label> <span id="dropdown2">
</span>
</p>

<p><label for="dd3">Office:</label> <span id="dropdown3">
</span>
</p>
<button type="button" id="test">Clear Filters</button>
</div>
<div id="table-wrap">
<table id="example" class="cell-border row-border stripe dataTable no-footer dtr-inline" role="grid" style=" width: 100%; padding-top: 10px;"><thead>
<tr>

<th>&#160;</th>
<th>&#160;</th>
<th>&#160;</th>
<th colspan="3" style=" text-align: center;">Information</th>
</tr>


<tr>
<th>Name</th>
<th>Position</th>
<th>Office</th>
<th>Age</th>
<th>Start date</th>
<th>Salary</th>
</tr>
</thead>


<tbody>
<tr>
<td>ID.AI</td>
<td>System Architect</td>
<td>Edinburgh</td>
<td>61</td>
<td>2011/04/25</td>
<td>$3,120</td>
</tr>
<tr>
<td>Garrett -2</td>
<td>Director</td>
<td>Edinburgh</td>
<td>63</td>
<td>2011/07/25</td>
<td>$5,300</td>
</tr>
<tr>
<td>Ashton.1 -2</td>
<td>Technical Author</td>
<td>San Francisco</td>
<td>66</td>
<td>2009/01/12</td>
<td>$4,800</td>
</tr>


</tr></tbody></table>
</div>

0 回复 | 直到 2 年前

aabdulahad 2 年前

将字段设置为在文档加载时隐藏,然后将事件侦听器附加到第一个框,并检查用户选择的值,如果是实际名称,则显示其他两个框,如果不是隐藏它们

// Place this whole code block in $(document).ready()

$("span#dropdown2").hide()
$("span#dropdown3").hide()
  
$('span#dropdown1').on('change', function(event) {
  const check = !!event.target.value
  if (check) {
    $("span#dropdown2").show()
    $("span#dropdown3").show()
  } else {
    $("span#dropdown2").hide()
    $("span#dropdown3").hide()
  }
});