[英]Onchange jQuery Event for Dropdown
我有3個選擇器的下拉列表。 我想展示每個選擇器onchange的內容。 有人可以幫忙嗎?
Codeply: https ://www.codeply.com/go/M5JCiCq2qo
function myFunction() { var x = document.getElementById("filter-extras").value; document.getElementById("extra-filter").innerHTML = "You selected: " + x; }
<label class="col-md-12 pl-0">Select Type</label> <select class="form-control custom-select mb-3 col-md-4" onchange="myFunction()" id="filter-extras"> <option selected="selected" value="fuel">Fuel replacement</option> <option value="wifi">Portable WiFi hotspot</option> <option value="cleaning">Post-trip cleaning</option> </select> <div>Content for Fuel replacement</div> <div>Content for Portable WiFi hotspot</div> <div>Content for Post-trip cleaning</div>
我認為使用jQuery會更容易。
使用普通的JS仍然可以很容易地做到這一點。 您只需將change
事件處理程序添加到select
,然后可以使用選擇的value
來選擇要顯示和隱藏所有其他內容的內容,如下所示:
var content = document.querySelectorAll('.content'); document.querySelector('#filter-extras').addEventListener('change', function() { content.forEach(function(el) { el.style.display = 'none'; }); document.querySelector('#' + this.value).style.display = 'block'; });
.content { display: none; }
<label class="col-md-12 pl-0">Select Type</label> <select class="form-control custom-select mb-3 col-md-4" id="filter-extras"> <option selected="selected" value="fuel">Fuel replacement</option> <option value="wifi">Portable WiFi hotspot</option> <option value="cleaning">Post-trip cleaning</option> </select> <div class="content" id="fuel">Content for Fuel replacement</div> <div class="content" id="wifi">Content for Portable WiFi hotspot</div> <div class="content" id="cleaning">Content for Post-trip cleaning</div>
如果您確實想在jQuery中執行此操作,則這里的邏輯翻譯相同:
var $content = $('.content'); $('#filter-extras').on('change', function() { $content.hide(); $('#' + this.value).show(); });
.content { display: none; }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <label class="col-md-12 pl-0">Select Type</label> <select class="form-control custom-select mb-3 col-md-4" id="filter-extras"> <option selected="selected" value="fuel">Fuel replacement</option> <option value="wifi">Portable WiFi hotspot</option> <option value="cleaning">Post-trip cleaning</option> </select> <div class="content" id="fuel">Content for Fuel replacement</div> <div class="content" id="wifi">Content for Portable WiFi hotspot</div> <div class="content" id="cleaning">Content for Post-trip cleaning</div>
我試圖使兩個版本具有相同的行為並顯示默認內容。 在這里,我們簡單地檢查forEach
循環是否id等於所選值:
document.getElementById('filter-extras').addEventListener('change', myFunction) function myFunction() { var x = document.getElementById('filter-extras').value; document.querySelectorAll('.content').forEach(function(element) { if (element.getAttribute('id') === x) { element.style = 'display:block' } else { element.style = 'display:none' } }); } myFunction()
<label class="col-md-12 pl-0">Select Type</label> <select class="form-control custom-select mb-3 col-md-4" id="filter-extras"> <option selected="selected" value="fuel">Fuel replacement</option> <option value="wifi">Portable WiFi hotspot</option> <option value="cleaning">Post-trip cleaning</option> </select> <div class="content" id="fuel">Content for Fuel replacement</div> <div class="content" id="wifi">Content for Portable WiFi hotspot</div> <div class="content" id="cleaning">Content for Post-trip cleaning</div>
$("#filter-extras").on("change", myFunction) function myFunction() { var x = $("#filter-extras").val(); $('.content').each(function() { if ($(this).attr('id') === x) { $(this).show() } else { $(this).hide() } }) } myFunction()
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <label class="col-md-12 pl-0">Select Type</label> <select class="form-control custom-select mb-3 col-md-4" id="filter-extras"> <option selected="selected" value="fuel">Fuel replacement</option> <option value="wifi">Portable WiFi hotspot</option> <option value="cleaning">Post-trip cleaning</option> </select> <div id="fuel" class="content">Content for Fuel replacement</div> <div id="wifi" class="content">Content for Portable WiFi hotspot</div> <div id="cleaning" class="content">Content for Post-trip cleaning</div>
我認為您已經找到答案了,但是如果您想在加載時默認顯示選定的內容,則應將此行添加到代碼中
//因此為了顯示“燃油替換”的內容
$( function({
const contentToShow = $('#filter-extras').val();
$('#' + contentToShow).show();
// after this you can add the code here
$('#filter-extras').change(()=>{
// show hide content here
});
});
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