[英]HTML and Javascript search bootstrap cards
在搜索表单上键入时,Javascript 返回:“未捕获的类型错误:无法读取 null 的属性‘innerText’”。
我有一个包含一些 Bootstrap 卡片的页面,我想按名称过滤卡片。 我试图获取“卡片标题”元素类来验证搜索过滤器。
HTML代码:
<div class="container">
<div class="row">
<div class="col-sm-4 mb-4">
<input type="text" id="myFilter" class="form-control" onkeyup="myFunction()" placeholder="Search for card name...">
</div>
</div>
<div class="row" id="myProducts">
<div class="col-md-4">
<div class="card">
<div class="card-header bg-dark d-sm-flex justify-content-sm-between align-items-sm-center">
<div class=" card-title">
<a href="#" style="color:white" class="display-inline- block" onmouseover="this.style.color='#00e6ac'" onmouseout="this.style.color='#fff'">
<strong>Card 1</strong>
</a>
</div>
</div>
<div class="card-body bg-light">
0000x01
</div>
<div class="card-footer bg-white d-flex justify-content-between">
<div>
<i class="icon-arrow-right5 mr-2"></i>Card number one
</div>
</div>
</div>
<div class="card">
<div class="card-header bg-dark d-sm-flex justify-content-sm-between align-items-sm-center">
<div class=" card-title">
<a href="#" style="color:white" class="display-inline- block" onmouseover="this.style.color='#00e6ac'" onmouseout="this.style.color='#fff'">
<strong>Card 2</strong>
</a>
</div>
</div>
<div class="card-body bg-light">
0000x02
</div>
<div class="card-footer bg-white d-flex justify-content-between">
<div>
<i class="icon-arrow-right5 mr-2"></i>Card number two
</div>
</div>
</div>
</div>
<!-- /transparent header, white footer -->
</div>
</div>
Javascript
function myFunction() {
var input, filter, cards, cardContainer, title, i;
input = document.getElementById("myFilter");
filter = input.value.toUpperCase();
cardContainer = document.getElementById("myProducts");
cards = cardContainer.getElementsByClassName("card");
for (i = 0; i < cards.length; i++) {
title = cards[i].querySelector("card-title");
if (title.innerText.toUpperCase().indexOf(filter) > -1) {
cards[i].style.display = "";
} else {
cards[i].style.display = "none";
}
}
}
也在测试: https : //codepen.io/pratykus/pen/WNeJpyK
每次我在过滤器框上输入时,我都会收到递增的错误:(6) Uncaught TypeError: Cannot read property 'innerText' of null
当您使用.querySelector
您应该指定class or the element
。 在您的情况下,您的元素是 div 而您尝试访问的类是card-title
,因此更改:
title = cards[i].querySelector("card-title");
到:
title = cards[i].querySelector(".card-title");
如果您将 CSS 类作为选择器传递给querySelector()
,则必须在其后附加 dot .
title = cards[i].querySelector(".card-title");
进行此更改以解决问题。
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