jQuery slick.js 中的错误：“未捕获的类型错误：无法读取 null 的属性‘添加’”
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Error in slick.js: "Uncaught TypeError: Cannot read property 'add' of null"
提问by Pooja Mokariya
I used slick js for slider view of image.
我使用光滑的 js 来显示图像的滑块视图。
Here is my code.
这是我的代码。
<div class="slider_wrap add-remove">
<%= f.fields_for :images do |image_form| %>
<%#= render 'images_fields', :f => image_form %>
<div>
<%= image_tag image_form.object.picture.url,:class=>"drop_down_link even img_prev" %>
</div>
<div class="image_upload_div">
<div class="image-upload">
<label>
<i class="fa fa-cloud-upload">
<%= image_form.file_field :picture ,:'data-role'=>"none",:onchange=>"readURL(this);" , :accept => 'image/jpeg , image/png' %>
</i>
</label>
</div>
</div>
<% end %>
<%= f.link_to_add "Add a picture", :images ,:id=>"add_pic" ,:class=>"js-add-slide", :style=>"display: none;"%>
</div>
<script>
function silder(){
slideIndex = 0;
$('.add-remove').slick({
slidesToShow: 2,
slidesToScroll: 2
});
$('.js-add-slide').on('click', function() {
$('.add-remove').slick('slickAdd');
});
$('.js-remove-slide').on('click', function() {
$('.add-remove').slick('slickRemove');
});
});
function readURL(input) {
if (input.files && input.files[0]) {
var reader = new FileReader();
reader.onload = function (e) {
$('.img_prev').last()
.attr('src', e.target.result)
};
reader.readAsDataURL(input.files[0]);
setTimeout(function(){
$('#add_pic').trigger('click');
silder();
}, 100);
}
}
</script>
Now with this code I got slider working, but its not coming proper I am getting error:
现在使用此代码，我可以使滑块正常工作，但它不正确，我收到错误消息：
Uncaught TypeError: Cannot read property 'add' of null
未捕获的类型错误：无法读取 null 的属性“添加”
回答by Cees Timmerman
That's due to calling init twice. This works without error:
这是由于两次调用 init。这工作没有错误：
$(".slider").not('.slick-initialized').slick()
Also, "silder" looks like a typo.
此外，“silder”看起来像是一个错字。
Relying on a timeout is also error-prone. Unfortunately, Internet Explorer uses a different event to tell you when the HTML elements and JS libraries have been loaded.There are many libraries to avoid the 100 or so lines of cross-browser code, but the popular and relatively small jQuery solves the timing issue like this:
依赖超时也容易出错。不幸的是，Internet Explorer 使用不同的事件来告诉您何时加载了 HTML 元素和 JS 库。有很多库可以避免 100 行左右的跨浏览器代码，但是流行且相对较小的 jQuery 解决了这样的计时问题：
$(function() {
// Handler for .ready() called. Put the Slick Slider etc. init code here.
})
