使用js添加类和属性

Sorry for my english..

对不起我的英语不好..

I understand that it was done with addClass and removeClass but how to write terms do not understand I need to do so if the screen resolution is less than 768 pixels then add the attributes id="dLabel" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false" and the class "dropdown-menu" to the ul with class small and remove class from li parent class and remove the ul with class nav-child

我知道它是用addClass和removeClass完成的,但是如果屏幕分辨率小于768像素,那么如何编写术语不明白我需要这样做然后添加属性id =“dLabel”type =“button”data-toggle = “dropdown”aria-haspopup =“true”aria-expanded =“false”和类“dropdown-menu”到ul的类小并从li父类中删除类并删除带有nav-child类的ul

UPD

I have this:

我有这个:

<li class="item-104 deeper parent">
  <span class="nav-header ">About</span>
  <ul class="nav-child unstyled small">
   <li class="item-113"><a href="/o-ministerstve/novosti">News</a></li>
  </ul>
</li>

i want do this, when window screen less than 768px:

我希望这样做,当窗口屏幕小于768px时:

<li class="item-104 deeper">
      <span class="nav-header " id="dLabel" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">About</span>
      <ul class="dropdown-menu unstyled small">
       <li class="item-113"><a href="/o-ministerstve/novosti">News</a></li>
      </ul>
    </li>

I want to remove the classes nav-child and parent and add to span attributes

我想删除nav-child和parent类,并添加到span属性

can someone come in handy:

有人会派上用场:

$(function () {
    var window_width = 750; // or $(window).width();

    if ($(window).width() < 768) {
      $('.small').addClass('dropdown-menu');
      $('.deeper').removeClass('parent');
      $('.small').removeClass('nav-child');
      $('.deeper .nav-header').attr({id: 'dLabel', type: 'button', 'data-toggle':'dropdown', 'aria-haspopup':'true', 'aria-expanded': 'false'});
    } else {
      $('.small').removeClass('dropdown-menu');
      $('.deeper').addClass('parent');
      $('.small').addClass('nav-child');
      $('.deeper .nav-header').attr({id: '', type: '', 'data-toggle':'', 'aria-haspopup':'', 'aria-expanded': ''});
    }
});

4 个解决方案

#1

For adding attributes and classes you could use:

要添加属性和类,您可以使用:

$('ul.small').attr({id: 'dLabel', type: 'button', data-toggle:'dropdown', aria-haspopup:'true', aria-expanded: 'false'});
$('ul.small').addClass('dropdown-menu');

Removing is simpler, because then you set the attribute to an empty string:

删除更简单,因为您将属性设置为空字符串:

$('ul.small').attr({id: '', type: '', data-toggle:'', aria-haspopup:'', aria-expanded: ''});

Current size of your windows can be get with:

您当前的窗户大小可以通过以下方式获得:

$( window ).width()

Or do you want this attributes to be given on resize events? Then just try:

或者您希望在调整大小事件时给出此属性吗?然后尝试:

$( window ).resize(function() {
  if ($( window ).width() < 768){
    $('ul.small').addClass('firstClass').addClass('secondClass');
    $('ul.small').attr({id: 'dLabel', type: 'button', data-toggle:'dropdown', aria-haspopup:'true', aria-expanded: 'false'});
  } else {
   $('ul.small').removeClass('firstClass').removeClass('secondClass');
    $('ul.small').attr({id: '', type: '', data-toggle:'', aria-haspopup:'', aria-expanded: ''});
  }
}

After author has edited his question:

在作者编辑了他的问题之后:

var window_width = 750; // or $(window).width();

if ($(window).width() < 768) {
  $('#deeper').removeClass('parent');
  $('#deeper .nav-header').attr({id: 'dLabel', type: 'button', 'data-toggle':'dropdown', 'aria-haspopup':'true', 'aria-expanded': 'false'});
} else {
  $('#deeper').addClass('parent');
  $('#deeper .nav-header').attr({id: '', type: '', 'data-toggle':'', 'aria-haspopup':'', 'aria-expanded': ''});
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<li class="item-104 deeper parent">
  <span class="nav-header ">About</span>
  <ul class="nav-child unstyled small">
   <li class="item-113"><a href="/o-ministerstve/novosti">News</a></li>
  </ul>
</li>

#2

You are using addClass and removeClass, means you have jQuery included. Use this:

您正在使用addClass和removeClass,这意味着您包含了jQuery。用这个:

if($(window ).width() < 768){       // Returns width of browser viewport
     // addClass
 }

#3

Try this :

尝试这个 :

$(document).ready(function(){

    if ($(window).width() < 768) {

        $("ul").attr({id:"dLabel",type:"button",data-toggle:"dropdown",aria-haspopup:"true",aria-expanded="false"});


        $("ul").addClass("dropdown-menu");

        //and rest code..........

    }

    else {

        // go back Default...
    }

})

#4

alternative: draw both types and hide one or other using CSS.

替代方法:使用CSS绘制两种类型并隐藏一种或另一种。

@media screen and (min-width: 0px) and (max-width: 768px) {
  #first { display: block; }
  #second { display: none; }
}

@media screen and (min-width: 768px) {
  #first { display: none; }
  #second { display: block; }
}

much easier to design and debug in my opinion

在我看来,设计和调试更容易

#1