How to incrementally add elements in jquery

As a popular JavaScript library, jQuery can not only improve development efficiency, but also make the code simpler and easier to understand. When developing web pages, we usually use jQuery to add, modify, and delete HTML elements.

In many cases, we need to incrementally add elements, that is, add new sub-elements to existing elements. At this time, jQuery's append() and prepend() methods can come in handy. These two methods are one of the most commonly used methods in jQuery. They can add child elements at the end and head of the element respectively.

First of all, we need to understand the usage and differences of these two methods.

append() and prepend() methods

append()

The append() method inserts content after the last child element of an existing element. Here's some sample code:

$(document).ready(function(){
  $("p").append(" 这是新的内容。");
});

This will add new content to all

elements. If you want to add new content to all elements in the document, you can use it like this:

$(document).ready(function(){
  $("*").append(" 这是新的内容。");
});

prepend()

prepend() method is the first child element of an existing element Insert content in front of. Here's some sample code:

$(document).ready(function(){
  $("p").prepend(" 这是新的内容。");
});

This will add new content to all

elements. If you want to add new content to all elements in the document, you can use it like this:

$(document).ready(function(){
  $("*").prepend(" 这是新的内容。");
});

Incrementally add elements

If we need to add new sub-elements within existing elements , you can use the append() or prepend() method. Here is some sample code:

$(document).ready(function(){
  $(".container").append("<div> 这是新增的元素。</div>");
});

This will add a new element after the last child element of the element with class name container.

$(document).ready(function(){
  $(".container").prepend("<div> 这是新增的元素。</div>");
});

This will add a new element in front of the first child element of the element with class name container.

If we need to add the same sub-elements to each element, we can use the each() method to iterate the elements one by one and add them incrementally.

$(document).ready(function(){
  $("p").each(function(){
    $(this).append(" 这是新增的内容。");
  });
});

This will add the same content to each

element.

Conclusion

When adding elements incrementally, we can use the append() and prepend() methods in jQuery. These methods provide a quick and easy way to modify HTML elements. We can also use each() method to iterate over multiple elements and perform the same operation. This can help us quickly build interactively rich web pages and improve development efficiency.

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