jquery's appendto fails

When using jQuery to develop web pages, you often encounter situations where you need to dynamically add HTML elements. One of the ways to add elements is to use jQuery's appendTo() method to add the newly created element to the specified element. But sometimes you will find that this method seems to be invalid, and the element is not added to the specified element. So what is the reason for this situation and how to solve it?

1. Possible reasons

1. jQuery is not loaded or the loading order is incorrect

When using any method of jQuery, you should first confirm the jQuery library has been loaded correctly. If jQuery is not loaded correctly, the browser cannot find this method and naturally cannot add the element to the specified element.

In addition, if there are problems with jQuery loading, such as conflicts with other JS files, then the appendTo() method will also fail.

Solution:

• Confirm whether the file path and import method of the jQuery library are correct;
• Place the import of jQuery before all JS files.

2. The element added does not exist or the ID is wrong

If the element you try to add does not exist or the ID is wrong, appendTo() method It will also fail. At this time, because jQuery cannot find the added target element, it will not add it.

Solution:

• Confirm whether the added target element exists. If it does not exist, you can consider adding a new element or modifying the element position;
• Confirm that it is Whether the ID of the added target element is correct, the ID is case-sensitive.

3. Code logic error

If there is a logic error in the code that calls the appendTo() method, it will also prevent the element from being added to in the specified element.

You can check the following issues:

• Whether there are grammatical errors, missing semicolons, mismatched brackets;
• Whether # is missing from the conditional judgment statement ##appendTo() method;
Whether the
• appendTo() method is used in asynchronous requests, asynchronous requests need to add a callback function for delayed execution.

Solution:

Check the code carefully to see if there are grammatical errors or logical problems;
• Debug the code to see if it is executed to the specified
• appendTo()Method.

2. Solution

Clear usage scenarios

When using the

appendTo() method, you need to be clear Some prerequisites, such as this method is best executed after the DOM element is loaded, and related operations can be performed after the page is loaded.

In addition, if the addition of elements involves the impact of size and position, it is best to add them after the style is loaded.

$(window).on('load', function () {
  // DOM的元素加载完成
  $("...")
    .appendTo("...")
    .show();
});

Use chain calls

When using the

appendTo() method, you can use chain calls to ensure that each method is executed After finishing, proceed to the next method.

$("...")
  .appendTo("...")
  .show();  

Save elements into variables

Before adding elements, you can save the elements to be added into variables to facilitate calling the variable for addition operations.

var newElement = $("<div>新建元素</div>");
newElement.appendTo("...");

Use
4. HTML() Method

If the added element content is relatively simple, you can use

HTML() directly method.

$("...")
  .html("<div>新建元素</div>")
  .appendTo("...")
  .show();

3. Summary

appendTo() Method failure may be caused by jQuery not being loaded, the added element not existing or ID error, code logic error, etc. . To solve this problem, first determine the cause of the error and then take appropriate resolution measures. When using this method, you need to consider factors such as DOM loading, style loading, and code execution order. Only by calling this method properly can you ensure that elements are smoothly added to the specified element.

The above is the detailed content of jquery's appendto fails. For more information, please follow other related articles on the PHP Chinese website!