jquery changes the image QR code path but does not display it

With the vigorous development of the mobile Internet, QR codes have become a very popular method of information transmission in modern society. In web development, we often need to use jQuery to operate elements in web pages, including the path of QR code images. However, in actual operation, we often encounter a difficult problem, that is, the QR code image cannot be displayed after changing the path. This article will give you a detailed introduction to the reasons and solutions for jQuery changing the QR code path of images not to be displayed.

1. Problem manifestation

In web development, we often need to change the path of the QR code image according to specific needs. The code example is as follows:

$("#qrcode").attr("src", "/images/qrCode_new.png");

This code The function is to change the image path of the element with id qrcode to /images/qrCode_new.png. However, when we run this code, we are likely to encounter a problem, that is, the QR code image cannot be displayed.

2. Causes of the problem

There may be many reasons for the above problems. Let’s analyze some common situations.

1. Image path error
First of all, we need to determine whether the new path of the QR code image is correct. If the path is wrong, the picture will naturally not be displayed. Therefore, before changing the image path, we need to confirm whether the path is correct. Generally speaking, it is more convenient to use relative paths, but it should be noted that the directory of the relative path may be different from the current HTML file, so you need to pay special attention to the accuracy of the path.

2. Network problem
Secondly, we need to confirm whether the network connection is normal. If there is a problem with the network connection, the images may not load properly. We can troubleshoot by checking the browser console or network monitoring tools.

3. File name case issue
In the Linux file system, the file name is case-sensitive. If we reference a file name with incorrect capitalization in the code, the image will not display properly.

4. Image format issue
Finally, we need to confirm whether the format of the image is correct. If the image format is not correct, the web browser will not be able to load the image properly.

The above are some situations that may cause the QR code image to be unable to be displayed. Next, we will introduce how to solve these problems.

3. Solution

1. Check whether the path is correct
If we are sure that the path is correct, but the image still cannot be displayed, we can try to use an absolute path to reference the image. The code to change the original path to an absolute path is as follows:

$("#qrcode").attr("src", "http://www.example.com/images/qrCode_new.png");

If the image can be displayed normally using an absolute path, the path problem can be determined.

2. Check the network connection
If there is a problem with the network connection, you can try to reconnect to the network or use another network.

3. Check the case of file names
In the Linux file system, the case of file names is sensitive. Therefore, we need to ensure that the file name referenced in the code has the same case as the actual file name.

4. Check the image format
Make sure the image format is correct. Generally, the QR code image format is PNG or JPEG. If the format is wrong, you can convert the image to the correct format and try again.

4. Summary

The above are the reasons and solutions for jQuery changing the QR code path of images not to be displayed. If the QR code image cannot be displayed normally, we need to check the above possible problems one by one to find a solution as soon as possible.

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