


Example to explain Ajax implementation of simple progress bar with percentage
Recently I encountered such a requirement in a project. When performing operations such as long-distance file transfer and saving, a progress bar with a percentage can be displayed on the page to give the user a good interactive experience. The following is an example code to introduce to you the ajax-based To achieve the effect of a percentage progress bar, friends who need it can refer to it. I hope it can help everyone.
Requirement: When performing operations such as long-distance file transfer and saving, a progress bar with a percentage can be displayed on the page to give the user a good interactive experience
Implementation steps
JSP page
1. Add table tag
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This table tag should be hidden and displayed when the progress bar is executed. The IDs tdOne and tdTwo are the blue and gray areas of the progress bar respectively.
2. Add js code
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When you click save, the loading() method is executed.
Action class
progressBar() method
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save() method
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Note: The code segment can be divided into points in complex business. The percentage of the progress of a point is then stored in the Session, and then the value is obtained from the Session by calling the service through ajax, and the progress is returned and displayed.
Effect
When entering data and clicking [Save]:
Summary
The progress bar with percentage is actually implemented by using ajax to open multiple threads during saving:
One thread performs the saving operation:
1. The percentage is calculated and placed in the session;
2. When the thread ends, clear the session.
Another thread, get the percentage content from the session:
1. Use ajax to return the results and display them on the page
Related recommendations:
Introduction to several methods of implementing progress bars using JavaScript
JavaScript implementing audio control progress bars
How to use php and ajaxForm Example of implementing asynchronous file upload with progress bar
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