The <progress> element of HTML can be used to display task progress. 1. Basic usage defines the progress range through value and max attributes. 2. When the progress is uncertain, the value can be omitted and enters uncertain mode. 3. The progress changes can be achieved through JavaScript. 4. The style can be adjusted through CSS, but attention should be paid to browser compatibility. 5. Degradation should be done in old browsers to ensure compatibility.
Task progress display is actually a very common requirement, such as uploading files, loading data, or completing a certain step. HTML provides a native solution: <progress></progress> element. Not only is it semantic clear, it is also simple to use.
Basic usage and structure
The basic function of the <progress></progress> tag is to show the completion progress of a task. The simplest way to write it only requires a value attribute and a max attribute:
<progress value="50" max="100"></progress>
This displays a progress bar, currently 50% completed and the maximum value is 100%. If you don't set max , the default value is 1, so value should be between 0 and 1:
<progress value="0.75"></progress>
This will work properly, but for the sake of intuitiveness, most people are still used to using integers to represent percentages.
What should I do if I am not sure about the progress?
Sometimes you don't know when the task will be completed, such as waiting for the server to respond or performing a long-running operation. At this time, you can use "indeterminate":
<progress></progress>
As long as value attribute is not added, the browser will display a dynamic progress indication, usually a back and forth animation, telling the user that "in progress", but do not know how much it will be completed.
This state is very suitable for use in the early stage of page loading, data acquisition, or asynchronous requesting process, to avoid misleading users to think it is stuck.
Dynamic update progress in combination with JavaScript
In actual projects, progress often changes dynamically. You can update value attribute of <progress> through JavaScript. For example, listen for progress events when uploading files:
<progress id="upload-progress" value="0" max="100"></progress>
<script>
const progress = document.getElementById('upload-progress');
// Simulate upload progress let current = 0;
const interval = setInterval(() => {
current = 10;
progress.value = current;
if (current >= 100) {
clearInterval(interval);
}
}, 500);
</script> This code simulates the upload process, increasing progress by 10% every half second until it is completed. In actual development, you may get real progress data from XMLHttpRequest or fetch 's onprogress event.
A few points to note:
- Make sure
valuedoes not exceedmax - If you use
max="1", remember to convert the progress into decimal format - Reset the progress bar before the task starts to avoid the last state retention
Style adjustment and compatibility considerations
Although <progress> is a native element, the default styles of different browsers are quite different. If you want to unify the appearance, you can beautify it with CSS.
The basic style can be written like this:
progress {
width: 100%;
height: 20px;
border-radius: 10px;
}However, it should be noted that some browsers (such as Chrome) require special selectors to modify internal styles, such as:
/* Modify the internal color of the progress bar*/
progress::-webkit-progress-value {
background-color: #4caf50;
}
/* Modify the background part*/
progress::-webkit-progress-bar {
background-color: #f1f1f1;
}These pseudo-classes are non-standard, but are supported in most modern browsers. If you are seeking a more consistent appearance, you can also consider manually implementing the progress bar with the div percentage width.
In addition, in some older browsers, <progress></progress> support may not be good enough, so it is recommended to perform a downgrade processing, such as displaying text prompts or hiding elements.
Basically that's it. The <progress></progress> element is not complicated, but it can play a good role in user experience, especially suitable for scenarios where feedback progress is required. Reasonable use allows users to wait for the operation to be completed with greater peace of mind.
The above is the detailed content of The HTML `progress` Element for Task Progress. For more information, please follow other related articles on the PHP Chinese website!
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