如何在加载时显示进度条，使用 ajax [英] How to show progress bar while loading, using ajax

问题描述

我有一个下拉框.当用户从下拉框中选择一个值时，它会执行查询以从数据库中检索数据，并使用 ajax 在前端显示结果.这需要一点时间，所以在这段时间里，我想显示一个进度条.我已经搜索过，并且发现了许多关于为上传创建进度条的教程，但我不喜欢任何教程.有人可以为我提供一些有用的指导吗?

I have a dropdown box. When the user selects a value from the dropdown box, it performs a query to retrieve the data from the database, and shows the results in the front end using ajax. It takes a little bit of time, so during this time, I want to show a progress bar. I have searched, and I have found numerous tutorials on creating progress bars for uploads, but I haven't liked any. Can anybody provides some helpful guidance for me?

我的ajax代码:

<script>
$(function() {
    $("#client").on("change", function() {
      var clientid=$("#client").val();

        $.ajax({
            type:"post",
            url:"clientnetworkpricelist/yourfile.php",
            data:"title="+clientid,
            success:function(data){
             $("#result").html(data);
            }
        });

    });
});
</script>

推荐答案

这个 link 描述了如何使用 jquery 向 xhr 对象添加进度事件侦听器.

This link describes how you can add a progress event listener to the xhr object using jquery.

$.ajax({
    xhr: function() {
        var xhr = new window.XMLHttpRequest();

        // Upload progress
        xhr.upload.addEventListener("progress", function(evt){
            if (evt.lengthComputable) {
                var percentComplete = evt.loaded / evt.total;
                //Do something with upload progress
                console.log(percentComplete);
            }
       }, false);
       
       // Download progress
       xhr.addEventListener("progress", function(evt){
           if (evt.lengthComputable) {
               var percentComplete = evt.loaded / evt.total;
               // Do something with download progress
               console.log(percentComplete);
           }
       }, false);
       
       return xhr;
    },
    type: 'POST',
    url: "/",
    data: {},
    success: function(data){
        // Do something success-ish
    }
});

这篇关于如何在加载时显示进度条，使用 ajax的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！