为我的html页面创建一个微调器 [英] create a spinner for my html page

问题描述

我有一个用户需要提交给服务器的Web表单。服务器响应可能需要几秒钟。所以我想向用户展示一个微调框，以便所有其他字段都变灰，并且用户在Web窗体中进行任何更改，并且在中心我有一个微调框持续旋转。请帮助我如何继续。

I have a web form which the user needs to submit to the server. The server response may take seconds. So I want to show the user a spinner, such that all other fields are grayed and the user make any changes in the webform and in the center I have a spinner which keeps rotating.. Please help me in how should I proceed..

推荐答案

以下是我的完整解决方案，使用ajax发送查询（如果通过使用离开页面，则不能拥有微调器标准表格帖子）：

Here's my complete solution, using ajax to send the query (you can't have a spinner if you leave the page by using a standard form post) :

loading = {
    count: 0
};

loading.finish = function() {
    this.count--;
    if (this.count==0) this.$div.hide();
};

// 
loading.start = function() {
    this.count++;
    if (!this.$div) {
        var html = '<div style="position: fixed;z-index:100;left:0;top:0;right:0;bottom:0;background: black;opacity: 0.6;">';
        html += '<table width=100% height=100%>';
        html += '<tr><td align=center valign=middle>';
        html += '<img src=img/loading.gif>';
        html += '</td></tr>';
        html += '</table></div>';
        this.$div=$(html);
        this.$div.prependTo('body');
    }
    setTimeout(function(){
        if (loading.count>0) loading.$div.show();
    }, 500);
};

// the function to call
askUrl = function(url, success) {
    var httpRequest = new XMLHttpRequest();
    httpRequest.onreadystatechange = function() {
        if (httpRequest.readyState === 4) {
            if (httpRequest.status === 200) {
                success(msg);
            }
            loading.finish();
        }
    };
    loading.start();
    httpRequest.open('GET', url);
    httpRequest.send();
};

如果您调用askUrl并且服务器在500毫秒内没有应答，则屏幕变灰，微调器显示。

If you call askUrl and the servers doesn't answer in 500 ms, the screen is greyed and a spinner is displayed.

我在这里获得了我的gif spinner 。

I got my gif spinner here.

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