我正在使用CakePHP构建的应用程序中的几个表单字段会收集其值的百分比。我希望用户以熟悉的百分比(24.5%)格式查看和编辑百分比,但是我想以十进制(.245)格式存储它以便简化计算逻辑。由于其中有多个字段,因此我不必为每个百分比字段将转换逻辑写入控制器。
有谁知道自动执行此转换的简单解决方案,还是我坚持编写自定义帮助程序/行为来解决此问题?
解
我最终写了一个处理此问题的jQuery插件。对于将来可能需要它的任何人来说,它就是这里:
/**
* Input Percent
*
* Percentages are tricky to input because users like seeing them as 24.5%, but
* when using them in calculation their value is actually .245. This plugin
* takes a supplied field and automatically creates a percentage input.
*
* It works by taking an input element and creating a hidden input with the same
* name immediately following it in the DOM. This has the effect of submitting
* the proper value instead of the human only one. An onchange method is then
* bound to the original input in order to keep the two synced.
*
* Potential Caveats:
* * There will be two inputs with the same name. Make sure anything you
* script against this field is prepared to handle that.
*
* @author Brad Koch <kochb@aedisit.com>
*/
(function($) {
$.fn.inputPercent = function() {
return this.each(function() {
var display_field = this;
var value_field = $('<input type="hidden" />').get(0);
// Initialize and attach the hidden input.
$(value_field).attr('name', $(this).attr('name'));
$(value_field).val($(display_field).val());
$(display_field).after(value_field);
$(display_field).after('%');
// Convert the display field's proper percent value into the display format.
if (isFinite($(display_field).val())) {
$(display_field).val($(display_field).val() * 100);
}
// Enable synchronization between the two.
$(this).bind('change', function () {
var value = $(display_field).val();
// Handle non-numeric values.
if (isFinite(value)) {
$(value_field).val(value / 100);
} else {
$(value_field).val(value);
}
});
});
};
})(jQuery);
用法:
$('input.percent').inputPercent();
最佳答案
您可以在提交之前编写一些简单的javascript(使用您喜欢的框架或纯js)来转换具有#percentage类的字段。
或者,也可以与没有javascript的用户打交道;在模型中,添加beforeSave()方法,检查数字是否小于1,如果不是,则除以100。
如果NumberHelper无法帮助,您还可以添加一个简单的组件或帮助器以将内部数字转换回显示的百分比。