如何将 jQuery 插件功能限制为仅某些元素? [英] How to limit a jQuery plugin function to only some elements?

问题描述

我查看了 jQuery 插件网站，它教我如何编写基本插件:

I check the jQuery plugin site, which teach me how to write a basic plugin:

(function( $ ){
  $.fn.maxHeight = function() {
    var max = 0;
    this.each(function() {
      max = Math.max( max, $(this).height() );
    });
    return max;
  };
})( jQuery );

然后，div 可以有 maxHeight 方法，像这样:

Then, the div can have the maxHeight method, like this:

var tallest = $('div').maxHeight(); // Returns the height of the tallest div

但我想只有 textarea 有 maxHeight 功能，而不是 div.我该怎么做?

But I would like to only textarea have maxHeight function, but not the div. How can I do so?

推荐答案

在检查/保存高度之前检查以确保元素是文本区域.

Check to make sure the element is a textarea before checking/saving the height.

this.each(function() {
    if(this.tagName.toLowerCase() === "textarea") {
        max = Math.max( max, $(this).height() );
    }
});

jQuery 插件不会为某些元素提供函数，它们为 jQuery 对象提供函数以处理一组选定的元素.最好的解决方案是让它们尽可能通用，并且只在需要时调用 $("textarea").maxHeight() .您没有对插件中的 textarea 进行任何特定的操作，如果您保留它现在的样子，那么如果 $('div').maxHeight() 成为必需的用例.

jQuery plugins don't give functions to certain elements, they give functions to the jQuery object for working with a set of selected elements. The best solution would be to keep them as generic as possible and only call $("textarea").maxHeight() when you need it. You aren't doing anything specific to textareas in the plugin and if you leave it as it is now, you don't need to make a change to it in the future if $('div').maxHeight() becomes a required use-case.

这篇关于如何将 jQuery 插件功能限制为仅某些元素?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！