使用jquery addClass()方法的javascript函数不添加类

Question

脚本可以正常工作，可以正确创建所有内容等等，但是 jquery addClass 方法没有添加类。我不熟悉在 javascript 函数中使用 jquery 方法，感谢任何帮助，包括在不使用 jquery 的情况下添加适当类的替代方法。

function thumbnail(Img, Element, Modal, ModalTitle) {
"use strict";
/*jslint browser:true*/
/*global $, jQuery*/
//this function will append an anchor tag with the appropriate functionality, accepting inputs on the image filename, attaching element, and modal
//Img = full filename in format of foo.png
//Element = the ID of the element within which the thumbnail anchor will be placed
//Modal = the ID of the modal
//ModalTitle = Text used for title of the modal and title of the caption
var image, element, modal, loc, output, iUrl, modal_loc, modal_output, mtitle;
image = Img;
element = Element;
modal = Modal;
mtitle = ModalTitle;
iUrl = "/design-library/images/thumbs/" + image;
output = "<a href='#' data-reveal-id='" + modal + "'>";
output += "<img class='sample_img' src='" + iUrl + "' alt='" + mtitle + "' />";
output += "</a>";
output += "<p class='caption'>" + mtitle + "</p>";
modal_output = "<h1>" + mtitle + "</h1>";
modal_output += "<img src='" + iUrl + "' alt='" + image + "' /><a class='close-reveal-modal'>&#215;</a>";
//create the modal container
$(modal).addClass('reveal-modal');
modal_loc = document.getElementById(modal);
modal_loc.innerHTML = modal_output;
//the end of the script gets the element and adds the anchor tag that exists in output
$(element).addClass('samples');
loc = document.getElementById(element);
loc.innerHTML = output;
}

Answer 1

由于 modal 和 element 是 ID，您应该更正您的选择器以将它们用作一个:

$('#' + modal).addClass('reveal-modal');
$('#' + element).addClass('samples');

旁注。使用 jQuery 找到 DOM 元素后，无需使用 getElementById 执行第二次搜索:

var modal_loc = $('#' + modal);
modal_loc.addClass('reveal-modal');
modal_loc.html(modal_output);