Restricting Options in jQuery/ajax选择列表

Although there are similar questions posted, my specific issue is that I am unsure of where to place certain information. My goal is to restrict the number of items fetched from a list within the script provided below. The actual script functions correctly, but I need assistance in limiting the retrieval to only six items instead of retrieving everything. While this may seem like a simple task, none of the code snippets I tried from other sources worked for me. Any suggestions?

(function($){
 $.ajax({
            type: "GET",
            url: "/homepage_photo_slider/PhotoGallery.xml", 
            dataType: "xml",
            success: function(xml) {
                $(xml).find('img').each(function() {
                   var location = '/homepage_photo_slider/'; 
                   var url = $(this).attr('src');
                    var alt = $(this).attr('alt');

                    $('<li></li>').html('<a href="'+location+''+url+'" class="pirobox" rel="gallery" title="'+alt+'"><img class="thumb" src="'+location+''+url+'" alt="'+alt+'" title="'+alt+'" /></a>').appendTo('#gallery-ul');

             });
            $().piroBox_ext({
            piro_speed : 700,
            bg_alpha : 0.5,
            piro_scroll : true
    });  
            }       
        });     
})(jQuery);

Answer №1

I haven't tested it, but I believe this code will do the trick. I made a modification in one line, clearly indicated in the comments. By using the slice method, I've reduced the array to only six elements before iterating through each of them with the each function:

(function($){
 $.ajax({
            type: "GET",
            url: "/homepage_photo_slider/PhotoGallery.xml", 
            dataType: "xml",
            success: function(xml) {
                $(xml).find('img').slice(0,6).each(function() { // <--- MODIFIED LINE HERE
                   var location = '/homepage_photo_slider/'; 
                   var url = $(this).attr('src');
                    var alt = $(this).attr('alt');

                    $('<li></li>').html('<a href="'+location+''+url+'" class="pirobox" rel="gallery" title="'+alt+'"><img class="thumb" src="'+location+''+url+'" alt="'+alt+'" title="'+alt+'" /></a>').appendTo('#gallery-ul');

             });
            $().piroBox_ext({
            piro_speed : 700,
            bg_alpha : 0.5,
            piro_scroll : true
    });  
            }       
        });     
})(jQuery);

Answer №2

Consider using a for loop in place of the .each() method for improved efficiency:

var $images = $(xml).find('img');
for(var i = 0; i < 8; i++)
{
    var $image = $($images[i])
    var location = '/photo_gallery/'; 
    var url = $image.attr('src');
    var caption = $image.attr('alt');

    $('<div></div>').html('<a href="'+location+''+url+'" class="lightbox" data-rel="gallery" title="'+caption+'"><img class="thumbnail" src="'+location+''+url+'" alt="'+caption+'" title="'+caption+'" /></a>').appendTo('#images-container');
}

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