Question

我在滚动时遇到自动菜单项问题。因为我的标题有2个菜单，所以看起来像：菜单1＆lt; LOGO＆gt;菜单2;所以我一直在使用这个脚本：

css

是否有可能以某种方式在此脚本中使用2个菜单？我的课程是public class DemoActivity extends Activity { MediaPlayer mp; Button btn; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main_activity); mp = MediaPlayer.create(DemoActivity.this,R.raw.mus); btn = (Button) findViewById(R.id.btnOk); btn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { if (btn.getText().toString().equalsIgnoreCase("play")) { mp.start(); btn.setText("Pause"); } else if (btn.getText().toString().equalsIgnoreCase("pause")) { mp.pause(); btn.setText("Play"); } } }); @Override public void onPause() { super.onPause(); if (mp.isPlaying()) { mp.start(); } else { mp.release(); } } @Override protected void onRestart() { try { if (mp.isPlaying() && mp!=null) { mp.start(); } else { mp.release(); } } catch (IllegalStateException e) { e.printStackTrace(); } super.onRestart(); } @Override protected void onDestroy() { super.onDestroy(); mp.release(); }和// Cache selectors var topMenu = $(".main-nav1"), topMenuHeight = topMenu.outerHeight()+15, // All list items menuItems = topMenu.find("a"), // Anchors corresponding to menu items scrollItems = menuItems.map(function(){ var item = $($(this).attr("href")); if (item.length) { return item; } }); // Bind to scroll $(window).scroll(function(){ // Get container scroll position var fromTop = $(this).scrollTop()+topMenuHeight; // Get id of current scroll item var cur = scrollItems.map(function(){ if ($(this).offset().top < fromTop) return this; }); // Get the id of the current element cur = cur[cur.length-1]; var id = cur && cur.length ? cur[0].id : ""; // Set/remove active class menuItems .parent().removeClass("active") .end().filter("[href=#"+id+"]").parent().addClass("active"); });。我真的需要jQuery的帮助，因为我是这种语言的新手！

Answer 1

查看代码，可能只需更改此基本行：

menuItems = topMenu.add($('.main-nav2')).find('a'),

在让它更具可读性之后我才能看到它：

var topMenu = $('.main-nav1'),
topMenuHeight = topMenu.outerHeight()+15,
menuItems = topMenu.add($('.main-nav2')).find('a'),

scrollItems = menuItems.map(function() {

    var item = $($(this).attr('href'));

    if (item.length) return item;
});

$(window).scroll(function() {

    var fromTop = $(this).scrollTop()+topMenuHeight,

    cur = scrollItems.map(function() {

        if ($(this).offset().top < fromTop)
        return this;
    });

    cur = cur[cur.length-1];
    var id = cur && cur.length ? cur[0].id : '';

    menuItems
    .parent().removeClass('active').end()
    .filter('[href=#'+id+']').parent().addClass('active');
});

滚动时需要自动菜单项的帮助

1 个答案: