Tab active state in JQuery Mobile

问题

Say we have 2 tabs using data-role="navbar", and we switch to the second tab and then go to another new page. When we return back from the previous page, why is the tab that we selected second tab is not the one which is active. It shows the first tab as only active. Is jquery mobile not handling this.

回答1:

Description :

Unfortunately jQuery Mobile don't handle this correctly so we need to do it. Basically you need to remove href from navbar li element. Page change will be handled manually. What we are doing here is binding a click event to navbar li element. When user clicks on navbar it will remove ui-btn-activ and ui-state-persist class from currently selected element. It will the add it to currently selected element and initialize a pageChange after a small timeout. Timeout is needed because we need to be sure class is added before page change can occur.

Solution :

Here's a working example I made some time ago: http://jsfiddle.net/Gajotres/6h7gn/

Code:

This code is made for my current example and its navbar so change it slightly to work with your navbar.

$(document).on('pagebeforeshow', '#index', function(){ 
    $(document).on('click', '#kml li', function(){ 
        var selectedLi = $(this);
        $('#kml li').each(function( index ) {   
            var loopLi = $(this);
            if(loopLi.find('a').hasClass('ui-btn-active')) {  
                $(this).find('a').removeClass('ui-btn-activ').removeClass('ui-state-persist');
            }
        });         
       selectedLi.find('a').addClass('ui-state-persist');        
       setTimeout(function(){
            $.mobile.changePage( "#second", { transition: "slide"});
        },100);
    });       
});

Edit :

Next version example: http://jsfiddle.net/Gajotres/6h7gn/

This one works on every page.

$(document).on('pagebeforeshow', '#index', function(){ 
    $(document).off('click', '#custom-navbar li').on('click', '#custom-navbar li', function(e){ 
        var selectedLi = $(this);
        $('#custom-navbar li').each(function( index ) {   
            var loopLi = $(this);
            if(loopLi.find('a').hasClass('ui-btn-active') || loopLi.find('a').hasClass('ui-state-persist')) { 
                loopLi.find('a').removeClass('ui-btn-activ').removeClass('ui-state-persist');
            }
            if(loopLi.attr('id') == selectedLi.attr('id')) {
                loopLi.find('a').addClass('ui-state-persist');   
            }
        });              
       setTimeout(function(){
            $.mobile.changePage( selectedLi.find('a').attr('data-href'), { transition: "slide"});
        },100);
    });       
});

回答2:

Here is my short solution. It works perfect for me

Sample HTML structure

<div id="profile-screen" data-role="page" class="page">
    <div data-role="content" class="content inner-page group">
        <div data-role="tabs">
            <div data-role="navbar">
                <ul>
                    <li><a href="#tab-profile" class="ui-btn-active">Profile</a></li>
                    <li><a href="#tab-addresses">Addresses</a></li>
                </ul>
            </div>

            <!-- Profile tab -->
            <div id="tab-profile" class="main-content"> Sample Content for the first tab</div>

            <!-- Addresses tab -->
            <div id="tab-addresses" class="main-content"> Sample Content for the second tab</div>
        </div>
    </div>
</div>

And this is the solution

$( "#profile-screen" ).on( "pagebeforeshow", function() {
    var active_content = $('#profile-screen .ui-tabs-panel[style*="block"]').attr('id');
    $('#profile-screen a[href^="#'+ active_content +'"]').addClass('ui-btn-active');
});

First you have to find the active content. The typical for the active content is that it has style="display:block". When you you find it, you have to get the id ( it is var active_content in my code ). When you know which content is active all that you have to do is to find the correct anchor tag and to set class ui-btn-active. And all these things you have to type in pagebeforeshow event.

回答3:

I know this is old but no need for all this.

I had this problem too and all you need is few lines to fix it. In my case it was in a tabs so didn't need to change page.

$(document).on( "pageinit", "#yourpageID", function() {
    $('div[data-role="tabs"] [data-role="navbar"] a').click( function(e) {
        e.preventDefault();
        $('div[data-role="tabs"] [data-role="navbar"] .ui-btn-active').removeClass('ui-btn-active ui-state-persist');
        $(this).addClass('ui-btn-active ui-state-persist');
    });
});

Also be careful using page events like pagebeforeshow to bind events in JQM, the previous(or more) page may be in the cache and if you go back and forth the click event will be binded multiple times. Instead use pageinit or .one to bind events

来源：https://stackoverflow.com/questions/16752704/tab-active-state-in-jquery-mobile