如何使用jQuery切换JavaScript功能

Question

I have two javascript functions

 function A(){ 
   alert("A() function is called");
 }

function B(){
    alert("B() function is called");
 }

 $("#button").click(function(){
 // I need to toggle A() and B() here
 });

How can I achieve this, can any one please help on this?

Answer 1

To achieve this you could store a flag which stores the state of the element, and therefore which function to call. Here's an example which uses a class:

$("#button").click(function(){
    var $el = $(this).toggleClass('foo');
    $el.hasClass('foo') ? A() : B();
});

You could bind/unbind event handlers on each successive click, but this quickly becomes unwieldy and a pain to maintain.

For the sake of completeness, here's an example that uses a data attribute instead:

$("#button").click(function(){
    var $el = $(this).data('foo', !$(this).data('foo'));
    $el.data('foo') ? A() : B();
});

Answer 2

you could change the binding

function A(){ 
   alert("A() function is called");
   $("#button").off("click", A).on("click", B);
 }

function B(){
   alert("A() function is called");
   $("#button").off("click", B).on("click", A);
 }

 $("#button").on("click", A);

Answer 3

You could use a boolean variable (true) and set it to false after calling the first fonction. Then if false call the second one and set the boolean variable again (to true).

Answer 4

Use .data() to set a variable on the element itself, which tells you which function to call.

 function A() { alert("A() function is called"); } function B() { alert("B() function is called"); } $("#button").click(function() { if ($(this).data('AorB') == 'B') { B(); $(this).data('AorB', 'A'); } else { A(); $(this).data('AorB', 'B'); }; }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <button id="button">click me</button> 

Answer 5

you can do by applying class to the button and write depends on class

Live Demo

 <input type="button" class="callA" value="click me" id="button" />

 $("#button").click(function(){

   if($(this).hasClass('callA')){
           A();
    }
   else
    {
          B();
    }
 });