jquery second click cancel event

When using jQuery to implement interactive pages, it is often necessary to bind click events to buttons or elements. In some scenarios, it is enough for the user to click once to trigger certain operations, while in other scenarios, the user needs to click again to cancel the execution of the operation. So how to use jQuery to bind a click event and implement the cancel function on the second click?

1. Using jQuery's click event

jQuery provides a click event to bind the click event of an element. For example:

$(".btn").click(function() {
  console.log("button clicked");
});

This code will bind the click event to the element with class "btn". When the element is clicked, "button clicked" will be output on the console.

2. Use the toggle function of jQuery

In order to realize the cancellation function on the second click, we can use the toggle function provided by jQuery. The toggle function switches execution between two callback functions. For example:

$(".btn").toggle(
  function() {
    console.log("button clicked");
  },
  function() {
    console.log("button clicked again");
  }
);

In this example, when the element with class "btn" is clicked for the first time, the first callback function will be executed and "button clicked" will be output; and when it is clicked for the second time , the second callback function will be executed and "button clicked again" will be output. This method is relatively simple, but it is only suitable for switching between two situations.

3. Use jQuery's on function

Compared with the limitations of the toggle function, we can use jQuery's on function to more flexibly implement the cancel function on the second click. The on function can bind multiple events to elements and bind event handling functions through event delegation. For example:

$(".btn").on("click", function() {
  if ($(this).attr("data-clicked") == "true") {
    console.log("button clicked again");
    $(this).attr("data-clicked", "false");
  } else {
    console.log("button clicked");
    $(this).attr("data-clicked", "true");
  }
});

In this example, we bind the click event to the element with class "btn", and add a custom attribute "data-clicked" to the element to determine whether the element is Clicked. When the element is clicked for the first time, "button clicked" is output and the "data-clicked" attribute is set to "true". When it is clicked for the second time, "button clicked again" is output and the attribute is set to "false". ". In this way, we can implement the cancel function on the second click.

Summary

Use jQuery to implement the second click cancellation function, which can be achieved through the toggle function or custom attributes and event delegation. It is necessary to choose an appropriate method according to the actual scenario in order to more conveniently control the user interaction of the page.

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