jquery show hide effect

jQuery is a very popular JavaScript library that can be used to enhance the interactivity of websites. One of the common effects is to show and hide elements. The following will introduce in detail how to use jQuery to achieve this effect.

First of all, in HTML, there needs to be an element to hide or show, which can be any tag such as div, span, p, etc. For example, the following code creates two buttons and a div element:

<button id="show">显示</button>
<button id="hide">隐藏</button>

<div id="target">
  <p>这是要隐藏或显示的内容</p>
</div>

The id attribute is used to identify the element and is used in the subsequent JavaScript code.

Next, in JavaScript, you need to use the jQuery library to select elements and add event handlers for them. In this example, the div element needs to be shown or hidden when the button is clicked. The following is the code to achieve this effect:

$(document).ready(function() {
  $("#show").click(function() {
    $("#target").show();
  });
  $("#hide").click(function() {
    $("#target").hide();
  });
});

The above code is divided into two parts. First, in the $(document).ready function, two click event handlers are defined. $("#show")The button element with the id "show" is selected, $("#hide")The button element with the id "hide" is selected. These selectors return jQuery objects whose methods can be called to add event handlers.

Secondly, when the button is clicked, the corresponding handler is triggered. $("#target")The div element with the id "target" is selected and its show() method or hide() method is called to show or hide the element.

Note that the $ symbol is used here. This is because the jQuery library defines a $ symbol in the global scope. You can use this notation instead of jQuery and shorten your code. For example, $("#target") is equivalent to jQuery("#target").

In addition, the show() and hide() methods accept some optional parameters to control the display or hiding method. For example, you can use $("#target").show("slow") to make the display have a slow animation effect. Similarly, you can use $("#target").hide(1000) to make the hide animation last for 1 second.

In addition to the show() and hide() methods, jQuery also provides other methods to control the visibility of elements. For example, the fadeIn() method and fadeOut() method make elements fade in and out. The slideDown() and slideUp() methods can make elements slide down and collapse. When using these methods, you can use the same parameters as the show() and hide() methods to control the animation effect.

Finally, if you want to switch between the display states of an element, you can use the toggleClass() method. For example, the following code creates a toggle button that, when clicked, either shows or hides a div element:

<button id="toggle">切换</button>

<div id="target">
  <p>这是要隐藏或显示的内容</p>
</div>

The JavaScript code is as follows:

$(document).ready(function() {
  $("#toggle").click(function() {
    $("#target").toggleClass("hidden");
  });
});

A CSS class hidden is used here to Control the display and hiding of elements. When a div element has this class, it will be hidden. And when there is no such class, it will be displayed. The toggleClas method switches between the two states of an element.

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