How to determine whether an element is hidden or displayed in jquery

Preface

In web development, we often need to switch the display or hiding of an element according to the user's operation. At this time, you need to use some APIs in jQuery to achieve it. This article will introduce how to use jQuery to determine the hidden and displayed status of elements, and how to switch their status.

1. Determine whether the element is hidden

We can use the .is(":hidden") method to determine whether the element is hidden. The sample code is as follows:

if ($("#test").is(":hidden")) {
  console.log("The element is hidden.");
} else {
  console.log("The element is visible.");
}

In the above code, we first find the element with the ID test, and then use the .is(":hidden") method to determine whether it is hidden. If the element is hidden, print The element is hidden.; otherwise print The element is visible..

2. Determine whether the element is displayed

To determine whether the element is displayed, we can use the .is(":visible") method. The sample code is as follows:

if ($("#test").is(":visible")) {
  console.log("The element is visible.");
} else {
  console.log("The element is hidden.");
}

In the above code, we still find the element with the ID test, and then use the .is(":visible") method to determine whether it is displayed. If the element is displayed, print The element is visible.; otherwise print The element is hidden..

3. Switch the display/hide state of the element

If we want to switch the display/hide state of the element, we can use the .toggle() method. This method will automatically determine the state of the element. If the element is currently hidden, it will be displayed; vice versa. The sample code is as follows:

$("#test").toggle();

In the above code, we first find the element with the ID test, and then use the .toggle() method to switch its display/hidden state.

It should be noted that when the .toggle() method does not pass parameters, it only switches the display/hidden state of the element; if a parameter is passed, then this method will switch the display/hide state of the element according to the value of the parameter. . For example:

$("#test").toggle(true);

In the above code, we set the parameter to true, which means to set the display state of the element to display. If the element is already displayed, this method will have no effect.

4. Show/hide elements

If we want to show/hide elements directly instead of switching their states, we can use the .show() and .hide() methods.

.show() method can display the element. The sample code is as follows:

$("#test").show();

In the above code, we set the display status of the element to display.

.hide() method can hide elements. The sample code is as follows:

$("#test").hide();

In the above code, we set the display state of the element to hidden.

It should be noted that the .show() and .hide() methods have some optional parameters that can be used to control the speed and method of animation effects. For information on how to use these parameters, please refer to the jQuery official documentation.

5. Summary

Through the introduction of this article, we have learned how to use jQuery to determine the display/hidden state of elements, and how to switch their states. In actual development, we can implement many interesting functions based on these APIs, such as switching the display/hidden state of an element when the user clicks a button, or changing the display content of an element in real time based on user input, etc. wait.

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