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Vue.js is a popular JavaScript framework that makes web application development easier and more efficient. In this tutorial, we will learn how to use Vue.js to display an element or text on mouse hover.

This tutorial will cover the following topics:

1. Binding events in Vue.js
2. Showing and hiding elements/text
3. Use vue directives to change element attributes
4. Use CSS to beautify our effects

Step 1: Bind events in Vue.js

First, we need to learn how to bind events in Vue.js so that we can trigger corresponding actions when the mouse hovers.

In Vue.js, we can v-onbind events through the directive. For example, when the mouse is hovering, we can use the following directive to hoverHandlerbind the function to mouseoverthe event:

<div v-on:mouseover="hoverHandler">Hover me!</div>

In the above code, we added a method called hoverHandler to the div element and v-on:mouseoverbound the method to the mouseover event using .

Step 2: Show and hide elements/text

Once we have defined hoverHandlerthe method and bound it to mouseoverthe event, we need to write some code to show or hide the element or text we want to manipulate.

We can define a Boolean show variable and then set it to true or false in the hoverHandler method to control the display and hiding of elements or text.

Here is a sample hoverHandler method implementation that displays a text string when the mouse hovers over an element:

data: {
    show: false
},
methods: {
    hoverHandler: function() {
        this.show = true;
    }
}

Here, we define the show variable in data and set it to true in the hoverHandler method.

Next, we need to bind the value of the show variable to the v-show attribute of an element or text. For example, in our example above, we can bind a div element to display a text string when the mouse hovers over it in the following way:

<div v-on:mouseover="hoverHandler" v-show="show">This is some text.</div>

Step 3: Use vue directives to change element attributes

In addition to using v-showthe attribute to show or hide elements, we can also use other Vue.js directives to change element attributes. For example, we can use v-bindto bind an element's class attribute to change its style when the mouse hovers.

Here is a sample implementation of the hoverHandler method that changes the background color of a div element when the mouse is hovering over it:

data: {
    bgClass: 'bg-blue'
},
methods: {
    hoverHandler: function() {
        this.bgClass = 'bg-red';
    }
}

In the above code, we defined the bgClass variable and changed it from 'bg-blue' to 'bg-red' in the hoverHandler method.

To bind bgClass to the class attribute of a div element, we can use the v-bind:class directive. For example:

<div v-on:mouseover="hoverHandler" v-bind:class="bgClass">Hover me!</div>

This will cause the div element to automatically change its class attribute when the value of bgClass changes.

Step 4: Use CSS to beautify our effect

Finally, we can use CSS to beautify our effect. For example, we can add some transition effects to the div element to make it have a smoother animation effect when it is displayed and hidden.

The following is a sample CSS style sheet implementation that makes a div element fade in and out when it is shown and hidden:

div {
    transition: opacity 0.5s;
}
div.ng-enter,
div.ng-leave {
    opacity: 0;
}

In the code above, we use transitionthe attribute to define the transition effect, and use the ng-enter and ng-leave classes to specify the start and end states of the animation.

After completing the above steps, we can create a complete mouseover effect, so that elements or text are displayed or hidden when the mouse is hovered, and have a transition effect when operating.

To sum up, this is a detailed tutorial on how to use Vue.js to display elements or text on mouse hover. By studying this tutorial, you will master the skills of binding events in Vue.js, showing and hiding elements/text, and using CSS to beautify our effects.