Reasons and solutions for uniapp PC scroll wheel failure

Uniapp is a framework that supports cross-platform development and can be used to develop mobile and PC applications. Among them, PC-side applications usually involve scroll wheel operations. However, in uniapp, the problem of scroll wheel failure sometimes occurs, which brings a lot of trouble to developers. This article will introduce the reasons and solutions for uniapp PC scroll wheel failure.

1. Cause analysis

1. The event listener is not bound correctly

In uniapp, processing mouse wheel events requires binding a listener. If the listener is not bound correctly, the scroll wheel event will fail. In uniapp, you can use the following code to bind a listener:

mounted() { document.addEventListener('mousewheel', this.handleMouseWheel) }, methods: { handleMouseWheel(event) { console.log(event) } }

2. The wheel event is captured by other elements

When there are multiple elements in the page, the wheel event may be captured by other elements , resulting in the failure to trigger the scroll wheel event on this element. For example, when the mouse scrolls over an element that has a scroll bar, that element captures scroll wheel events but not other elements on the page.

3. Scroll bar style issue

In PC applications, the scroll bar style is usually customized. If there is a problem with the style of the scroll bar, such as being too small or invisible, it may cause the scroll wheel event to fail.

2. Solution

1. Correctly bind the listener

In uniapp, the correct binding of the listener can be done by binding the listener in the mounted life cycle function to fulfill. As follows:

mounted() { document.addEventListener('mousewheel', this.handleMouseWheel) }, methods: { handleMouseWheel(event) { console.log(event) } }, beforeDestroy() { document.removeEventListener('mousewheel', this.handleMouseWheel) }

Among them, the beforeDestroy life cycle function is used to unbind the listener before the component is destroyed.

2. Clarify the triggering element of the scroll wheel event

In order to ensure that the scroll wheel event is triggered on the required element, it is necessary to clarify the triggering element of the scroll wheel event. This can be achieved through the following code:

mounted() { this.$refs.scrollContainer.addEventListener('mousewheel', this.handleMouseWheel) }, methods: { handleMouseWheel(event) { console.log(event) } }

Among them, $refs can get the reference of the element in the template, and you can get the element that triggers the scroll wheel event through this attribute and bind the listener.

3. Adjust the scroll bar style

Adjusting the scroll bar style can be achieved by modifying the CSS style, for example:

.my-scrollbar::-webkit-scrollbar { width: 10px; height: 10px; } .my-scrollbar::-webkit-scrollbar-thumb { border-radius: 5px; background-color: #ccc; }

Among them, .my-scrollbar indicates that a custom style is required elements, -webkit-scrollbar and -webkit-scrollbar-thumb are pseudo-elements used to define scroll bar styles.

In short, solving the problem of uniapp PC scroll wheel failure requires an in-depth understanding of the triggering mechanism of scroll wheel events and the structure and style of page elements, and by correctly binding listeners, clarifying the trigger elements of scroll wheel events and adjusting scroll bar styles Wait for ways to solve the problem.

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