What's the best way to "extend" a Vue component, i. Doing this could save you from duplicating code, making your components quicker to develop and easier to maintain. There are a number of APIs and patterns that Vue offers for this, installing v4l2src you'll need to choose the right one depending both on your goals and personal taste. In this article, I'll give you an overview of the different options to help you choose the best and most suitable for your scenario.
Keep in mind that all methods of extending components can add complexity and verbosity to your code, and in some cases, additional performance overhead. So before you decide to extend a component, it's a good idea to first check if there are simpler design patterns that can achieve what you want. The following component design patterns can often be sufficient substitutes for extending a component:.
The easiest way to make a component multi-use, and thus avoid extending it, is to provide a prop which drives conditional logic in the template. In the following example, we use a prop type for this purpose. A parent can then declare this component and use the prop to get the variation required.
Here are two indicators that you've either hit the limits of this pattern or are misusing it:. Another way to make a component versatile without extending it is to allow the parent component to set custom content within the child using slots. A potential limitation of this pattern is that the elements in the slot belong to the parent's context, which may not be a natural way of dividing your logic and state. Scoped slots can bring more flexibility, and we'll explore these more in the section on renderless components.
Each of these has its pros and cons and will be more or less suitable depending on the situation in which you want to use them. The state-of-the-art way to share state and logic between components is the Composition API. Rather than defining your component with properties on the component definition object e. For example, here's how you might declare a simple Counter component with classic Vue 2 option properties:.
Now, here's the same component refactored to use the Composition API. Note that the functionality is unchanged. One of the main benefits of declaring a component using the Composition API is that it makes logic reuse and extraction very easy.
Learn and master what professionals know about building, testing, and deploying, full-stack Vue apps in our latest course. If you're using Vue 2 or simply prefer to organize your component features by option, you can use the mixin pattern.Select your desired component from below and see the available props, slots, events and functions. Appends an icon to the outside the component's input, uses same syntax as v-icon.
Applies specified color to the control - it can be the name of material color for example success or purple or css color or rgba0, 0, 0. You can find list of built in classes on the colors page. Creates counter for input length; if no number is specified, it defaults to Does not apply any validation.
Applies the dark theme variant to the component. This will default the components color to white unless you've configured your application theme to dark or if you are using the color prop on the component. You can find more information on the Material Design documentation for dark themes. Puts the input in an error state and passes through custom error messages. Will be combined with any validations that occur from the rules prop.
This field will not trigger validation. Removes elevation shadow added to element when using the solo or solo-inverted props. Hides hint and validation errors.
When set to auto messages will be rendered only if there's a message hint, error message, counter value etc to display. Displays linear progress bar. Can either be a String which specifies which color is applied to the progress bar any material color or theme color - primarysecondarysuccessinfowarningerror or a Boolean which uses the component color set by color prop - if it's supported by the component or the primary color.
Round if outlined and increase border-radius if filled. Must be used with either outlined or filled. Slot for custom progress linear displayed when loading prop is not equal to Boolean False.
The append-icon and prepend-icon props help add context to v-textarea. When using the auto-grow prop, textarea's will automatically increase in size when the contained text exceeds its size. The background-color and color props give you more control over styling v-textarea 's.
The autocomplete prop gives you the option to enable the browser to predict user input. You can clear the text from a v-textarea by using the clearable prop, and customize the icon used with the clearable-icon prop.
The counter prop informs the user of a character limit for the v-textarea. The rows prop allows you to define how many rows the textarea has, when combined with the row-height prop you can further customize your rows by defining their height. Utilizing alternative input styles, you can create amazing interfaces that are easy to build and easy to use.
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If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. If the prop is enabled, the component is oriented only to the specified.
Define the initial width of the parent element. If not specified it calculated automatically. With this parameter, you can set the bounding area for the component, and also it is used when resizing in real time. Define the initial height of the parent element. Define the initial horizontal scale or the parent element. Same value in parent's transform: scale css definition. Define the initial vertical scale or the parent element.
Define the grid step size for the horizontal axis. Both sides of the component left and right will snap to this step. Define the grid step size for the vertical axis. Both sides of the component top and bottom will snap to this step. Type: Array Required: false Default: ['tl', 'tm', 'tr', 'mr', 'br', 'bm', 'bl', 'ml']. Define the axis on which the element is draggable. Available values are xyboth or none. Skip to content.
In each of my components, I have elements that has variables that should change on scroll and resize such as sidebarWidth or overlayItemWidth. I found this post here that shows this way of adding a listener for scroll and resize.
I wont show the contents of the methods calculateScrollcalculateViewportIn my components I have variables that should change and reevaluate on scroll and on resize as well. But every time I have such a variable, then I currently add those same listeners in created and destroyedand then add the same event-listeners to the given component, and then do the calculations from a new method in there.
It seems long and clumbsy. Are there a way that I can get around having those window. AddEventListener s in each component, but only have those in my root instance? I was thinking, if I had an array of 'things-that-need-to-be-recalculated-on-scroll-or-resize' in my main instance, but I'm not sure if it would get cluttered, since the variables for the components then actually wouldn't be kept in the component, but instead be referenced with this. And this would also make my main instance massive.
You should be making a custom component that can accept as props the things that change and that does all the operations needed such as adding and removing event listeners.Image Upload & Crop - Laravel + Vuejs - Image preview Before Upload #4
No answers at all, - so I dived down into it myself. This is the best I could come up with. I hope it helps others in the need of the same. I was torn between using extends source or mixins source. After a bit of research, I ended up using mixins this video hit the nail on the head regarding what I was trying to achieve and how to solve it. If you want to make the mixin global, for all components, then look at this video around and onwards. I'm not doing that in below-written explanation.
Please note, that I'm using webpack alongside laravel-mix with below-written solution. It's used in a WordPress-installation. This is a mix of a bazillion different answers and articles. It would take forever to credit it all to the correct owners and sources, so I'm not even gonna try. It's called Reactivator and this is how you'd create a global handler for window.
That said, watching viewport size is such a common case that I have put it and other useful things like scroll position or mouse position in an extra package of common Reactivator implementations. You can find it on npm as vue-browser-state.If you are looking for the version 1 of the component, it is available on the v1 branch. For examples of the component go to the live playground.
Used to set the custom class of a draggable-resizable component when draggable is enable. Used to set the custom class of a draggable-resizable component when resizable is enable. Used to set the custom common class of each handle element. By default, the component adds the style declaration 'user-select:none' to itself to prevent text selection during drag.
You can disable this behaviour by setting this prop to false. By default, the browser's native drag and drop funcionality usually used for images and some other elements is disabled, as it may conflict with the one provided by the component.
If you need, for whatever reason, to have this functionality back you can set this prop to true.
Determines if the component should be active or not. The prop reacts to changes and also can be used with the sync modifier to keep the state in sync with the parent. You can use along with the preventDeactivation prop in order to fully control the active behavior from outside the component.
Type: Array Required: false Default: ['tl', 'tm', 'tr', 'mr', 'br', 'bm', 'bl', 'ml']. Define the axis on which the element is draggable. Available values are xy or both. The lockAspectRatio property is used to lock aspect ratio. This property doesn't play well with gridso make sure to use only one at a time. Called when dragging starts element is clicked or touched. If false is returned by any handler, the action will cancel. You can use this function to prevent bubbling of events.
Called when resizing starts handle is clicked or touched. You can style the component using appropriate class names passed as props to the component.
Moreover you can replace the default styles for the handles, provided in the source file vue-draggable-resizable.
The default classes for handles are handle and handle-tlhandle-br and so on. The component also provides named slots for each handle, so you can use your markup inside each one. Thanks to kirillmurashov for his work on vue-drag-resize component. If you discover any security related issues, please email maurizio. Vue2 Component for resizable and draggable elements.
Last updated 4 months ago by mauricius. VueDraggableResizable 2 Vue2 Component for draggable and resizable elements. I'm a flexible component. You can drag me around and you can resize me. Thanks Thanks to kirillmurashov for his work on vue-drag-resize component.Heavily inspired by React-Grid-Layout. Include the browser-ready bundle download from releases in your page. The components will be automatically available.
The value must be an Array of Object items. Each item must have ixyw and h properties.
Please refer to the documentation for GridItem below for more information. The value must be a two-element Array of Number. Each value is expressed in pixels.
The first element is a margin horizontally, the second element is a vertical margin. Says if the CSS transition-property: transform; should be used. The value is a number that is multiplied by colWidth. The value is a number that is multiplied by rowHeight. Says what is a minimal width of the item. If w will be smaller then minW then w will be set to minW. Says what is a minimal hieght of the item. If h will be smaller then minH then h will be set to minH.
Says what is a maximal width of the item. If w will be bigger then maxW then w will be set to maxW. Says what is a maximal height of the item. If h will be bigger then maxH then h will be set to maxH. For more info please refer to ignoreFrom in interact. If null then one can drag by any excluding dragIgnoreFrom element of the item.
For more info please refer to allowFrom in interact. Move and resize event listeners can be added to each grid-item, so that the parent Vue can be notified when a grid element is being moved or resized.
Moved and resized event listeners can be added, if the only notification needed is when an item is finished moving or resizing. Working example here. Heavily inspired by React-Grid-Layout Current version: 2. Create a PR to let me know! Features Draggable widgets Resizable widgets Static widgets Bounds checking for dragging and resizing Widgets may be added or removed without rebuilding grid Layout can be serialized and restored Automatic RTL support resizing not working with RTL on 2.
To address this problem, Vue provides event modifiers for v-on.
Vue Bootstrap Resize - Bootstrap 4 & Material Design
Recall that modifiers are directive postfixes denoted by a dot. Order matters when using modifiers because the relevant code is generated in the same order. Therefore using v-on:click. Unlike the other modifiers, which are exclusive to native DOM events, the. Vue also offers the.
When listening for keyboard events, we often need to check for specific keys. Vue allows adding key modifiers for v-on when listening for key events:. You can directly use any valid key names exposed via KeyboardEvent.
The use of keyCode events is deprecated and may not be supported in new browsers. Vue provides aliases for the most commonly used key codes when necessary for legacy browser support:. A few keys. You can also define custom key modifier aliases via the global config.
You can use the following modifiers to trigger mouse or keyboard event listeners only when the corresponding modifier key is pressed:. Note that modifier keys are different from regular keys and when used with keyup events, they have to be pressed when the event is emitted. In other words, keyup. If you do want such behaviour, use the keyCode for ctrl instead: keyup. In fact, there are several benefits in using v-on :.
This makes it easier to test. When a ViewModel is destroyed, all event listeners are automatically removed. Stay at home and level up. Special Sponsor.