Vue lets you apply a list of CSS classes by binding to an Array. To conditionally apply a CSS class at runtime, you can bind to a JavaScript object. In VueJS we can add or remove a DOM element using v-if: vue.js conditional rendering of an attribute. The directive v-if is used to conditionally render a block. The first property, page-item, has a value of true. Even we can use a template element to combine more elements together for a single condition. A pager in this case may look something like this: In this example, there are five pages. To refresh your memory, to bind a variable to a prop, class, or style, we use this syntax: If the value of className is blue-text, it will add the class .blue-text to the spanelement. width: 500px;"> The difference is that an element with v-show will always be rendered and remain in the DOM; v-show only toggles the display CSS property of the element.. Initially, we take a single button and we click on the button the text under the

tag is shown which is hid and similarly, if the text is hidden then it is changed to visible.

Those two properties are: pageItemClass and activeClass. There are situations where it’s beneficial to build different CSS files for the same web app. In this lesson, we'll learn the best practices of naming our Vue.js components. Assuming our Vue.js to be defined like this: He's also the founder of Ecofic, and creator of the Vue.js: Getting Started training course. The style of the item is conditionally set, based on the current page that’s being viewed. backgroundColor: 'green', Normally we shorten the binding syntax by removing v-bind, and we're left with just this: But this will always apply the value of className as a class to our spantag. In this tutorial we're going to use conditions to show or hide a div, for this example we're going to use a button to toggle whether to display the div or not. v-if is “real” conditional rendering because it ensures that event listeners and child components inside the conditional block are properly destroyed and re-created during toggles. . First, we will create a div element with id as app and let’s apply the v-else-if directive to an element with data. padding: '6px 14px',
display: true, inp: 39 Get practical advice to start your career in programming! The keys in this object should match the CSS style that we want to set, and the value should be an expression that resolves to a value. As you can probably guess, this is the CSS class that you want to apply conditionally.

The condition is true

m is smaller than 15

press Me } You can use either camelCase or kebab-case (use quotes with kebab-case) for the CSS property names: < div v-bind:style = "{ color: activeColor, fontSize: fontSize + 'px' }" > data: { activeColor: 'red', fontSize: 30} this.display = !this.display; The expression we’ll be using can be seen in the code associated with this article here. Headway Products Related Articles. Related Articles. Notably, these are the names of the two CSS classes discussed in Step 1. The if-condition is used in cases where the form element needs to show an error when the user has no input in … The block will only be rendered if the directive’s expression returns a truthy value. } A pager in this case may look something like this: In this example, there are five pages. 63. This hard-coded value is used because we always want to include the page-item class. First, we will create a div element with id as app and … Element displays normally when condition is true.When the condition is false, only partial compilation occurs and the element isn't rendered into the DOM until the condition becomes true.. v-else The second CSS class is the one that’s most relevant to this article, though. It is also possible to add an “else block” with v-else:

I’m going to show you how to use both approaches in the remainder of this article. Here let’s see how the If statement works in Vue.js. v-if. The difference between v-if and v-show is that v-if removes the HTML element from the DOM if the condition is false, and adds it back if the condition is true. el: '#input',

. This alternative approach expects two additional properties to exist in your Vue’s data object. That relevant code looks like this: I’ve reduced the amount of code by using Vue’s baked-in v-for directive. Imagine, for a moment, that the five page items shown in the image above were defined using the following HTML: Notice that each page in this code snippet has a list-item element (