Ng style not updating
Notice that we could pass parameters to this method if needed. You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If we run into such an use case using Angular, we can implement it using the ngStyle built-in core directive: This is the resulting HTML: But more often than not, an element ends up having multiple state styles, and that is when the ngClass directive comes in handy! Angular ngClass and ngStyle: If the stylesheet you link to has the file extension of a preprocessor, we'll attempt to process it before applying. But another key feature of Angular that we have not covered yet, is the ability to isolate a component style so that it does not interfere with other elements on the page, and that is what we will be covering on part two of this series: Delegating to the component which styles should be applied One of the roles of the component class is to:
This syntax would give the same results as before, meaning that the two CSS classes btn and btn-primary would still be applied. Try the external resource search, it's quicker and gives you access to the most recent version of thousands of libraries. We use webpack to prepare them and make them available to import. So for these very common cases we won't need ngClass. About External Resources You can apply a script from anywhere on the web to your Pen. For instance -webkit- or -moz-. This could also have been an enum, or a calculation derived from the input data The method calculateClasses will now return a configuration object equivalent to the one we just saw above the CSS class btn-extra-class will be added or not to the HTML button depending on the value of the stateFlag variable But this time around the calculation of the configuration object is done in a component method, and the template becomes a bit more readable. But if for example start using longer expressions to calculate our boolean values, or have several state classes, this syntax could quickly become hard to read, overloading the template and putting too much logic in it. If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying. Notice the syntax [class. Component Styling using ngClass - when to use it and when to use other alternatives? This expression will add or not the class to the element depending on the truthiness of the expression, which in this case is always true. Let's then see what we can if we run into that case! But another key feature of Angular that we have not covered yet, is the ability to isolate a component style so that it does not interfere with other elements on the page, and that is what we will be covering on part two of this series: This is because this type of embedded styles takes precedence over any CSS styles except styles that are marked with! You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. These styles could for example include: Angular ngClass and ngStyle: Notice that the CSS classes don't have to be hard-coded in the template using this syntax its just an example , more on this later. We offer two popular choices: Note that many state styles can be natively implemented using browser CSS pseudo-classes, such as for example: Autoprefixer which processes your CSS server-side and -prefix-free which applies prefixes via a script, client-side. For example, the following expression contains an array of classes: For these cases, is ngClass needed? The ngClass directive will take an expression that will be used to determine which state styles to apply at a given time to the styled element. Let's then break down what is going on in this example: Summary There are a ton of options to style our components using ngClass and ngStyle, so it's important to know which one to use when and why.