In order to prevent the default action of the form, we can use the event modifier prevent. We can remove the events from the button and the input field, since the form will be taking care of those. On our form, let's add v-on:submit="add Dinos." Let's add v-on:keyup.enter, and set it equal to "addDinos." Let's make this more accessible by wrapping these elements in a form element. We want to make it so that the user can just press enter from the input field, to add that amount of Dinosaurs. Let's change our button text to reflect the amount of Dinosaurs being added. Now, we can type a number into the input field, and click the button to add that amount to our total. Let's change our click event on the button to "addDinos". We'll add an input field of type="number" and set v-model to the "amount" attribute on our component. Let's add v-on:click, and set that ="total += 1." Now, when we click the Add Dinosaur button, our total is incremented by one. To retrieve the code of a key, you can go to the site "".Here we have a button. You can also make key combinations with the keys: ".ctrl", "alt", ".shift" and ".meta" (Windows key, apple, cmd, call it as you like )).Įxample of combination with these keys, if I do "control" + "a" (code: 65):Īnd they can be chained together. Some code have an alias, for the "enter" key I will do this: įor example, if I want to run my callMethod method when I press the "1" key (code 49) in the text field I will do this: Also, we can shorten this slightly by using instead of v-on. We set its value to the onEnter method to run it when we focused on the input and press enter. when the user is typing (this is a Vue issue with v-model on custom components). We add the v-on:keyup directive with the enter modifier to let us watch for enter key presses. ), they can only be used on key-specific events (keyup, keydown.These instructions will be used as modified events, but instead of following the standard javascript events (onclick etc. When you want to capture the keyboard keys that have been typed by the user, VueJS provides specific instructions called "key modifiers". once ensure that the event is launched only once.Įvent modifiers can be combined when they are written to the string. self does not start the function on this element unless the event is indeed on this element and not on one of the elements "son" capture captures the events that would occur in the "child" elements prevent prevents the submit event from reloading the page submit, click, keydown, keyup, etc.). Just put one of the following keywords after the name of the event in your v-on statement: A form could be submitted by a user pressing enter on their keyboard. To avoid this work, and to simplify your code, VueJS has planned what is called an "event modifier" for the v-on function. Often when you want to do a processing following an event, you call a javascript method like event.preventDefault() for example. The callMethod function will get the "title" and display in by putting "Hello: " at the start. You can also do it with the "change" event, to launch the function each time the text in the input field change:Īnd with the "keyup" event, you can trigger the function each time you use your keyboard on the selected element: You can see here v-on:click="callMethod" it allows us to tell VueJS "on this input element,for each "click" event,you will launch the "callmMethod" function. When an event is triggered on a DOM element, then the associated function will be unlinked.įor exemple, the following code (/src/App.vue): In order to observe certain events under VueJS, the "v-on" function can be used. As for the lessons before, we start from the code of the previous tutorial.Įvents allow you to trigger a particular process when an action happens during an event (a click in an area, a mouse over a zone, when you press a key). We now meet to talk about the events with VueJS.
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