How to capture any keypress event in Vuejs without using input element

问题

I am making kind of game in which I want user to enter a particular word and then I want to check if the particular word is pressed. If the word is pressed I will fetch the next word. Currently I am using a form and have used v-model shown below :

 <input v-model="inputSpell">

In the Vue instance I have used the watch property which constantly checks the if the input word matches the asked word.

watch : {

    inputSpell : function() {
        var spellCount = this.spellCount;
        var inputSpell = this.inputSpell.toUpperCase();
        var presentSpell = this.presentSpell;

        console.log("Spell Count " + spellCount);
        console.log("Input Spell " + inputSpell);
        console.log("Present Spell" + presentSpell);

        if (inputSpell.length === 3 && inputSpell === presentSpell) {
            this.$set(this, 'inputSpell', '');
            if (spellCount === 3) {
                return this.completeCombo();
            }
            return this.fetchSpell(spellCount);
        }

        if (inputSpell.length >=3) {
            this.$set(this, 'inputSpell', '');
        }
    }
}

There are three ideas I thought of :

1. Above way what I am doing is showing the form. The user enters for word in that form. Does not look good.

2. Make the input element hidden and focus on it when the game loads. But the disadvantage is if the user click anywhere on the page the focus on the form will be lost.

3. Making a custom directive or calling a method which captures the keypress event to check for words.

Any help will be appreciated.

Thanks.

回答1:

To capture a key press without using an input, you could just include a standard event listener inside your lifecycle hook ("mounted", for instance) like so:

mounted() {

    let self = this; 

    window.addEventListener('keyup', function(ev) {
        self.myMethod(ev); // declared in your component methods
    });
}

来源：https://stackoverflow.com/questions/40283406/how-to-capture-any-keypress-event-in-vuejs-without-using-input-element