如何检测“输入"按键试剂? [英] How To Detect "Enter" Keypress in Reagent?

问题描述

给出以下代码:

  [:input {:type "text"
           :value (:text @app-state)
           :on-change (fn [e]
                        (if (= 31 (.-keyCode e))
                          (println "ENTER")
                          (println "NOT ENTER")))}]

如何更改if条件，以便区分输入的按键和普通的按键?除了target之外，e中的所有属性似乎都为空.

How to change the if condition so that enter keypresses can be distinguished from normal keys? All properties in e except target seem to be null.

推荐答案

这是解决方法:

1. 您应该听:on-key-press(而不是:on-change)， 因为输入"不会触发:on-change事件(显然不会更改文本)
2. 输入"的键码是 13 ，而不是 31

3. 使用charCode代替keyCode(不是js专家，但是keyCode在firefox中对我不起作用)

1. you should listen to :on-key-press (rather than :on-change), because "enter" doesn't trigger :on-change event (it obviously doesn't change the text)
2. key code for "enter" is 13, not 31

3. use charCode instead of keyCode (not an expert in js, but keyCode doesn't work for me in firefox)

[:input {:type "text"
         :value (:text @app-state)
         :on-key-press (fn [e]
                         (println "key press" (.-charCode e))
                         (if (= 13 (.-charCode e))
                           (println "ENTER")
                           (println "NOT ENTER")))}]

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