如何解决在 JavaScript 中获取按钮的值
我在尝试获取按钮的值时遇到问题。目前它将调用我单击的按钮,但表示该值未定义。我尝试使用 this 并尝试使用 JQuery 的 val()。如果可能的话,我希望答案是普通的 JavaScript。
相关代码如下。
var grabButton = document.querySelectorAll("button");
function checkLetter()
{
// Pull the value of the button and declare it as letter
letter = this.grabButton.value;
console.log(letter);
}
grabButton.forEach(button => {
button.addEventListener("click",function() { checkLetter() });
});
<div id="letters">
<button class="letter" value="A">A</button>
<button class="letter" value="B">B</button>
<button class="letter" value="C">C</button>
<button class="letter" value="D">D</button>
<button class="letter" value="E">E</button>
<button class="letter" value="F">F</button>
<button class="letter" value="G">G</button>
<button class="letter" value="H">H</button>
<button class="letter" value="I">I</button>
<button class="letter" value="J">J</button>
<button class="letter" value="K">K</button>
<button class="letter" value="L">L</button>
<button class="letter" value="M">M</button>
<button class="letter" value="N">N</button>
<button class="letter" value="O">O</button>
<button class="letter" value="P">P</button>
<button class="letter" value="Q">Q</button>
<button class="letter" value="R">R</button>
<button class="letter" value="S">S</button>
<button class="letter" value="T">T</button>
<button class="letter" value="U">U</button>
<button class="letter" value="V">V</button>
<button class="letter" value="W">W</button>
<button class="letter" value="X">X</button>
<button class="letter" value="Y">Y</button>
<button class="letter" value="Z">Z</button>
</div>
解决方法
const grabButton = document.querySelectorAll("button");
function checkLetter() {
const letter = this.value;
console.log(letter);
}
grabButton.forEach(button => button.addEventListener("click",checkLetter));
<div id="letters">
<button class="letter" value="A">A</button>
<button class="letter" value="B">B</button>
<button class="letter" value="C">C</button>
<button class="letter" value="D">D</button>
<button class="letter" value="E">E</button>
<button class="letter" value="F">F</button>
<button class="letter" value="G">G</button>
<button class="letter" value="H">H</button>
<button class="letter" value="I">I</button>
<button class="letter" value="J">J</button>
<button class="letter" value="K">K</button>
<button class="letter" value="L">L</button>
<button class="letter" value="M">M</button>
<button class="letter" value="N">N</button>
<button class="letter" value="O">O</button>
<button class="letter" value="P">P</button>
<button class="letter" value="Q">Q</button>
<button class="letter" value="R">R</button>
<button class="letter" value="S">S</button>
<button class="letter" value="T">T</button>
<button class="letter" value="U">U</button>
<button class="letter" value="V">V</button>
<button class="letter" value="W">W</button>
<button class="letter" value="X">X</button>
<button class="letter" value="Y">Y</button>
<button class="letter" value="Z">Z</button>
</div>
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