javascript - 如何在Javascript中获取HTML控件的值字段？

Question

如何在Javascript中获取HTML控件的值字段？

我没有选择 Id ，而是尝试获取值 4875。

<input data-val="true" data-val-required="Required" id="ChangesInTreatYes" name="ChangesInTreat" type="radio" value="4875" />   Yes

<input id="ChangesInTreatNo" name="ChangesInTreat" type="radio" value="4876" />   No




if ($("input:radio[name='ChangesInTreat']:checked").length > 0) {
        var isChecked1 = document.getElementById("ChangesInTreatYes").checked;
alert(isChecked1);
}

Answer 1

jQuery 使事情变得简单——对于几乎所有表单元素，.val() 将返回元素的值。

let toggleEl = $("input[name='ChangesInTreat']")

toggleEl.on("change", function(){
  console.log($(this).val() );
})

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input data-val="true" data-val-required="Required" id="ChangesInTreatYes" name="ChangesInTreat" type="radio" value="4875" />   Yes

<input id="ChangesInTreatNo" name="ChangesInTreat" type="radio" value="4876" />   No

用普通的旧 JavaScript 做同样的事情:

let toggleEl = document.querySelectorAll("input[name='ChangesInTreat']")

// Go over each radio button, and add an event handler
toggleEl.forEach(function(element){
  element.addEventListener("change", function(){
    console.log(this.value)
  })
})

    <input data-val="true" data-val-required="Required" id="ChangesInTreatYes" name="ChangesInTreat" type="radio" value="4875" />   Yes

    <input id="ChangesInTreatNo" name="ChangesInTreat" type="radio" value="4876" />   No