我有一堆输入字段,其中使用for循环和类名附加了事件侦听器。有没有办法可以获取触发的输入字段的ID? 我有大约40个输入字段,我想从触发的输入中获取id,并将其作为变量传递给函数。
HTML -
<input type="text" id="t11Text1" class="text1 input">
<input type="text2" id="t11Text2" class="text2 input">
<input type="text" id="t12Text1" class="text1 input">
<input type="text2" id="t12Text2" class="text2 input">
JS -
var onChange = document.querySelectorAll('.input');
var onChangeSelect = document.querySelectorAll('.select');
for (var i = 0; i < onChange.length; i++) {
onChange[i].addEventListener("input", function() {
myFunction();
});
}
答案 0 :(得分:9)
您可以访问匿名函数中的event
object,foreach($_POST['chk'] as $key => $value) { ... }
将是元素的event.target.id
。
id
答案 1 :(得分:2)
虽然@Josh Crozier的回答是正确的,并且恰好回答了这个问题,但我会避免设置这么多听众并做这样的事情:
HTML:
<form class="myformclass">
<input type="text" id="t11Text1" class="text1 input">
<input type="text2" id="t11Text2" class="text2 input">
<input type="text" id="t12Text1" class="text1 input">
<input type="text2" id="t12Text2" class="text2 input">
<select class="input">
<option value="0">0</option>
<option value="1">1</option>
</select>
</form>
JS:
var myForm = document.querySelector('.myformclass');
myForm.addEventListener("input", function getInput(e) {
var input = e.target;
if (input.classList.contains("input")) {
doWhateverWithTheInput(input);
}
});
function doWhateverWithTheInput(elt) {
console.log(elt);
}
答案 2 :(得分:1)
在事件侦听器回调函数中,您会收到一个事件对象,该事件对象填充了触发事件的元素on event.target
请看下面的示例:
var inputs = document.querySelectorAll('[id*=input]');
// in this case works also with `document.getElementsByTagName('input')`
var selects = document.querySelectorAll('[id*=select]');
// the definition of the event listener
var inputEventListener = function(event) {
console.log(event.target.id);
//event.target.style.background = '#FDFDFD';
//event.target - is the actual element;
}
for (var i = 0, length = inputs.length; i < length; i++) {
// here is added the event listener for the input elements
inputs[i].addEventListener('input', inputEventListener);
}
for (var i = 0, length = selects.length; i < length; i++) {
// here is added the event listener for the select elements
selects[i].addEventListener('change', inputEventListener);
}
<!-- Ignore this, I'm too lazy to write 100 inputs -->
<!-- Adding 100 inputs to the page so we can run some test on them -->
<script>
for (var i = 0; i < 100; i++) {
document.write('<label for="input' + i + '">Input ' + i + '</label> <input id="input' + i + '"/><select id="select' + i + '"><option>1</option><option>2</option><option>3</option></select><br />');
}
</script>