纯 Javascript 监听输入值变化
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Pure Javascript listen to input value change
提问by gespinha
Is there any way I can create a constant function that listens to an input, so when that input value changes, something is triggered immediately?
有什么办法可以创建一个监听输入的常量函数,所以当输入值发生变化时,会立即触发某些东西吗?
I am looking for something using pure javascript, no plugins, no frameworks and I can't edit the HTML.
我正在寻找使用纯 JavaScript 的东西,没有插件,没有框架,而且我无法编辑 HTML。
Something, for example:
某事,例如:
When I change the value in the input MyObject, this function runs.
当我更改 input 中的值时MyObject,此函数将运行。
Any help?
有什么帮助吗?
回答by Quentin
回答by Niffler
As a basic example...
作为一个基本的例子......
HTML:
HTML:
<input type="text" name="Thing" value="" />
Script:
脚本:
/* event listener */
document.getElementsByName("Thing")[0].addEventListener('change', doThing);
/* function */
function doThing(){
alert('Horray! Someone wrote "' + this.value + '"!');
}
Here's a fiddle: http://jsfiddle.net/Niffler/514gg4tk/
这是一个小提琴:http: //jsfiddle.net/Niffler/514gg4tk/
回答by AmerllicA
Actually, the ticked answer is exactly right, but the answer can be in ES6shape:
实际上,打勾的答案是完全正确的,但答案可能是ES6形状:
HTMLInputElementObject.oninput = () => {
console.log('run'); // Do something
}
Or can be written like below:
或者可以写成如下:
HTMLInputElementObject.addEventListener('input', (evt) => {
console.log('run'); // Do something
});
回答by kai
instead of id use title to identify your element and write the code as below.
而不是 id 使用标题来标识您的元素并编写如下代码。
$(document).ready(()=>{
$("input[title='MyObject']").change(()=>{
console.log("Field has been changed...")
})
});

