JavaScript-onClick获取被单击按钮的ID

2020/10/04 04:41 · javascript ·  · 0评论

如何找到被点击的按钮的ID?

<button id="1" onClick="reply_click()"></button>
<button id="2" onClick="reply_click()"></button>
<button id="3" onClick="reply_click()"></button>

function reply_click()
{
}

您需要发送ID作为功能参数。像这样做:

<button id="1" onClick="reply_click(this.id)">B1</button>
<button id="2" onClick="reply_click(this.id)">B2</button>
<button id="3" onClick="reply_click(this.id)">B3</button>
    
<script type="text/javascript">
  function reply_click(clicked_id)
  {
      alert(clicked_id);
  }
</script>

这将发送IDthis.id作为clicked_id您可以在您的函数中使用。在这里查看实际操作。

通常,如果您将代码和标记分开,则事情更容易保持井井有条。定义所有元素,然后在JavaScript部分中,定义应在这些元素上执行的各种操作。

调用事件处理程序时,将在被单击的元素的上下文中调用该事件处理程序。因此,标识符将参考的DOM元素,你点击。然后,您可以通过该标识符访问元素的属性。

例如:

<button id="1">Button 1</button>
<button id="2">Button 2</button>
<button id="3">Button 3</button>

<script type="text/javascript">
var reply_click = function()
{
    alert("Button clicked, id "+this.id+", text"+this.innerHTML);
}
document.getElementById('1').onclick = reply_click;
document.getElementById('2').onclick = reply_click;
document.getElementById('3').onclick = reply_click;
</script>

使用纯JAVASCRIPT:我知道已经很晚了,但可能对将来的人有帮助:

在HTML部分:

<button id="1" onClick="reply_click()"></button>
<button id="2" onClick="reply_click()"></button>
<button id="3" onClick="reply_click()"></button>

在Javascipt控制器中:

function reply_click()
{
    alert(event.srcElement.id);
}

这样,我们在调用javascript函数时不必绑定Element的“ id”。

(我认为id属性需要以字母开头。可能是错误的。)

您可以去参加活动委托...

<div onClick="reply_click()">
    <button id="1"></button>
    <button id="2"></button>
    <button id="3"></button>
</div>

function reply_click(e) {
    e = e || window.event;
    e = e.target || e.srcElement;
    if (e.nodeName === 'BUTTON') {
        alert(e.id);
    }
}

...但是,这要求您相对熟悉古怪的事件模型。

<button id="1" onClick="reply_click(this)"></button>
<button id="2" onClick="reply_click(this)"></button>
<button id="3" onClick="reply_click(this)"></button>

function reply_click(obj)
{
var id = obj.id;
}
<button id="1" class="clickMe"></button>
<button id="2" class="clickMe"></button>
<button id="3" class="clickMe"></button>

<script>
$('.clickMe').click(function(){
    alert(this.id);
});
</script>

没有内联JavaScript的情况下如何做

通常建议避免使用内联JavaScript,但是很少有如何使用内联JavaScript的示例。

这是我将事件附加到按钮的方式。


对于推荐的方法与一个简单的
onClick属性相比要花多长时间,我并不完全满意

仅2014浏览器

<button class="btn" id="b1">Button</button>
<script>
let OnEvent = (doc) => {
    return {
        on: (event, className, callback) => {
            doc.addEventListener('click', (event)=>{
                if(!event.target.classList.contains(className)) return;
                callback.call(event.target, event);
            }, false);
        }
    }
};


OnEvent(document).on('click', 'btn', function (e) {
    window.console.log(this.id, e);
});

</script>

仅2013浏览器

<!DOCTYPE html>
<html>
<head>
<script>
(function(doc){
    var hasClass = function(el,className) {
        return el.classList.contains(className);
    }
    doc.addEventListener('click', function(e){
      if(hasClass(e.target, 'click-me')){
          e.preventDefault();
          doSomething.call(e.target, e);
      }
    });
})(document);

function insertHTML(str){
  var s = document.getElementsByTagName('script'), lastScript = s[s.length-1];
  lastScript.insertAdjacentHTML("beforebegin", str);
}

function doSomething(event){
  console.log(this.id); // this will be the clicked element
}
</script>
<!--... other head stuff ...-->
</head>
<body>

<!--Best if you inject the button element with javascript if you plan to support users with javascript disabled-->
<script>
insertHTML('<button class="click-me" id="btn1">Button 1</button>');
</script>

<!--Use this when you don't care about broken buttons when javascript is disabled.-->
<!--buttons can be used outside of forms https://stackoverflow.com/a/14461672/175071 -->
<button class="click-me" id="btn2">Button 2</button>
<input class="click-me" type="button" value="Button 3" id="btn3">

<!--Use this when you want to lead the user somewhere when javascript is disabled-->
<a class="click-me" href="/path/to/non-js/action" id="btn4">Button 4</a>

</body>
</html>

跨浏览器

<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
(function(doc){
    var cb_addEventListener = function(obj, evt, fnc) {
        // W3C model
        if (obj.addEventListener) {
            obj.addEventListener(evt, fnc, false);
            return true;
        } 
        // Microsoft model
        else if (obj.attachEvent) {
            return obj.attachEvent('on' + evt, fnc);
        }
        // Browser don't support W3C or MSFT model, go on with traditional
        else {
            evt = 'on'+evt;
            if(typeof obj[evt] === 'function'){
                // Object already has a function on traditional
                // Let's wrap it with our own function inside another function
                fnc = (function(f1,f2){
                    return function(){
                        f1.apply(this,arguments);
                        f2.apply(this,arguments);
                    }
                })(obj[evt], fnc);
            }
            obj[evt] = fnc;
            return true;
        }
        return false;
    };
    var hasClass = function(el,className) {
        return (' ' + el.className + ' ').indexOf(' ' + className + ' ') > -1;
    }

    cb_addEventListener(doc, 'click', function(e){
      if(hasClass(e.target, 'click-me')){
          e.preventDefault ? e.preventDefault() : e.returnValue = false;
          doSomething.call(e.target, e);
      }
    });
})(document);

function insertHTML(str){
  var s = document.getElementsByTagName('script'), lastScript = s[s.length-1];
  lastScript.insertAdjacentHTML("beforebegin", str);
}

function doSomething(event){
  console.log(this.id); // this will be the clicked element
}
</script>
<!--... other head stuff ...-->
</head>
<body>

<!--Best if you inject the button element with javascript if you plan to support users with javascript disabled-->
<script type="text/javascript">
insertHTML('<button class="click-me" id="btn1">Button 1</button>');
</script>

<!--Use this when you don't care about broken buttons when javascript is disabled.-->
<!--buttons can be used outside of forms https://stackoverflow.com/a/14461672/175071 -->
<button class="click-me" id="btn2">Button 2</button>
<input class="click-me" type="button" value="Button 3" id="btn3">

<!--Use this when you want to lead the user somewhere when javascript is disabled-->
<a class="click-me" href="/path/to/non-js/action" id="btn4">Button 4</a>

</body>
</html>

jQuery跨浏览器

<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
(function($){
    $(document).on('click', '.click-me', function(e){
      doSomething.call(this, e);
    });
})(jQuery);

function insertHTML(str){
  var s = document.getElementsByTagName('script'), lastScript = s[s.length-1];
  lastScript.insertAdjacentHTML("beforebegin", str);
}

function doSomething(event){
  console.log(this.id); // this will be the clicked element
}
</script>
<!--... other head stuff ...-->
</head>
<body>

<!--Best if you inject the button element with javascript if you plan to support users with javascript disabled-->
<script type="text/javascript">
insertHTML('<button class="click-me" id="btn1">Button 1</button>');
</script>

<!--Use this when you don't care about broken buttons when javascript is disabled.-->
<!--buttons can be used outside of forms https://stackoverflow.com/a/14461672/175071 -->
<button class="click-me" id="btn2">Button 2</button>
<input class="click-me" type="button" value="Button 3" id="btn3">

<!--Use this when you want to lead the user somewhere when javascript is disabled-->
<a class="click-me" href="/path/to/non-js/action" id="btn4">Button 4</a>

</body>
</html>

您可以在文档准备好之前运行此程序,因为我们将事件附加到文档上,所以单击按钮将起作用。

这里有一个 jsfiddle。

出于某种奇怪的原因
insertHTML,即使功能在我所有的浏览器中都可以使用,但功能在其中不起作用。

您可以随时替换insertHTMLdocument.write如果您不介意缺点,

<script>
document.write('<button class="click-me" id="btn1">Button 1</button>');
</script>

资料来源:

如果您不想将任何参数传递给onclick函数,只需使用event.target即可获取clicked元素:

<button id="1" onClick="reply_click()"></button>
<button id="2" onClick="reply_click()"></button>
<button id="3" onClick="reply_click()"></button>

function reply_click()
{
    // event.target is the element that is clicked (button in this case).
    console.log(event.target.id);
}

使用纯JavaScript,您可以执行以下操作:

var buttons = document.getElementsByTagName("button");
var buttonsCount = buttons.length;
for (var i = 0; i < buttonsCount; i += 1) {
    buttons[i].onclick = function(e) {
        alert(this.id);
    };
}​

JsFiddle上检查

您可以这样简单地进行操作:

<input type="button" id="1234" onclick="showId(this.id)" value="click me to show my id"/>
<script type="text/javascript">
   function showId(obj) {
        var id=obj;
        alert(id);
   }

<button id="1" onClick="reply_click()"></button>
<button id="2" onClick="reply_click()"></button>
<button id="3" onClick="reply_click()"></button>

function reply_click()
{
   console.log(window.event.target.id)
}
 <button id="1"class="clickMe"></button>

<button id="2" class="clickMe"></button>

<button id="3" class="clickMe"></button>



$('.clickMe').live('click',function(){

var clickedID = this.id;

});

按钮1按钮2按钮3

var reply_click = function() { 
     alert("Button clicked, id "+this.id+", text"+this.innerHTML); 
} 
document.getElementById('1').onclick = reply_click; 
document.getElementById('2').onclick = reply_click; 
document.getElementById('3').onclick = reply_click;

对不起,它的回答很晚,但是如果您这样做,它的确很快:-

$(document).ready(function() {
  $('button').on('click', function() {
     alert (this.id);
  });
});

这将获得单击的任何按钮的ID。

如果您只想在特定位置获得按钮点击的价值,只需将它们放在类似

<div id = "myButtons"> buttons here </div>

并将代码更改为:-

 $(document).ready(function() {
      $('.myButtons button').on('click', function() {
         alert (this.id);
      });
    });

我希望这有帮助

这将记录被单击的元素的ID:addFields。

<button id="addFields" onclick="addFields()">+</button>

<script>

function addFields(){ 
    console.log(event.toElement.id)
}

</script>

这是对Prateek答案的改进-事件是通过参数传递的,因此reply_click不需要使用全局变量(并且到目前为止,没有主体提供此变体)

function reply_click(e) {
  console.log(e.target.id);
}
<button id="1" onClick="reply_click(event)">B1</button>
<button id="2" onClick="reply_click(event)">B2</button>
<button id="3" onClick="reply_click(event)">B3</button>
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