Javascript jquery 选择选项单击处理程序

jquery select option click handler

提问by john

given:

给出：

<select id="mySelect">
  <option>..</option>
  ...
</select>

Using the select id, how can I trigger a click event on one of the options? I tried attaching the event directly to the select, but this triggers an event whenever the select is clicked on (even if there are no options). Oh, and it is a multi-select (although I don't think that matter).

使用选择 id，如何在其中一个选项上触发点击事件？我尝试将事件直接附加到选择，但是每当点击选择时都会触发一个事件（即使没有选项）。哦，它是一个多选（虽然我认为这无关紧要）。

回答by Matt

You want the 'change' event handler, instead of 'click'.

您需要“更改”事件处理程序，而不是“单击”。

$('#mySelect').change(function(){ 
    var value = $(this).val();
});

回答by Zombyii

$('#mySelect').on('change', function() {
  var value = $(this).val();
  alert(value);
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.0/jquery.min.js"></script>
<select id="mySelect">
  <option value='1'>1</option>
  <option value='2'>2</option>
  <option value='3'>3</option>
  <option value='4'>4</option>
  <option value='5'>5</option>
  <option value='6'>6</option>
  <option value='7'>7</option>
  <option value='8'>8</option>
</select>

---

---

EXAMPLE

例子

回答by tbradley22

you can attach a focus event to select

您可以附加一个焦点事件来选择

$('#select_id').focus(function() {
    console.log('Handler for .focus() called.');
});

回答by Matthew Dolman

The problem that I had with the changehandler was that it triggered on every keypress that I scrolled up and down the <select>.

我在change处理程序上遇到的问题是它在我上下滚动<select>.

I wanted to get the event for whenever an option was clicked or when enterwas pressed on the desired option. This is how I ended up doing it:

我想在单击选项或enter按下所需选项时获取事件。这就是我最终这样做的方式：

let blockChange = false;

$element.keydown(function (e) {

    const keycode = (e.keyCode ? e.keyCode : e.which);

    // prevents select opening when enter is pressed
    if (keycode === 13) {
        e.preventDefault();
    }

    // lets the change event know that these keypresses are to be ignored
    if([38, 40].indexOf(keycode) > -1){
        blockChange = true;
    }

});

$element.keyup(function(e) {

    const keycode = (e.keyCode ? e.keyCode : e.which);
    // handle enter press
    if(keycode === 13) {
        doSomething();
    }

});

$element.change(function(e) {

    // this effective handles the click only as preventDefault was used on enter
    if(!blockChange) {
        doSomething();
    }
    blockChange = false;

});

回答by milad fallahi

its working for me

它为我工作

<select name="" id="select">
    <option value="1"></option>
    <option value="2"></option>
    <option value="3"></option>
</select>

<script>
    $("#select > option").on("click", function () {
       alert(1)
    })
</script>

回答by VladL

One possible solution is to add a class to every option

一种可能的解决方案是为每个选项添加一个类

<select name="export_type" id="export_type">
    <option class="export_option" value="pdf">PDF</option>
    <option class="export_option" value="xlsx">Excel</option>
    <option class="export_option" value="docx">DocX</option>
</select>

and then use the click handler for this class

然后使用这个类的点击处理程序

$(document).ready(function () {

    $(".export_option").click(function (e) {
        //alert('click');
    });

});

UPDATE:it looks like the code works in FF, IE and Opera but not in Chrome. Looking at the specs http://www.w3.org/TR/html401/interact/forms.html#h-17.6I would say it's a bug in Chrome.

更新：看起来代码在 FF、IE 和 Opera 中有效，但在 Chrome 中无效。查看规范http://www.w3.org/TR/html401/interact/forms.html#h-17.6我会说这是 Chrome 中的一个错误。

回答by Igor Aleksic

What I have done in this situation is that I put in the option elements OnClick event like this:

在这种情况下，我所做的是将选项元素放入 OnClick 事件中，如下所示：

<option onClick="something();">Option Name</option>

Then just create a script function like this:

然后只需创建一个这样的脚本函数：

function something(){
    alert("Hello"); 
    }

UPDATE: Unfortunately I can't comment so I'm updating here
TrueBlueAussieapparently jsfiddleis having some issues, check here if it works or not: http://js.do/code/klm

更新：不幸的是，我无法发表评论，所以我在这里更新
TrueBlueAussie显然jsfiddle有一些问题，请在此处检查它是否有效：http: //js.do/code/klm