ul li $（this）.text（）不显示任何内容

Question

SOLVED! actually the problem was in $(document).ready(function(){//}); after i used it, it worked fine. thanks for your help and sorry because of such silly mistake.

I'm trying to get selected li from bootstrap dropdown menu. It works but when i want to get the text of selected li, it shows nothing.

<div class="btn-group">
    <a class="btn dropdown-toggle" data-toggle="dropdown" href="#">
        <font id="dropdownMenu" >inch</font>
        <span class="caret"></span>
    </a>
    <ul id="dropdownList" class="dropdown-menu">
        <li><a href="#">inch</a></li>
        <li><a href="#">cm</a></li>
        <li><a href="#">mm</a></li>
    </ul>
</div>

js:

$('#dropdownList li').click(function () {
    console.log($(this).text());
    document.getElementById('dropdownMenu').innerHTML = $(this).text();
});

May i know why it's not working?

Thanks!

Answer 1

Get the text of an anchor tag inside. That's the element with text.

$('#dropdownList li').click(function () {
    console.log($(this).find('a').text());
    document.getElementById('dropdownMenu').innerHTML = $(this).find('a').text();
});

Answer 2

Use Jquery:

JSFiddle

$('#dropdownList li').click(function () {
    console.log($(this).text());
    $('#dropdownMenu').text($(this).text());
});

Answer 3

You should try to limit DOM reading/writing, like using .find() and the .text() etc. I would add some data in the markup

HTML:

<ul id="dropdownList" class="dropdown-menu">
  <li data-value="inch"><a href="#">inch</a></li>
  <li data-value="cm"><a href="#">cm</a></li>
  <li data-value="mm"><a href="#">mm</a></li>
</ul>

JS:

$('#dropdownList li').click(function () {
  console.log($(this).data('value'))
})

Working Demo

Two things:

• The data-* are valid HTML5 tags that you can use to fit your needs.
• Don't re-read the DOM for each clicks var dropdownValue = $('#value') .