Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
300 views
in Technique[技术] by (71.8m points)

javascript - Input box value is showing blank on button click

I am trying to pop out input box value but it is showing a blank value. why? Here is the jsfiddle.

$(document).ready(function() {

  var name = $("#name").val();
  $('#showName').click(function() {
    alert(name);
  });

});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" id="name" placeholder="First Name">
   
<button type="button" id="showName">Show name</button>
See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

when you initialize var name in document.ready(), the name variable give a value of input at load of page, so value of name equals to nothing (empty string). so you must change your code that your input value read when button is clicked.

$(document).ready(function() {
    $('#showName').click(function() {
        var name = $("#name").val();
        alert(name);
    });
});

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...