admin管理员组

文章数量:1289581

Here is my HTML/JavaScript:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" ".dtd">
<html xmlns="">
<head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
    <script type="text/javascript" src="/script/jquery.js"></script>
    <script type="text/javascript">
        $(function(){
            var $str = "hello world";

            function foo() {
                alert($str);
            }
        });
    </script>
</head>
<body>
    <form name="statusUpdateForm" method="post">
        <input type="button" name="submitButton" value=" " onclick="foo();" />
    </form>
</body>
</html>

When I click the button, I get a JavaScript error stating that foo is not defined. How can I call a JavaScript function declared inside document.ready()??

Here is my HTML/JavaScript:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3/1999/xhtml">
<head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
    <script type="text/javascript" src="/script/jquery.js"></script>
    <script type="text/javascript">
        $(function(){
            var $str = "hello world";

            function foo() {
                alert($str);
            }
        });
    </script>
</head>
<body>
    <form name="statusUpdateForm" method="post">
        <input type="button" name="submitButton" value=" " onclick="foo();" />
    </form>
</body>
</html>

When I click the button, I get a JavaScript error stating that foo is not defined. How can I call a JavaScript function declared inside document.ready()??

  • javascript
  • jquery
  • methods
  • undefined
Share Improve this question asked May 25, 2011 at 19:09 Eric BelairEric Belair 10.7k13 gold badges77 silver badges121 bronze badges 1
  • Related question here. stackoverflow./questions/1055767/… – c4il Commented May 25, 2011 at 19:28
Add a ment  | 

5 Answers 5

Reset to default 7

You're placing the function's scope within another function, basically.

Picture this:

<script>
  document.onload = function(){
    function foo(){
      alert('bar');
    }
  };
  foo();
</script>

That is the facsimile of what you're trying to acplish. Just like variables defined within a function are off limits outside of it, function names take on the same characteristics.

Side-Note JavaScript doesn't require $ prefix on variable names (though is acceptable as far as names are concerned). I didn't know if you're ing from PHP and are just accustomed or were aware.

Thought I'd make my ment an answer.

Try this:

$(function() {
    window.foo = function () {
        alert('bar');
    }
});

Basically, you need to expose the function to global scope.

Variables and methods declared inside the $(function() function are only accessible within that. If you need to use those outside, you you make it in the global namespace like

window.functionName = functionName;

You can not, it is private to that scope.

What I ended up doing - what I should have done in the first place - is adding a click handler for the submit button:

$("input[name='submitButton']").click(function(){...});

本文标签： javascriptWhy is a function declared in documentready() not defined when calledStack Overflow

版权声明：本文标题：javascript - Why is a function declared in document.ready() not defined when called? - Stack Overflow 内容由网友自发贡献，该文观点仅代表作者本人， 转载请联系作者并注明出处：http://www.betaflare.com/web/1741427020a2378134.html， 本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌抄袭侵权/违法违规的内容，一经查实，本站将立刻删除。