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POTesting if value is a function
 

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    <p>I need to test whether the value of a form's <code>onsubmit</code> is a function. The format is typically <code>onsubmit="return valid();"</code>. Is there a way to tell if this is a function, and if it's callable? Using typeof just returns that it's a string, which doesn't help me much.</p> <p><strong>EDIT</strong>: Of course, I understand that "return valid();" is a string. I've <code>replace</code>d it down to "valid();", and even "valid()". I want to know if either of those is a function.</p> <p><strong>EDIT</strong>: Here's some code, which may help explain my problem:</p> <pre><code>$("a.button").parents("form").submit(function() { var submit_function = $("a.button").parents("form").attr("onsubmit"); if ( submit_function &amp;&amp; typeof( submit_function.replace(/return /,"") ) == 'function' ) { return eval(submit_function.replace(/return /,"")); } else { alert("onSubmit is not a function.\n\nIs the script included?"); return false; } } ); </code></pre> <p><strong>EDIT 2</strong>: Here's the new code. It seems that I still have to use an eval, because calling form.submit() doesn't fire existing onsubmits.</p> <pre><code>var formObj = $("a.button").parents("form"); formObj.submit(function() { if ( formObj[0].onsubmit &amp;&amp; typeof( formObj.onsubmit ) == 'function' ) { return eval(formObj.attr("onsubmit").replace(/return /,"")); } else { alert("onSubmit is not a function.\n\nIs the script included?"); return false; } } ); </code></pre> <p>Suggestions on possibly how to do this better?</p>
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