Before submitting form programmatically

问题

In jQuery-Mobile I'm submitting a form programmatically and I want to capture the submit event to perform some validations before. I have already tried the following solution provided in other questions about jQuery:

$(document).ready(function(){
  $('#my_form').bind('submit', function() {
    alert('before submit');

    ...

  });
});

But I cannot get the function executed and the alert displayed. Does anyone know any other way to achieve this?

My form is something like:

<form id="my_form" method="POST" action="..." data-theme="b">

And the way I am calling it programmatically, from another section of the same page is like this:

<input type="submit" onclick="document.forms['my_form'].submit(); return false;" value="Submit" data-theme="b"/>

Thank you in advance for your help.

回答1:

The submit handler of the form is NOT executed when you submit the form programatically.

NOTE: Do NOT use a submit button to programatically submit a form. Instead use button or allow the submission from the submit button to be handled, i.e.

<input type="button" onclick="document.forms['my_form'].submit()" value="Submit another form" data-theme="b"/>

(the above is not correct anyway since it needs the form to have a NAME, not just an ID)

<input type="button" onclick="document.forms['my_form_NAME'].submit()" value="Submit another form" data-theme="b"/>

<input type="button" onclick="document.getElementById('my_form_ID').submit()" value="Submit another form" data-theme="b"/>

OR since you have jQuery:

<input type="button" onclick="$('#my_form_ID'].submit()" value="Submit another form" data-theme="b"/>

OR if you can put the button in the form (best way):

<input type="submit" value="Submit THIS form" data-theme="b"/>

But since you want to bind - here is how to submit using another button instead of the better way using the form's own submit button:

<form id="actualForm">...
.
.

</form>


<input type="button" id="subbut" value="Submit another form on this page" data-theme="b"/>

$(document).ready(function(){
  $('#subbut').bind('click', function() {
    alert('before submit');

    ...

    $("#actualForm").submit();
  });
});

If there is hardcoded inline behaviour you cannot change, use the jQuery to remove it too

How can I remove an inline onclick attribute with a bookmarklet?

$(document).ready(function(){
  $('#subbut').attr('onclick',""); // or $('#subbut').onclick=null;
  $('#subbut').bind('click', function() {
    alert('before submit');

    ...

    $("#actualForm").submit();
  });
});

回答2:

Refer these links

JQUERY Validate plugin

Validation techniques

回答3:

Since you use jquery, you can find the method and examples here:

Submit validation

回答4:

Changing the return value of onClick to TRUE does the job:

<input type="submit" onclick="document.forms['my_form'].submit(); return ***true***;" vakue="Submit" data-theme="b"/>

来源：https://stackoverflow.com/questions/8294195/before-submitting-form-programmatically

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javascript

jquery

jquery-mobile