Submit a form and get a JSON response with jQuery

Question

I expect this is easy, but I'm not finding a simple explanation anywhere of how to do this. I have a standard HTML form like this:

<form name="new_post" action="process_form.json" method=POST>       <label>Title:</label>       <input id="post_title" name="post.title" type="text" /><br/>        <label>Name:</label><br/>       <input id="post_name" name="post.name" type="text" /><br/>        <label>Content:</label><br/>       <textarea cols="40" id="post_content" name="post.content" rows="20"></textarea>     <input id="new_post_submit" type="submit" value="Create" /> </form> 

I'd like to have javascript (using jQuery) submit the form to the form's action (process_form.json), and receive a JSON response from the server. Then I'll have a javascript function that runs in response to the JSON response, like

  function form_success(json) {      alert('Your form submission worked');      // process json response   } 

How do I wire up the form submit button to call my form_success method when done? Also it should override the browser's own navigation, since I don't want to leave the page. Or should I move the button out of the form to do that?

Answer 1

If you want to get the response in a callback, you can't post the form. Posting the form means that the response is loaded as a page. You have to get the form data from the fields in the form and make an AJAX request.

Example:

$(function(){   $('form[name=new_post]').submit(function(){     $.post($(this).attr('action'), $(this).serialize(), function(json) {       alert(json);     }, 'json');     return false;   }); }); 

Notice that you have to return false from the method that handles the submit event, otherwise the form will be posted also.