lowpro autosave behavior to POST JSON

December 20th, 2007 • Uncategorized

Event.addBehavior({
  '.autosave': Behavior.create({
    onchange : function() {
      var source = this.element;
      var name = source.name.split('['); // name according to rails convention
      var model = name[0]; // rails model name
      var resource = model + 's'; // rails resource (TODO better pluralization)
      var id = name[1].substring(0, name[1].length - 1); // rails model id

      var authToken = 'authenticity_token=' + $('auth-token').getValue()
      if(name[1].match(/new/)) {
        var url = '/' + resource + '?' + authToken
      } else {
        var url = '/' + resource + '/' + id + '?_method=put&' + authToken;
      }

      var inputs = $(source.parentNode).id.split('-');

      new Ajax.Request(url, {
        method: 'post',
        contentType: "application/json",
        postBody: Object.toJSON({
          survey_execution_id: $('survey_execution_id').getValue(),
          question_application_input_id: inputs[1],
          time_line_offset: inputs[2],
          value: source.getValue()
        })
      });
    }
  });
});

Tags: ajax, javascript, json, lowpro

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