Appending to JSON notation ?

Question

Hello, I have the following JSON object:

new Ajax.Request(url, {
   method: 'post',
   contentType: "application/x-www-form-urlencoded",
   parameters: {
          "javax.faces.ViewState": encodedViewState,
          "client-id": options._clientId,
          "component-value": options._componentValue
   }
});

Now, I would like to be able to append to the "Parameters" object programattically, but I am unsure of how I would actually do this.

Answer 1

you can simply assign to it. But you might want to do that before creating the request.

var parameters = {
      "javax.faces.ViewState": encodedViewState,
      "client-id": options._clientId,
      "component-value": options._componentValue
}
parameters.foo = 'bar';

var myAjax = new Ajax.Request(url, {
    method: 'post',
    contentType: "application/x-www-form-urlencoded",
    parameters: parameters
});

Answer 2

You can't append to it after you call new, because Prototype automatically sends and starts processing the Ajax request upon creation, instead do something like this if you need to alter the parameters object:

var params = {
      "javax.faces.ViewState": encodedViewState,
      "client-id": options._clientId,
      "component-value": options._componentValue
      // Either add your additional properties here as:
      // propertyName : propertyValue
};
// Or add your properties here as:
// params.propertyName = propertyValue;
new Ajax.Request(url, {

method: 'post',

contentType: "application/x-www-form-urlencoded",

parameters: params
});

Answer 3

Assume that the JSON object is named as obj in the Ajax.Request Javascript function. You could now add to the parameters object like this:

obj['parameters']['someproperty'] = 'somevalue';

Hope this helps