# graphprototype.update

### Description

`object graphprototype.update(object/array graphPrototypes)`

This method allows to update existing graph prototypes.

### Parameters

`(object/array)` Graph prototype properties to be updated.

The `graphid` property must be defined for each graph prototype, all
other properties are optional. Only the passed properties will be
updated, all others will remain unchanged.

Additionally to the [standard graph prototype
properties](object#graph_prototype), the method accepts the following
parameters.

|Parameter|Type|Description|
|---------|----|-----------|
|gitems|array|Graph items to replace existing graph items. If a graph item has the `gitemid` property defined it will be updated, otherwise a new graph item will be created.|

### Return values

`(object)` Returns an object containing the IDs of the updated graph
prototypes under the `graphids` property.

### Examples

#### Changing the size of a graph prototype

Change the size of a graph prototype to 1100 to 400 pixels.

Request:

``` {.java}
{
    "jsonrpc": "2.0",
    "method": "graphprototype.update",
    "params": {
        "graphid": "439",
        "width": 1100,
        "height": 400
    },
    "auth": "038e1d7b1735c6a5436ee9eae095879e",
    "id": 1
}
```

Response:

``` {.java}
{
    "jsonrpc": "2.0",
    "result": {
        "graphids": [
            "439"
        ]
    },
    "id": 1
}
```

### Source

CGraphPrototype::update() in
*frontends/php/include/classes/api/services/CGraphPrototype.php*.