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| {{DISPLAYTITLE:GM_getValue}}
| | Something Wrong! Website maintenance!! Go back to [http://wiki.greasespot.net/Main_Page Homepage] or '''set us a bookmark'''?? |
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| == Description ==
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| This method retrieves a value that was set with [[GM_setValue]].
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| See [[GM_setValue]] for details on the storage of these values.
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| Compatibility: [[Version_history#0.3_beta|Greasemonkey 0.3b+]]
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| == Syntax ==
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| {{Function|GM_getValue|name, default}}
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| === Arguments ===
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| ; <code>name</code>
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| : <code>String</code> The property name to get. See [[GM_setValue#Arguments|GM_setValue]] for details.
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| ; <code>default</code>
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| : Optional. Any value to be returned, when no value has previously been set.
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| === Returns ===
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| ; When this <code>name</code> has been set
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| : <code>String</code>, <code>Integer</code> or <code>Boolean</code> as previously set
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| ; When this <code>name</code> has not been set, and <code>default</code> is provided
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| : The value passed as <code>default</code>
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| ; When this <code>name</code> has not been set, and <code>default</code> is not provided
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| : <code>undefined</code>
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| == Examples ==
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| Retrieving the value associated with the name 'foo':
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| <pre class='sample'>
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| //outputs either the value associated to foo, else undefined
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| GM_log(GM_getValue("foo"));
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| </pre>
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| Retrieving the value associated with the name 'timezoneOffset' with a default value defined:
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| <pre class='sample'>
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| //GM_getValue() returns the value -5 (integer) if no value
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| // associated with the name timezoneOffset is found in storage
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| GM_log(GM_getValue("timezoneOffset", -5));
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| </pre>
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| A more complex example:
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| If you have used JSON.stringify to place an object into storage, JSON.parse shall be used to convert it back from a string to a Javascript Object.
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| <pre class='sample'>
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| //Note that if the value associated with foo is an invalid
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| // JSON string, JSON.parse will fail.
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| // Also Note the default value is in quotes (thus a string) rather than an object literal
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| var storedObject = JSON.parse( GM_getValue("foo", "{}") );
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| if(!storedObject) {
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| //JSON.parse() should never return any value that type-casts to false, assume there is an
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| // error in the input string
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| GM_log('Error! JSON.parse failed - The stored value for "foo" is likely to be corrupted.');
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| throw;
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| }
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| </pre>
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| == See Also ==
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| * [[GM_setValue]]
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| * [[GM_deleteValue]]
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| * [[GM_listValues]]
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| [[Category:API_Reference|G]] | | |
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