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How:Write scripts in JavaScript for Memento: Difference between revisions
How:Write scripts in JavaScript for Memento (view source)
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For instance, trigger scripts are the most often used type of script, and in trigger scripts, it is very common and common practice to define a variable e to contain the current Entry object <code>var e = entry()</code>. Then, you can say <code>e.field()</code> instead of <code>entry().field()</code>. This not only saves keystrokes & makes the code more readable, but also runs a bit faster, because the <code>entry()</code> function is run only once in the script. This might be the first thing you'd think of to share. Of course, <code>entry()</code> is not called at all in ''library'' action scripts, for instance, so <code>e</code> will not be used in such scripts, but it doesn't hurt much at all, so it's OK that the code is shared also to these scripts. | For instance, trigger scripts are the most often used type of script, and in trigger scripts, it is very common and common practice to define a variable e to contain the current Entry object <code>var e = entry()</code>. Then, you can say <code>e.field()</code> instead of <code>entry().field()</code>. This not only saves keystrokes & makes the code more readable, but also runs a bit faster, because the <code>entry()</code> function is run only once in the script. This might be the first thing you'd think of to share. Of course, <code>entry()</code> is not called at all in ''library'' action scripts, for instance, so <code>e</code> will not be used in such scripts, but it doesn't hurt much at all, so it's OK that the code is shared also to these scripts. | ||
Another powerful category of shared code is the shared function. For instance, consider the following function for shared use: | |||
<pre> | |||
// Function to return a formatted string given the following arguments: | |||
// number: A number of type Number representing an amount of currency, such as a price | |||
// decPlaces: The number of decimal places to which to format the number, defaulting to 2 | |||
// decSep: The character to use to separate the integral part of the amount from the | |||
// decimal fractional part, defaulting to "." | |||
// thouSep:The character to use to separate the factors of one thousand from each other, | |||
// defaulting to "," | |||
function formatMoney(number, decPlaces, decSep, thouSep) { | |||
decPlaces = isNaN(decPlaces = Math.abs(decPlaces)) ? 2 : decPlaces, | |||
decSep = typeof decSep === "undefined" ? "." : decSep; | |||
thouSep = typeof thouSep === "undefined" ? "," : thouSep; | |||
var sign = number < 0 ? "-" : ""; | |||
var i = String(parseInt(number = Math.abs(Number(number) || 0).toFixed(decPlaces))); | |||
var j = (j = i.length) > 3 ? j % 3 : 0; | |||
return sign + | |||
(j ? i.substr(0, j) + thouSep : "") + | |||
i.substr(j).replace(/(\decSep{3})(?=\decSep)/g, "$1" + thouSep) + | |||
(decPlaces ? decSep + Math.abs(number - i).toFixed(decPlaces).slice(2) : ""); | |||
} | |||
</pre> | |||
== Trigger script == | == Trigger script == | ||