function enlarge(element) {
var target = document.getElementById(element);
var currentHeight = target.offsetHeight;
var scrollHeight = target.scrollHeight;
var loopTimeout = setTimeout('enlarge(\'' + element + '\')', 10);
if (currentHeight < scrollHeight) {
currentHeight += 1;
} else {
clearTimeout(loopTimeout);
alert("Expansion complete");
}
target.style.height = currentHeight + "px"
}
In this script, the \' is used as an escape character for '. It is being used to construct a string that can be treated as a function, containing a parameter wrapped in single quotes...
'expand(\''
The code above "opens" the string by adding expand( literally, followed by an escaped single quote (\'), and then another single quote to close that part of the string. So it becomes:
expand('
Then, the value of the element variable is concatenated:
'expand(\'' + element
Now, the string looks like this:
expand('elementVariableValue
Next, a new literal string is opened with an additional escaped single quote before closing parentheses:
'\')'
This results in:
')
Putting it all together gives us:
expand('elementVariableValue')
Ultimately, this is interpreted as a function for the timeout.
In JavaScript, both " and ' can be used as string delimiters, so an easier alternative could have been:
setTimeout("expand('" + element + "')", 10);
The piece of code within this instance involves a recursive function call. This particular function acts as a timer, with the callback named expand(element). By grasping this concept, one can easily see that the line
var loopTimer = setTimeout('expand(\'' + element + '\')', 10);expand(element). It's worth noting that the function expand requires a string input, hence why \'' + element + '\' is crucial. Ultimately, when element corresponds to scaleid, we arrive at expand('scaleid'), resulting in yet another call to expand(). Given that it's being represented as a string, the usage of \' serves as an escape character.
When working with JavaScript, it is possible to pass a string as the first parameter of a function. This string will be evaluated similarly to using eval(). For example, you could simulate calling the function "expand('something')" every 10 milliseconds.
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