Version 3.17.2

YUI~substitute Class

This class is deprecated.

The following methods are added to the YUI instance

Use Y.Lang.sub or Y.Template instead.

Item Index




  • s
  • o
  • f
  • recurse
String deprecated

Use Y.Lang.sub or Y.Template instead.

Does {placeholder} substitution on a string. The object passed as the second parameter provides values to replace the {placeholder}s. {placeholder} token names must match property names of the object. For example

var greeting = Y.substitute("Hello, {who}!", { who: "World" });

{placeholder} tokens that are undefined on the object map will be left in tact (leaving unsightly "{placeholder}"s in the output string). If your replacement strings should include curly braces, use {LBRACE} and {RBRACE} in your object map string value.

If a function is passed as a third argument, it will be called for each {placeholder} found. The {placeholder} name is passed as the first value and the value from the object map is passed as the second. If the {placeholder} contains a space, the first token will be used to identify the object map property and the remainder will be passed as a third argument to the function. See below for an example.

If the value in the object map for a given {placeholder} is an object and the dump module is loaded, the replacement value will be the string result of calling Y.dump(...) with the object as input. Include a numeric second token in the {placeholder} to configure the depth of the call to Y.dump(...), e.g. "{someObject 2}". See the dump method for details.


  • s String

    The string that will be modified.

  • o Object

    An object containing the replacement values.

  • f Function

    An optional function that can be used to process each match. It receives the key, value, and any extra metadata included with the key inside of the braces.

  • recurse Boolean

    if true, the replacement will be recursive, letting you have replacement tokens in replacement text. The default is false.



the substituted string.


    function getAttrVal(key, value, name) {
        // Return a string describing the named attribute and its value if
        // the first token is @. Otherwise, return the value from the
        // replacement object.
        if (key === "@") {
            value += name + " Value: " + myObject.get(name);
        return value;

    // Assuming myObject.set('foo', 'flowers'),
    // => "Attr: foo Value: flowers"
    var attrVal = Y.substitute("{@ foo}", { "@": "Attr: " }, getAttrVal);