goog.ds.Expr Classgoog.ds.Expr(opt_expr)Create a new expression. An expression uses a string expression language, and from this string and a passed in DataNode can evaluate to a value, DataNode, or a DataNodeList.
opt_expr {string=}
.ALL_ATTRIBUTESFor DOM interop - all DOM attribute nodes Attribute nodes have dataName starting with "@"
.ALL_CHILD_NODESFor DOM interop - all DOM child nodes (text + element). Text nodes have dataName #text
.ALL_ELEMENTSFor DOM interop - all DOM element child nodes
.COUNTGet the count of nodes matching an expression
.CURRENTThe current node
.NAMEGet the dataName of a node
.POSITIONGet the position of the "current" node in the current node list This will only apply for datasources that support the concept of a current node (none exist yet). This is similar to XPath position() and concept of current node
.create(expr)Create an expression from a string, can use cached values
expr {string}
goog.ds.Expr}
.getLast()Gets the last part of the expression.
string}
.getNext()Gets the parent expression of this expression, or null if this is top level
goog.ds.Expr}
.getNode(opt_ds, opt_canCreate)Evaluate an expression on a data node, and return the first matching node Recursively walks through child nodes to evaluate
opt_ds {goog.ds.DataNode=}
opt_canCreate {boolean=}
goog.ds.DataNode}
.getNodes(opt_ds, opt_canCreate)Evaluate an expression on a data node, and return matching nodes Recursively walks through child nodes to evaluate
opt_ds {goog.ds.DataNode=}
opt_canCreate {boolean=}
goog.ds.DataNodeList}
.getParent()Gets the parent expression of this expression, or null if this is top level
goog.ds.Expr}
.getSource()Get the source data path for the expression
string}
.getValue(opt_ds)Evaluate an expression on a data node, and return a value Recursively walks through child nodes to evaluate TODO(user) Support other expression functions
opt_ds {goog.ds.DataNode=}