The beast's angular Api learning, translating and understanding-$interpolate and $parse

ng API Learning for Beasts--$interpolate and $parse

$interpolate

Compiles a string into an interpolation function. The HTML compilation service uses this service to complete data binding.

The $interpolate comes with an optional fourth parameter, allornothing. If Allornothing is true, the interpolation function will return undefined unless all embedded expressions are evaluated as not undefined.

Using code:

<div ng-app= "Demo" >

<div ng-controller= "Democtrl" >

<input ng-model= "Text2"/>

{{Value}}

</div>

</div>

<script>

Angular.module (' Demo ', [])

. Controller ("Democtrl", ["$scope", "$interpolate", Function ($scope, $interpolate) {

var obj = {text1: "Hello", Text2: "World"};

$scope. Text2 = "World";

$scope. $watch ("Text2", function (N,o) {

var interpolate = $interpolate ("{{Text1}}" +n);

$scope. Value = interpolate (obj);

})

}])

</script>

$parse

Converts an angular expression to a function.

Use: $parse (expression);

Expression: The expressions that are compiled.

Return: Represents the compiled function of an expression. function (context,locals)

Context: An object that contains an expression (usually a scope object) in the statement that needs to be parsed.

Locals: Object, the context object of the local variable, used to override the value in the context.

The returned function contains a property:

Literal:boolean, whether the top node of the expression is a JavaScript literal.

Constant:boolean, whether the expression is all composed of JavaScript constant literals.

Assign:function (context,locals), which can be used to modify the value of an expression in a given context.

Using code:

Angular.module (' Demo ', [])

. Controller ("Democtrl", ["$scope", "$parse", Function ($scope, $parse) {

var obj = {

Text: "World"

};

var parses = $parse ("' Hello ' + text");

var v = parses (obj);//Hello World

}])

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The beast's angular Api learning, translating and understanding-$interpolate and $parse