[英]How to watch multiple property change using angularjs
I have two properties to watch for and update the third depends on change in first two. 我有两个要监视和更新的属性,第三个属性取决于前两个属性的更改。 here is my code Can anyone help me on this?
这是我的代码,有人可以帮我吗?
return {
context: 'prop1',
watch: [
{
property: ["prop2","prop3"], // this to watch for
update: [
{
dest: "prop4", // update this prop based on change in prop2 and prop3
src: [function (value) {
if (value.prop2change === 'thisvalue') {
return prop3changevalue;
}
else
return 0;
},"newValue"]
}
}
]
}
Using $scope.$watchGroup , which is new in angular.js 1.3 ( In angular 1.2 use $watch ) 使用$ scope。$ watchGroup ,这是angular.js 1.3中的新功能(在angular 1.2中使用$ watch)
$scope.igor = 'Ershov'
$scope.matias = 'Pachuli'
var names = ['igor', 'matias']
$scope.$watchGroup(names, function(newValues, oldValues) {
// do something
});
newValues and oldValues are arrays and indecies correspond to index of property in first parameter to $watchGroup. newValues和oldValues是数组,并且indecies对应于$ watchGroup的第一个参数中的属性索引。
See fiddle: https://jsfiddle.net/7je6r2mn/1/ 参见小提琴: https : //jsfiddle.net/7je6r2mn/1/
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