I define a watcher in an function. it outputs changed one time... im not 
sure if i understand it right, but the watcher should output changed 
everytime tht string is longer than 30?

this.watchValues = function(){
    selfscope.$watch('self.cacher.advertisement.data.post_text', 
function(newVal,oldVal) {
        if(newVal.length > 30) {
            console.log('changed');
        }
    });
}


hope somebody can help me. thx

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