Javascript angularjs自定义过滤器,用于在对象数组中搜索
我有一个目标Javascript angularjs自定义过滤器,用于在对象数组中搜索,javascript,angularjs,angularjs-ng-repeat,angularjs-filter,Javascript,Angularjs,Angularjs Ng Repeat,Angularjs Filter,我有一个目标 {"A":[],"B":[],"C":[],"D":[],"E":[],"F":[{"name":"Fargo","id":29}],"G":[],"H":[],"I":[],"J":[],"K":[],"L":[],"M":[],"N":[],"O":[],"P":[],"Q":[],"R":[],"S":[{"name":"Sullivan","id":23},{"name":"Sven","id":26}],"T":[],"U":[],"V":[],"W":[],"X":[]
{"A":[],"B":[],"C":[],"D":[],"E":[],"F":[{"name":"Fargo","id":29}],"G":[],"H":[],"I":[],"J":[],"K":[],"L":[],"M":[],"N":[],"O":[],"P":[],"Q":[],"R":[],"S":[{"name":"Sullivan","id":23},{"name":"Sven","id":26}],"T":[],"U":[],"V":[],"W":[],"X":[],"Y":[],"Z":[],"#":[]}
我需要基于对象名编写一个角度js过滤器。我希望在用户每次输入新字符时都显示一个结果
为此,我创建了这个过滤器
:
app.filter('alphabeticSearch', function () {
return function (obj,query) {
if (!query) {
return obj;
}
var filtered = {};
for (var i = 65; i < 91; i++) {
filtered[String.fromCharCode(i)] = [];
}
filtered['#'] = [];
for (i in obj) {
var _this = obj[i];
filtered[i] = _this.filter(function (ele) {
var reg = new RegExp(query, "gi");
return reg.test(ele.name);
})
}
return filtered;
};
});
这就是我如何使用HTML中的过滤器
<input type='text' id='cSearch' ng-model='ent' value='' />
<div ng-repeat="(letter,obj) in item | alphabeticSearch:ent">
....
</div>
....
这是因为您的筛选器每次都为相同的obj
和query
检索一个新实例
Angular将在每个diggest
中计算过滤器的表达式,以查找更改,因此在每个diggest
中,Angular将检查过滤器的结果,除非过滤器的某个参数发生了更改,否则Angular希望结果相同。您可能会认为筛选器的代码每次都在检索完全相同的内容,但事实并非如此,因为您的函数每次都在创建一个新实例,这使得angular认为内容不一样,因此它尝试再次重新计算,以便从筛选器函数获得一致的响应,但您的函数正在再次检索新对象,因此angular将再次尝试。。。当这种情况发生10次时,angular将中止进程并引发异常
更改过滤器中的一些内容可以解决此问题:
app.filter('alphabeticSearch', function () {
var filtered = {};
var lastObj={};
var lastQuery="";
return function (obj,query) {
if (!query)
return obj;
if(angular.equals(obj, lastObj) && angular.equals(query,lastQuery))
return filtered;
lastObj = angular.copy(obj);
lastQuery = angular.copy(query);
filtered={};
for (var i = 65; i < 91; i++) {
filtered[String.fromCharCode(i)] = [];
}
filtered['#'] = [];
for (i in obj) {
var _this = obj[i];
filtered[i] = _this.filter(function (ele) {
var reg = new RegExp(query, "gi");
return reg.test(ele.name);
})
}
return filtered;
};
});
app.filter('字母搜索',函数(){
var-filtered={};
var lastObj={};
var lastQuery=“”;
返回函数(obj,查询){
如果(!查询)
返回obj;
if(angular.equals(obj,lastObj)和&angular.equals(query,lastQuery))
返回过滤;
lastObj=角度复制(obj);
lastQuery=angular.copy(查询);
过滤={};
对于(变量i=65;i<91;i++){
过滤后的[String.fromCharCode(i)]=[];
}
过滤的['#']=[];
用于(obj中的i){
var_this=obj[i];
过滤[i]=\u此过滤器(函数(ele){
var reg=新的RegExp(查询,“gi”);
返回注册测试(元素名称);
})
}
返回过滤;
};
});
app.filter('alphabeticSearch', function () {
var filtered = {};
var lastObj={};
var lastQuery="";
return function (obj,query) {
if (!query)
return obj;
if(angular.equals(obj, lastObj) && angular.equals(query,lastQuery))
return filtered;
lastObj = angular.copy(obj);
lastQuery = angular.copy(query);
filtered={};
for (var i = 65; i < 91; i++) {
filtered[String.fromCharCode(i)] = [];
}
filtered['#'] = [];
for (i in obj) {
var _this = obj[i];
filtered[i] = _this.filter(function (ele) {
var reg = new RegExp(query, "gi");
return reg.test(ele.name);
})
}
return filtered;
};
});