作者:TzXh爱是生活 | 来源:互联网 | 2023-09-09 14:49
当您的textarea超过15个字符时,result
变为undefined
-这就是ng-
min/maxlength
指令的工作方式。我认为您必须编写自己的指令。这是一条指令,它将在15个字符后阻止输入:
app.directive('myMaxlength', function() {
return {
require: 'ngModel',
link: function (scope, element, attrs, ngModelCtrl) {
var maxlength = Number(attrs.myMaxlength);
function fromUser(text) {
if (text.length > maxlength) {
var transformedInput = text.substring(0, maxlength);
ngModelCtrl.$setViewValue(transformedInput);
ngModelCtrl.$render();
return transformedInput;
}
return text;
}
ngModelCtrl.$parsers.push(fromUser);
}
};
});
[fiddle](http://jsfiddle.net/bZGcg/)
允许超过15个字符,但是当计数超过15个时禁用提交按钮:
link: function (scope, element, attrs, ngModelCtrl) {
var maxlength = Number(attrs.myMaxlength);
function fromUser(text) {
ngModelCtrl.$setValidity('unique', text.length <= maxlength);
return text;
}
ngModelCtrl.$parsers.push(fromUser);
}
[fiddle](http://jsfiddle.net/bZGcg/1/)