I am looking for ways to limit the value inside the input to 4 and process the 4 digit value unto my controller.
<input type="number" class="form-control input-lg"
ng-model="search.main" placeholder="enter first 4 digits: 09XX">
{{ search.main | limitTo:4}}
Can always make a directive for it:
app.directive("limitTo", [function() {
return {
restrict: "A",
link: function(scope, elem, attrs) {
var limit = parseInt(attrs.limitTo);
angular.element(elem).on("keypress", function(e) {
if (this.value.length == limit) e.preventDefault();
});
}
}
}]);
<input limit-to="4" type="number" class="form-control input-lg" ng-model="search.main" placeholder="enter first 4 digits: 09XX">
You can always use ng-minlength, ng-maxlength for string length and min, max for number limits. Try this
<input type="number"
name="input"
class="form-control input-lg"
ng-model="search.main"
placeholder="enter first 4 digits: 09XX"
ng-minlength="1"
ng-maxlength="4"
min="1"
max="9999">
DEMO FIDDLE
I used the accepted answer as a launching point, but this is what I came up with.
angular.module('beastTimerApp')
.directive('awLimitLength', function () {
return {
restrict: "A",
require: 'ngModel',
link: function (scope, element, attrs, ngModel) {
attrs.$set("ngTrim", "false");
var limitLength = parseInt(attrs.awLimitLength, 10);// console.log(attrs);
scope.$watch(attrs.ngModel, function(newValue) {
if(ngModel.$viewValue.length>limitLength){
ngModel.$setViewValue( ngModel.$viewValue.substring(0, limitLength ) );
ngModel.$render();
}
});
}
};
});
usage
<input name="name" type="text" ng-model="nameVar" aw-limit-length="10"/>
The key is to use $setViewValue() and $render() to set and display the changes respectively. This will make sure $viewValue and $modelValue are correct and displayed properly. You also want to set ngTrim to false to prevent the user adding whitespaces beyond the limit. This answer is an amalgamation of @tymeJV's answer and this blog post... https://justforchangesake.wordpress.com/2015/01/10/useful-angularjs-directives/
Will do it allowing backspaces and deletes.
app.directive("limitTo", [function() {
return {
restrict: "A",
link: function(scope, elem, attrs) {
var limit = parseInt(attrs.limitTo);
angular.element(elem).on("keydown", function() {
if(event.keyCode > 47 && event.keyCode < 127) {
if (this.value.length == limit)
return false;
}
});
}
}
}]);
No need to use an AngularJS directive.
Just use the good old standard html attribute maxlength.
<input type="text" maxlength="30" />
you can use this code:
<input type="number" class="form-control input-lg"
ng-model="search.main"
ng-keypress="limitKeypress($event,search.main,4)"
placeholder="enter first 4 digits: 09XX">
and AngularJS code:
$scope.limitKeypress = function ($event, value, maxLength) {
if (value != undefined && value.toString().length >= maxLength) {
$event.preventDefault();
}
}
We can use ng-value instead:
ng-value="(minutes > 60 ? minutes = 0 : minutes)"
In html code:
<input type="text" class="form-control" ng-model="minutes" ng-maxlength="2" ng-pattern="/^[0-9]*$/" ng-value="(minutes > 60 ? minutes = 0 : minutes)"/>
This will check for the value and if it is greater than 60, it replaces the value with 0.
As there is a problem in above directive (answer of tymeJV). If you enter maximum length once, then it will not accept any other character even the backspace. That is if limit-to="4" and if you entered 4 character in input box, then you will not able to delete it. SO here is the updated answer.
app.directive("limitTo", [function () {
return {
restrict: "A",
link: function (scope, elem, attrs) {
var limit = parseInt(attrs.limitTo);
elem.bind('keypress', function (e) {
// console.log(e.charCode)
if (elem[0].value.length >= limit) {
console.log(e.charCode)
e.preventDefault();
return false;
}
});
}
}
}]);
We can write the directive to listen to the keypress event. But for some old browsers, this event is not triggered. Thats why i created a directive in such a way that there's no dependency on browser specific events limitation.
I created an angular directive to limit the number of text in the input box.
'use strict';
angular.module("appName")
.directive("limitTo", [function() {
return {
restrict: "A",
require: "ngModel",
link: function(scope, elem, attrs, ctrl) {
var limit = parseInt(attrs.limitTo);
ctrl.$parsers.push(function (value) {
if (value.length > limit){
value = value.substr(0, limit);
ctrl.$setViewValue(value);
ctrl.$render();
}
return value;
});
}
}}]);
Usage: <input limit-to="3" ng-model="test"/> would allow only 3 characters in input box.
In Angular Js Material we can limit input field by "maxLimit", for example we need limit of input text should b 60 character as:
maxLimit ='60'
complete code:
<form-input-field flex
class="input-style-1"
title="Quick response tag title"
placeholder="Write a catchy title to help users get more information on the service card"
form-name="parent.qrtForm"
show-error="showError"
name="title"
maxLength="65"
text-limit="65"
required="true"
ng-model="newQrt.tagName">
Run this operation on any change to the number:
var log = Math.log(number) / Math.log(10);
if (log >= 4)
number = Math.floor(number / Math.pow(10, Math.ceil(log - 4)));
This will always limit "number" to 4 digits.
Angular material has a directive mdMaxlength, if you want to cut off the input at this length, you can use this directive:
app.directive("forceMaxlength", [function() {
return {
restrict: "A",
link: function(scope, elem, attrs) {
var limit = parseInt(attrs.mdMaxlength);
angular.element(elem).on("keydown", function() {
if (this.value.length >= limit) {
this.value = this.value.substr(0,limit-1);
return false;
}
});
}
}
}]);
Usage:
<input type="text" md-maxlength="30" force-maxlength=""/>
I am reiterating what @Danilo Kobold said.
I had to make sure that users can enter only numbers (0-9) [Without 'e' or '.' or '-'] and a limit of 4 values only.
app.directive("limitTo", [function() {
return {
restrict: "A",
link: function(scope, elem, attrs) {
var limit = parseInt(attrs.limitTo);
var exclude = /Backspace|Enter/;
angular.element(elem).on("keydown", function(e) {
if (event.keyCode > 47 && event.keyCode < 58) {
if (this.value.length == limit) e.preventDefault();
} else if (!exclude.test(event.key)) {
e.preventDefault();
}
});
}
}
}]);
If you want to use only limit then use
app.directive("limitTo", [function() {
return {
restrict: "A",
link: function(scope, elem, attrs) {
var limit = parseInt(attrs.limitTo);
var exclude = /Backspace|Enter/;
angular.element(elem).on("keydown", function(e) {
if (!exclude.test(event.key)) {
if (this.value.length == limit) e.preventDefault();
}
});
}
}
}]);
You can add more keys if you want to the exclude variable, like this:
var exclude = /Backspace|Enter|Tab|Delete|Del|ArrowUp|Up|ArrowDown|Down|ArrowLeft|Left|ArrowRight|Right/;
Got idea from this post
Hope I helped someone.
You can just use
ui-mask="9999"
as attribute in your view.
**
app.directive("limitTo", [function() {
return {
restrict: "A",
link: function(scope, elem, attrs) {
var limit = parseInt(attrs.limitTo);
var exclude = /Backspace|Enter/;
angular.element(elem).on("keydown", function(e) {
if (e.keyCode > 47 && e.keyCode < 58) {
if (this.value.length == limit) e.preventDefault();
} else if (!exclude.test(e.key)) {
e.preventDefault();
}
});
}
}
}]);
**
Use this directive if you want to restrict max length for a input field which is present as part of custom directive template. This is the native html5 way of restricting max-lenth. This will also handle the copy paste case also to restrict till the maxlength on pasting.
app.directive('inputWrapper', function() {
return {
restrict: 'A',
template: "<input type='text'/>"
};
});
app.directive('maxInputLength', function() {
return {
restrict: 'A',
link: function(scope, elem, attrs) {
var limit = parseInt(attrs.maxInputLength);
angular.element(elem).find('input').attr('maxlength', limit);
}
};
});<input-wrapper max-input-lenth="35"></input-wrapper>
