在文本框中超过最大位数后显示离子弹出

Question

I'm currently working on a basic calculator using Ionic1 and AngularJS. I want to limit the number of digits inputted on the screen to only 15digits. I want to show an ionic popup to the user. I am using numeric key(buttons) for inputting numbers in my calculator. How can I do that?

Answer 1

您可以在控制器中使用ng-change并发送ng-model值，在控制器中检查输入的长度是否等于15，您可以显示弹出窗口

Answer 2

You can watch your model value using $scope.$watch .

view.html

<input type="text" ng-model="inputValue">

controller.js

$scope.$watch('inputValue', function(newValue, oldValue) {
    if(newValue.length === 15) {
        showPopup(); // your function to show popup
    }
});

Answer 3

HTML:

<input type="input" id="myinput1" value="0" size="15" maxlength="15" />

JS:

$(document).ready(function(){
    $('[id^=myinput1]').keypress(validateNumber);
});
$( "#myinput1" ).on('input', function() {
    if ($(this).val().length>=15) {
        alert('show pop up');       
    }
});
function validateNumber(event) {
    var key = window.event ? event.keyCode : event.which;
    if (event.keyCode === 8 || event.keyCode === 46) {
        return true;
    } else if ( key < 48 || key > 57 ) {
        return false;
    } else {
        return true;
    }
};

JSFiddle Demo