Question

我有一个特殊的问题..我有一个指令，它只允许输入文本框中的字母。它的工作正常，大部分时间除外。当我尝试编辑字符串的中间部分时，它会进行编辑，但控件会转到字符串的末尾，然后我必须将它放到我想要编辑的字符串位置。 var test ='abcdefg';当我改变除字母“g”之外的任何字母时，光标会移到整个单词的末尾。我想要它是在改变的信之后。任何帮助将不胜感激以下是部分指令代码

link: function (scope, element, attrs, ngModel) {
            if (!ngModel) return;
            ngModel.$parsers.unshift(function (inputValue) {
            var alphas = inputValue.split('').filter(function (s) { return (s.match(/[ A-Za-z\-']/g)); }).join('');
                ngModel.$viewValue = alphas; 
                ngModel.$render();
                return alphas;
            });
        }

Answer 1

Not sure if you've solved your issue, but I had the same issue where every time I deleted a character in the middle of the input, it would skip me to the end of the input.

With regards to your code, I had to do

    //Checks if the setSelectionRange method is available (not IE compatible)
    //Otherwise use createTextRange() (IE compatible)

    scope.setSelectionRange = function (input, selectionStart, selectionEnd) {

      if (input.setSelectionRange) {
        input.focus();
        input.setSelectionRange(selectionStart, selectionEnd);

      } else if (input.createTextRange) {

        var range = input.createTextRange();
        range.collapse(true);
        range.moveEnd("character", selectionEnd);
        range.moveStart("character", selectionStart);
        range.select();

      }

    };

    ngModelCtrl.$parsers.push(function (value) {

      //Get the position the cursor was last at
      var lastLetterPosition = element[0].selectionStart;

      element.val($filter("uppercase")(value));
      value = value.replace(/ /g, "").toLowerCase();

      //I tried to do scope.$apply() to apply the change, but a digest cycle
      //was already in progress, so scope.$evalAsync() adds the
      //change to the end of the current digest cycle instead
      //Manually set the position of the cursor to where the last position was

      scope.$evalAsync(scope.setSelectionRange(htmlElement, lastLetterPosition, lastLetterPosition));

      return value;
    });

Hope that helps!

角度光标定位问题

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