Question

我正在尝试使用美国，加拿大（xxx）xxx-xxxx和其他国家/地区的格式预填充电话号码字段为+ xxxxxxx。这里的问题是当我更改国家/地区逻辑似乎不因为Jquery对象保持以前的值，所以正在工作。

$(document).ready(function($) {
  $('#country').on('change', function() {

    if (this.value == 'US' || this.value == 'CA') {

      $('#C_BusPhone')
      .keydown(function(e) {

        var key = e.charCode || e.keyCode || 0;

        $phone = $(this);

        if (key !== 8 && key !== 9) {
          if ($phone.val().length === 4) {
            $phone.val($phone.val() + ')');
          }
          if ($phone.val().length === 5) {
            $phone.val($phone.val() + ' ');
          }
          if ($phone.val().length === 9) {
            $phone.val($phone.val() + '-');
          }
        }
        return (key == 8 ||
          key == 9 ||
          key == 46 ||
          (key >= 48 && key <= 57) ||
          (key >= 96 && key <= 105));
      })

      .bind('focus click', function() {
        $phone = $(this);

        if ($phone.val().length === 0) {
          $phone.val('(');
        } else {
          var val = $phone.val();
          $phone.val('').val(val);
        }
      })

      .blur(function() {
        $phone = $(this);

        if ($phone.val() === '(') {
          $phone.val('');
        }
      });

    } else {

      $('#C_BusPhone')
      .keydown(function(e) {
       if ($(this).val().indexOf("+") === -1) {
          $(this).val("+" + $(this).val());
        }
      })

    }


  });
});

Answer 1

您只是继续添加事件，它们不会被覆盖。因此，您需要手动删除该事件。由于您使用的是- (void) saveImageToFile:(NSString *) urlImg withNameNumber:(int)numberName andQuestionId:(int) questionID { NSString* documentsPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0]; NSString* foofile = [documentsPath stringByAppendingPathComponent:[NSString stringWithFormat:@"gallery%d%d.jpg",numberName,questionID]]; BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:foofile]; if (!fileExists) { NSData *tempImgData = [NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@%@",@"https://testurl/",urlImg]]]; NSString *filename = [NSString stringWithFormat:@"gallery%d%d.jpg",numberName,questionID]; NSString *imagePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:filename]; [tempImgData writeToFile:imagePath atomically:YES]; } } -(UIImage*) readImageFromFile:(int)numberName andQuestionId:(int) questionID { NSString * documentsDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; return [UIImage imageWithContentsOfFile:[NSString stringWithFormat:@"%@/gallery%d%d.jpg",documentsDirectoryPath,numberName,questionID]]; }，因此bind()。

unbind()

请注意，根据official jQuery documentation，使用$('#C_BusPhone').unbind("keydown");和on()的1.7 +优先于off()和bind()。

另一种选择是附加一个事件并在要运行的代码内部进行逻辑检查。

Answer 2

js code：

$(document).ready(function($) {
$('#country').on('change', function() {

  $('#C_BusPhone').val("");
  alert($("#country").val());
});

$('#C_BusPhone').keydown(function(e) {

    var key = e.charCode || e.keyCode || 0;
    var phone = $('#C_BusPhone');

    if ($("#country").val() == 'US' || $("#country").val() == 'CA') {
        console.log($("#country").val());

        if (key !== 8 && key !== 9) {
          if (phone.val().length === 4) {
            phone.val(phone.val() + ')');
          }
          if (phone.val().length === 5) {
            phone.val(phone.val() + ' ');
          }
          if (phone.val().length === 9) {
            phone.val(phone.val() + '-');
          }
        }

       if (phone.val().length === 0) {
          phone.val('(');
       } 
       else {
          var val = phone.val();
          phone.val('').val(val);
       }

     } 
     else {

       if (phone.val().indexOf("+") === -1) {
          phone.val("+" + phone.val());
       }
     }
  });
});

JQuery清除$（this）对象

2 个答案: