'tag.htm'; break; case 'flag': $pre .= $default_pre .= 'flag.htm'; break; case 'my': $pre .= $default_pre .= 'my.htm'; break; case 'my_password': $pre .= $default_pre .= 'my_password.htm'; break; case 'my_bind': $pre .= $default_pre .= 'my_bind.htm'; break; case 'my_avatar': $pre .= $default_pre .= 'my_avatar.htm'; break; case 'home_article': $pre .= $default_pre .= 'home_article.htm'; break; case 'home_comment': $pre .= $default_pre .= 'home_comment.htm'; break; case 'user': $pre .= $default_pre .= 'user.htm'; break; case 'user_login': $pre .= $default_pre .= 'user_login.htm'; break; case 'user_create': $pre .= $default_pre .= 'user_create.htm'; break; case 'user_resetpw': $pre .= $default_pre .= 'user_resetpw.htm'; break; case 'user_resetpw_complete': $pre .= $default_pre .= 'user_resetpw_complete.htm'; break; case 'user_comment': $pre .= $default_pre .= 'user_comment.htm'; break; case 'single_page': $pre .= $default_pre .= 'single_page.htm'; break; case 'search': $pre .= $default_pre .= 'search.htm'; break; case 'operate_sticky': $pre .= $default_pre .= 'operate_sticky.htm'; break; case 'operate_close': $pre .= $default_pre .= 'operate_close.htm'; break; case 'operate_delete': $pre .= $default_pre .= 'operate_delete.htm'; break; case 'operate_move': $pre .= $default_pre .= 'operate_move.htm'; break; case '404': $pre .= $default_pre .= '404.htm'; break; case 'read_404': $pre .= $default_pre .= 'read_404.htm'; break; case 'list_404': $pre .= $default_pre .= 'list_404.htm'; break; default: $pre .= $default_pre .= theme_mode_pre(); break; } if ($config['theme']) { $conffile = APP_PATH . 'view/template/' . $config['theme'] . '/conf.json'; $json = is_file($conffile) ? xn_json_decode(file_get_contents($conffile)) : array(); } !empty($json['installed']) and $path_file = APP_PATH . 'view/template/' . $config['theme'] . '/htm/' . ($id ? $id . '_' : '') . $pre; (empty($path_file) || !is_file($path_file)) and $path_file = APP_PATH . 'view/template/' . $config['theme'] . '/htm/' . $pre; if (!empty($config['theme_child']) && is_array($config['theme_child'])) { foreach ($config['theme_child'] as $theme) { if (empty($theme) || is_array($theme)) continue; $path_file = APP_PATH . 'view/template/' . $theme . '/htm/' . ($id ? $id . '_' : '') . $pre; !is_file($path_file) and $path_file = APP_PATH . 'view/template/' . $theme . '/htm/' . $pre; } } !is_file($path_file) and $path_file = APP_PATH . ($dir ? 'plugin/' . $dir . '/view/htm/' : 'view/htm/') . $default_pre; return $path_file; } function theme_mode_pre($type = 0) { global $config; $mode = $config['setting']['website_mode']; $pre = ''; if (1 == $mode) { $pre .= 2 == $type ? 'portal_category.htm' : 'portal.htm'; } elseif (2 == $mode) { $pre .= 2 == $type ? 'flat_category.htm' : 'flat.htm'; } else { $pre .= 2 == $type ? 'index_category.htm' : 'index.htm'; } return $pre; } ?>javascript - increase a hidden input's value based on click of button - Stack Overflow
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javascript - increase a hidden input's value based on click of button - Stack Overflow

programmeradmin8浏览0评论

I have a hidden input #start thats value is used to display a range of returned data (it is the starting point of an index) each time you click #next I need to increase its value.

$("#next").click(function() {
  $("#start").val() + 80;
)};

is this correct? or is there a better way? thx all!

I have a hidden input #start thats value is used to display a range of returned data (it is the starting point of an index) each time you click #next I need to increase its value.

$("#next").click(function() {
  $("#start").val() + 80;
)};

is this correct? or is there a better way? thx all!

Share Improve this question edited Sep 17, 2010 at 20:28 KP. 13.7k3 gold badges42 silver badges60 bronze badges asked Sep 17, 2010 at 20:17 Dirty Bird DesignDirty Bird Design 5,55313 gold badges67 silver badges127 bronze badges 0
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5 Answers 5

Reset to default 6

Try this (demo):

$("#next").click(function() {
  $("#start").val(function(i,v){
   return parseInt(v,10) + 80 || 0;
  });
});

You need to convert the value to an integer, add whatever number to it, and save it back:

$("#next").click(function(){
      var startElement = $("#start");
      var value = parseInt(startElement.val(), 10);
      startElement.val(value + 80);    
});

Working sample: http://jsfiddle/QZgAf/

All you're doing is retrieving val and adding 80 to it, you're not actually setting it back to the value on the element. To do so try the following:

$("#next").click(function() {
  $("#start").val( parseInt($("#start).val()) + 80 );
)};

This is somewhat inefficient though, as you'll be selecting #start twice. Instead I'd cache the #start selection in a variable:

$("#next").click(function() {
  var startElement = $("#start");
  startElement.val( parseInt(startElement.val()) + 80 );
)};

Here's another way. It accesses the value attribute directly and uses ~~ to avoid the possible octal or NaN issues.

$("#next").click(function() {
     var start = document.getElementById("start");
     start.value = ~~start.value + 80;
});

Or better is to only run the selector for #start once if the button could be clicked more than once.

   // cache "start" outside the handler
var start = document.getElementById("start");

$("#next").click(function() {
     start.value = ~~start.value + 80;
});

Use a little closure pattern:

$("#next").click(function cli() {
    var v = 0;

    return function() {
        $("#start").html(v += 80);
    };
}());
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