IE下支持文本框和密碼框placeholder效果的JQuery插件

基於jQuery實現的,主要用於IE下實現placeholder效果,可同時支持文本和密碼輸入框。placeholder是HTML5新增的一個屬性,當input設置了該屬性後,該值的內容將做爲灰色提示顯示在文本框中,當文本框得到焦點時,提示文字消失。javascript

 

實現代碼以下: html


(function($) {
  /**
   * 沒有開花的樹
   * 2012/11/28 15:12
   */

 

  var placeholderfriend = {
    focus: function(s) {
      s = $(s).hide().prev().show().focus();
      var idValue = s.attr("id");
      if (idValue) {
        s.attr("id", idValue.replace("placeholderfriend", ""));
      }
      var clsValue = s.attr("class");
   if (clsValue) {
        s.attr("class", clsValue.replace("placeholderfriend", ""));
      }
    }
  }java

  //判斷是否支持placeholder
  function isPlaceholer() {
    var input = document.createElement('input');
    return "placeholder" in input;
  }
  //不支持的代碼
  if (!isPlaceholer()) {
    $(function() {jquery

      var form = $(this);ide

      //遍歷全部文本框,添加placeholder模擬事件
      var elements = form.find("input[type='text'][placeholder]");
      elements.each(function() {
        var s = $(this);
        var pValue = s.attr("placeholder");
  var sValue = s.val();
        if (pValue) {
          if (sValue == '') {
            s.val(pValue);
          }
        }
      });this

      elements.focus(function() {
        var s = $(this);
        var pValue = s.attr("placeholder");
  var sValue = s.val();
        if (sValue && pValue) {
          if (sValue == pValue) {
            s.val('');
          }
        }
      });code

      elements.blur(function() {
        var s = $(this);
        var pValue = s.attr("placeholder");
  var sValue = s.val();
        if (!sValue) {
          s.val(pValue);
        }
      });orm

      //遍歷全部密碼框,添加placeholder模擬事件
      var elementsPass = form.find("input[type='password'][placeholder]");
      elementsPass.each(function(i) {
        var s = $(this);
        var pValue = s.attr("placeholder");
  var sValue = s.val();
        if (pValue) {
          if (sValue == '') {
            //DOM不支持type的修改,須要複製密碼框屬性,生成新的DOM
            var html = this.outerHTML || "";
            html = html.replace(/\s*type=(['"])?password\1/gi, " type=text placeholderfriend")
              .replace(/\s*(?:value|on[a-z]+|name)(=(['"])?\S*\1)?/gi, " ")
              .replace(/\s*placeholderfriend/, " placeholderfriend value='" + pValue
              + "' " + "onfocus='placeholderfriendfocus(this);' ");
            var idValue = s.attr("id");
            if (idValue) {
              s.attr("id", idValue + "placeholderfriend");
            }
            var clsValue = s.attr("class");
   if (clsValue) {
              s.attr("class", clsValue + "placeholderfriend");
            }
            s.hide();
            s.after(html);
          }
        }
      });htm

      elementsPass.blur(function() {
        var s = $(this);
        var sValue = s.val();
        if (sValue == '') {
          var idValue = s.attr("id");
          if (idValue) {
            s.attr("id", idValue + "placeholderfriend");
          }
          var clsValue = s.attr("class");
    if (clsValue) {
            s.attr("class", clsValue + "placeholderfriend");
          }
          s.hide().next().show();
        }
      });事件

    });
  }
  window.placeholderfriendfocus = placeholderfriend.focus;
})(jQuery);

 

使用很簡單,html代碼以下:

 

<html> <head> <script src="jquery.js" type="text/javascript"></script> <script src="placeholderfriend.js" type="text/javascript"></script> </head> <body> <input placeholder="帳號/手機號碼" ><br> <input placeholder="密碼" type="password" > </body> </html>
相關文章
相關標籤/搜索