21. 替换字符串中的单词
var el = $(‘#id’); el.html(el.html().replace(/word/ig, ”));
22. 关闭右键的菜单
$(document).bind(‘contextmenu’,function(e){ return false; });
23. 定义一个定制的选择器
$.expr[‘:’].mycustomselector = function(element, index, meta, stack){
// element- is a DOM element
// index – the current loop index in stack
// meta – meta data about your selector
// stack – stack of all elements to loop
// Return true to include current element
// Return false to explude current element
};
// Custom Selector usage:
$(‘.someClasses:test’).doSomething();
24. 判断一个元素是否存在
if ($(‘#someDiv’).length) {
//hooray!!! it exists…
}
25. 使用jQuery判断鼠标的左右键点击
$(“#someelement”).live(‘click’, function(e) { if( (!$.browser.msie && e.button == 0) || ($.browser.msie && e.button == 1) ) { alert(“Left Mouse Button Clicked”); } else if(e.button == 2) alert(“Right Mouse Button Clicked”); });
26. 显示或者删除输入框的缺省值
//This snippet will show you how to keep a default value
//in a text input field for when a user hasn’t entered in
//a value to replace it
swap_val = [];
$(“.swap”).each(function(i){ swap_val[i] = $(this).val();
$(this).focusin(function(){ if ($(this).val() == swap_val[i]) { $(this).val(“”); } }).focusout(function(){ if ($.trim($(this).val()) == “”) { $(this).val(swap_val[i]); } }); }); <INPUT value=”Enter Username here..” type=text>
27. 指定时间后自动隐藏或者关闭元素(1.4支持）
//Here’s how we used to do it in 1.3.2 using setTimeout
setTimeout(function() { $(‘.mydiv’).hide(‘blind’, {}, 500) }, 5000);
//And here’s how you can do it with 1.4 using the delay() feature (this is a lot like sleep)
$(“.mydiv”).delay(5000).hide(‘blind’, {}, 500);
28. 动态创建元素到DOM
var newgbin1Div = $(”);
newgbin1Div.attr(‘id’,’gbin1.com’).appendTo(‘body’);
29. 限制textarea的字符数量
jQuery.fn.maxLength = function(max){ this.each(function(){ var type = this.tagName.toLowerCase();
var inputType = this.type? this.type.toLowerCase() : null; if(type == “input” &&
inputType == “text” || inputType == “password”){
//Apply the standard maxLength this.maxLength = max;
} else if(type == “textarea”){ this.onkeypress = function(e){ var ob = e || event;
