jQuery小功能总结

var count; //当文档树加载完毕执行操作 $(document).ready(function(){ //计算可输入的字符剩余数，textbox将英文，中文都认为是暂1位 $("#txtAskTitle").keyup(function(){ var currentLength = $("#txtAskTitle").val().length; $("#askLastLeng").text(250-currentLength); }).change(function(){ var currentLength = $("#txtAskTitle").val().length; $("#askLastLeng").text(250-currentLength); }); //限制最多只能选中5个标签 $(":checkbox").click(function(){ count = 0; var checkboxs = $(":checkbox"); for(i = 0;i<checkboxs.length;i++) { if(checkboxs[i].checked) { count += 1; } if(count > 5) { this.checked = false; //错误提示框淡入淡出效果 $("#errorMsg").fadeIn("slow",function(){ setTimeout(function(){ $("#errorMsg").fadeOut("slow",0.0); }, 2000) }); break; } } }); }); //验证表单是否通过(有无空缺必填项^-^) function isValidation() { if($.trim($("#txtAskTitle").val()) != "" && count > 0) { return true; } else { alert("*号必填"); return false; } }

 

//动态设置边框高度 var picinfos = $(".ask_que_left_picinfo"); var alls = $(".ask_que_all"); for(i = 0;i<picinfos.length;i++) { picinfos[i].style.height = alls[i].scrollHeight - 30 + "px"; }