第一次写关于AppCan开发的文章,有人写了关于jQuery或者原生Ajax与json的交互,那我就稍微写写我开发过程中使用jQuery获取json后使用zy_tmpl生成下拉菜单的实例吧。
PHP服务端生成json的那部分就不写那么多了,就是输入一个数组$res,然后
echo $_GET['jsoncallback'] . "(" . json_encode($res) . ")";
在AppCan的模版中,先加入一个下拉菜单,我的菜单是:
<!--下拉列表开始--> <div class=" ui-has-label"> <label class="ui-select ">选择楼群:</label> <div class="ui-select"> <div class="ui-btn ui-btn-icon-right ui-btn-corner-all ui-btn-b"> <span class="ui-btn-inner ui-btn-corner-all" > <span class="ui-btn-text">楼名</span> <div class="ui-li-link-alt ui-btn ui-btn-corner-right ui-shadow"> <span class="ui-icon ui-icon-arrow-d ui-icon-shadow"></span> </div> </span> <select name="lc" id="lc" selectedIndex="0" id="select-choice-0" onchange="zy_slectmenu(this.id)"> 数据加载中,请稍候 </select> </div> </div> </div> <!--下拉列表结束-->
然后在中加入:
function getlq(){ $.getJSON('http://localhost/json.php?jsoncallback=?', function(data) { var tmpl='<option value="${BuildingId}">${BuildingName}</option>'; $("#lc").html(""); $("#lc").append(zy_tmpl(tmpl,data,zy_tmpl_count(data))); }) }
这样在onload或者onchange、onclick时执行getlq();就能实现select的更新。
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实现方法:1、用“$("img").delay(毫秒数).fadeOut()”语句,delay()设置延迟秒数;2、用“setTimeout(function(){ $("img").hide(); },毫秒值);”语句,通过定时器来延迟。

区别:1、axios是一个异步请求框架,用于封装底层的XMLHttpRequest,而jquery是一个JavaScript库,只是顺便封装了dom操作;2、axios是基于承诺对象的,可以用承诺对象中的方法,而jquery不基于承诺对象。

修改方法:1、用css()设置新样式,语法“$(元素).css("min-height","新值")”;2、用attr(),通过设置style属性来添加新样式,语法“$(元素).attr("style","min-height:新值")”。

增加元素的方法:1、用append(),语法“$("body").append(新元素)”,可向body内部的末尾处增加元素;2、用prepend(),语法“$("body").prepend(新元素)”,可向body内部的开始处增加元素。

在jquery中,apply()方法用于改变this指向,使用另一个对象替换当前对象,是应用某一对象的一个方法,语法为“apply(thisobj,[argarray])”;参数argarray表示的是以数组的形式进行传递。

删除方法:1、用empty(),语法“$("div").empty();”,可删除所有子节点和内容;2、用children()和remove(),语法“$("div").children().remove();”,只删除子元素,不删除内容。

去掉方法:1、用“$(selector).removeAttr("readonly")”语句删除readonly属性;2、用“$(selector).attr("readonly",false)”将readonly属性的值设置为false。

on()方法有4个参数:1、第一个参数不可省略,规定要从被选元素添加的一个或多个事件或命名空间;2、第二个参数可省略,规定元素的事件处理程序;3、第三个参数可省略,规定传递到函数的额外数据;4、第四个参数可省略,规定当事件发生时运行的函数。


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