使用jquery的一些总结

1,使用jquery获取文本框的值
var abcdefg=$(“#text12”);
方式一:abcdefg[0].value
方式二:abcdefg.val()
注意:abcdefg.attr(“value”)获取的是默认值,而不是当前文本框的值

2,使用jquery设置为只读
方式一:

$(‘#mechCoupon\\.startNo‘)[0].readOnly="true";
                $(‘#mechCoupon\\.endNo‘)[0].readOnly="true";

方式二:

var name22=$(‘#text1‘)
name22.attr("readonly",true)
name22.prop("readonly",true)//prop也可以

3,jquery 选中checkbox

$(‘#checkbox222‘).attr("checked",true);

取消选中

$(‘#checkbox222‘).attr("checked",false);

4,jquery获取元素的data-url属性的值

var videoUrl = that.data(‘url‘);

同理,获取data-id的值

var videoUrl = that.data(‘id‘);

5,jquery 查询天气预报

var weather_baidu_url = ‘http://api.map.baidu.com/telematics/v3/weather‘;
var ak_baidu = ‘qG49xeEochXpAp1WDVzD6wA7‘;
var weather_query = function (self) {
    var $thisForm = com.whuang.hsj.getForm(self);
    var $city = $thisForm.find("input[type=text]");
    if ($city == ‘‘) {
        alert("请输入城市");
        return;
    }
    var cityVal = $city.val();
    var weather_query_url = weather_baidu_url + ‘?location=‘ + cityVal + ‘&output=json&ak=‘ + ak_baidu;
    var $result_weather_panel = $(‘#result_weather_panel‘);
    $.jsonP({
        url: weather_query_url, success: function (data) {
            var htmlFragment = null;
            if (data && data.status == ‘success‘) {
                var results = data.results[0];
                var currentDate = data.date;
                var weather_data = results.weather_data;
                var currentCity = results.currentCity;
                $result_weather_panel.find((‘h1‘)).html(currentCity + ‘<span style="font-weight: normal;font-size: initial;" >(PM2.5:‘ + results.pm25 + ‘)</span>‘);
                var html = [];
                var length = weather_data.length;
                html.push(getWeatherResultFirstItem(weather_data[0]));
                for (var i = 1; i < length; i++) {
                    html.push(getWeatherResultListItem(weather_data[i]));
                }
                htmlFragment = html.join(‘‘);
                $.ui.loadContent(‘#result_weather_panel‘, false, false, ‘slide‘);

            } else {
                alert(‘没有查询到天气信息‘);
                return;
            }
            $result_weather_panel.find("ul.list").html(htmlFragment);
            user.log(‘weather:‘+cityVal);
        }
    });
};