一、Form实现Ajax提交表单
function xxx() {
var opts = {
url : '/xxx.do',
type : 'post',
dataType : 'json',
success : function(data) {
}
}
$("#jvForm").ajaxSubmit(opts);
}
二、刷新表格,动态加载css样式
js中动态拼接div,会有不能加载样式的问题
for (i = 0; i < gaozhong.length; i++) {
var v = '<li id="'+gaozhong[i].id+'" class="myli">'+gaozhong[i].title+'</li>';
$("#high").append(v);
}
//在使用'ul'标签时才使用,作用:刷新列表,重新加载所在标签的样式
$("ul").listview("refresh");
$("ul").trigger("create");
三、js获取url中get提交的参数
function getRequest() {
var url = location.search; // 获取url中"?"符后的字串
return url;
}
四、ajax的multipart/form-data方式上传数据
canvas上传图片:
function file_update(){
var dataurl = canvas.toDataURL('image/png'); //base64图片数据
var arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1],
bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
while(n--){
u8arr[n] = bstr.charCodeAt(n);
}
var obj = new Blob([u8arr], {type:mime});
var fd = new FormData();
fd.append("upfile", obj,"image.png"); //文件流
fd.append("url", url);//普通参数
$.ajax({
url: "/pingdian/rest/uploadService/teaComPic",
type: "POST",
processData: false,
contentType: false,
data: fd,
success: function (data) {
window.close();
},
error: function() {
alert("加载失败");
}
});
}
五、textarea自适应高度
$.each($("textarea"), function(i, n){
autoTextarea($(n)[0]);
});
function autoTextarea(elem, extra, maxHeight) {
extra = extra || 0;
var isFirefox = !!document.getBoxObjectFor || 'mozInnerScreenX' in window,
isOpera = !!window.opera && !!window.opera.toString().indexOf('Opera'),
addEvent = function (type, callback) {
elem.addEventListener ?
elem.addEventListener(type, callback, false) :
elem.attachEvent('on' + type, callback);
},
getStyle = elem.currentStyle ?
function (name) {
var val = elem.currentStyle[name];
if (name === 'height' && val.search(/px/i) !== 1) {
var rect = elem.getBoundingClientRect();
return rect.bottom - rect.top -
parseFloat(getStyle('paddingTop')) -
parseFloat(getStyle('paddingBottom')) + 'px';
};
return val;
} : function (name) {
return getComputedStyle(elem, null)[name];
},
minHeight = parseFloat(getStyle('height'));
elem.style.resize = 'none';//如果不希望使用者可以自由的伸展textarea的高宽可以设置其他值
var change = function () {
var scrollTop, height,
padding = 0,
style = elem.style;
if (elem._length === elem.value.length) return;
elem._length = elem.value.length;
if (!isFirefox && !isOpera) {
padding = parseInt(getStyle('paddingTop')) + parseInt(getStyle('paddingBottom'));
};
scrollTop = document.body.scrollTop || document.documentElement.scrollTop;
elem.style.height = minHeight + 'px';
if (elem.scrollHeight > minHeight) {
if (maxHeight && elem.scrollHeight > maxHeight) {
height = maxHeight - padding;
style.overflowY = 'auto';
} else {
height = elem.scrollHeight - padding;
style.overflowY = 'hidden';
};
style.height = height + extra + 'px';
scrollTop += parseInt(style.height) - elem.currHeight;
document.body.scrollTop = scrollTop;
document.documentElement.scrollTop = scrollTop;
elem.currHeight = parseInt(style.height);
};
};
addEvent('propertychange', change);
addEvent('input', change);
addEvent('focus', change);
change();
};