115 lines
4.1 KiB
JavaScript
115 lines
4.1 KiB
JavaScript
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//new function() {
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// var _self = this;
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// _self.width = 640; //设置默认最大宽度
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// _self.fontSize = 100; //默认字体大小
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// _self.widthProportion = function() {
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// var p = (document.body &&
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// document.body.clientWidth ||
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// document.getElementsByTagName("html")[0].offsetWidth) / _self.width;
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// return p > 1 ? 1 : p < 0.5 ? 0.5 : p;
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// };
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// _self.changePage = function() {
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// document.getElementsByTagName("html")[0].setAttribute("style", "font-size:" + _self.widthProportion() * _self.fontSize + "px !important");
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// }
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// _self.changePage();
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// window.addEventListener("resize", function() {
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// _self.changePage();
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// }, false);
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//};
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(function () {
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// 手机页面rem适应
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var currClientWidth,
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fontValue,
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originWidth;
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originWidth = 750; //ui设计稿的宽度，一般750或640
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__resize();
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window.addEventListener('resize', __resize, false);
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function __resize() {
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currClientWidth = document.documentElement.clientWidth;
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if (currClientWidth > 768) {
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currClientWidth = 768;
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}
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if (currClientWidth < 320) {
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currClientWidth = 320;
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}
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fontValue = ((625 * currClientWidth) / originWidth).toFixed(2);
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document.documentElement.style.fontSize = fontValue + '%';
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}
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})();
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/**
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* 文本框根据输入内容自适应高度
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* @param {HTMLElement} 输入框元素
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* @param {Number} 设置光标与输入框保持的距离(默认0)
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* @param {Number} 设置最大高度(可选)
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*/
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var autoTextarea = function (elem, extra, maxHeight) {
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extra = extra || 0;
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var isFirefox = !!document.getBoxObjectFor || 'mozInnerScreenX' in window,
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isOpera = !!window.opera && !!window.opera.toString().indexOf('Opera'),
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addEvent = function (type, callback) {
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elem.addEventListener ?
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elem.addEventListener(type, callback, false) :
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elem.attachEvent('on' + type, callback);
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},
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getStyle = elem.currentStyle ? function (name) {
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var val = elem.currentStyle[name];
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if (name === 'height' && val.search(/px/i) !== 1) {
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var rect = elem.getBoundingClientRect();
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return rect.bottom - rect.top -
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parseFloat(getStyle('paddingTop')) -
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parseFloat(getStyle('paddingBottom')) + 'px';
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};
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return val;
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} : function (name) {
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return getComputedStyle(elem, null)[name];
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},
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minHeight = parseFloat(getStyle('height'));
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elem.style.resize = 'none';
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var change = function () {
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var scrollTop, height,
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padding = 0,
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style = elem.style;
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if (elem._length === elem.value.length) return;
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elem._length = elem.value.length;
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if (!isFirefox && !isOpera) {
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padding = parseInt(getStyle('paddingTop')) + parseInt(getStyle('paddingBottom'));
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};
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scrollTop = document.body.scrollTop || document.documentElement.scrollTop;
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elem.style.height = minHeight + 'px';
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if (elem.scrollHeight > minHeight) {
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if (maxHeight && elem.scrollHeight > maxHeight) {
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height = maxHeight - padding;
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style.overflowY = 'auto';
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} else {
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height = elem.scrollHeight - padding;
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style.overflowY = 'hidden';
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};
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style.height = height + extra + 'px';
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scrollTop += parseInt(style.height) - elem.currHeight;
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document.body.scrollTop = scrollTop;
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document.documentElement.scrollTop = scrollTop;
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elem.currHeight = parseInt(style.height);
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};
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};
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addEvent('propertychange', change);
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addEvent('input', change);
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addEvent('focus', change);
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change();
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};
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