/*
* 文字截取
* create by:river
* create date ： 2014/08/15
* 文字截取两种方式截取，按字数，按行数
* 分别通过相应自定义属性
* data-textflow-words 字数
* data-textflow-rows 行数
*/
Ymt.add(function (require, exports, module) {
var defOpts = {
defSel: '.textflow',//默认选择
rowNum:3,
ellipsis:"..."//超出替换符号
}
/*
* 字数截取
* @param {objcet} 截取对象
* @param {number} 行数
*/
function wordsIntercept($target, wordsNum) {
$target.each(function () {
})
}
/*
*行高截取
* @param {objcet} 截取对象
* @param {number} 行数
*/
function RowIntercept($target,rowNum) {
$target.each(function () {
var $this = $(this),
clientHeight = this.clientHeight,//容器高度
fontSize = parseFloat($this.css("fontSize")),
lineHeight = parseFloat($this.css("lineHeight"));
var title = $this.attr("title");
//将原来的值保存到title中
if (title === undefined || title === "") {
$this.attr("title", title = $this.text());
}
//将原来的值还原重新计算
$this.text(title);
var dheight = parseInt(rowNum * lineHeight);
if (clientHeight >= dheight) {
while (dheight * 3 < this.clientHeight) {
$this.text(title.substring(0, title.length / 2));
title = $this.text();
}
//减去末尾文字
while (dheight < this.clientHeight) {
title = $this.text();
$this.text(title.replace(/(\s)*([a-zA-Z0-9]?|\W)(\.\.\.)?$/, "..."));
}
}
})
}
/**
* @param {string} 选择器
* @param {string} 子选择器
* 子选择器的目的，在父元素定义自定义属性，所有子选择应用这个选项，就不需要每个标签都去定义截取方式。
* @param {object} 配置项
*/
return function (selector, childer, opts) {
var $target, num, $childer;
opts = opts || defOpts;
//如果没有传入使用默认
if (!arguments.length || typeof arguments[0] !== "string") {
$childer = $target = $(".textflow");
} else {
$childer = $target = $(selector);
}
//判断是否有配置项
if (opts === "objcet") {
opts = $m.merge(defOpts, opts);
}
//判断是否有子项
if (typeof arguments[1] === "string") {
$childer = $target.find(childer);
}
//按行截取大于按字数截取
if (num = $target.attr("data-textflow-rows") || opts.rowNum) {
RowIntercept($childer, num);
return;
}
if (num = $target.attr("data-textflow-words")) {
wordsIntercept($childer, num);
}
}
})
