www.gusucode.com > 一个基于extjs的强大聊天插件源码程序 > 一个基于extjs的强大聊天插件/extjame/ext-jame/js/ext2/source/util/Format.js
/*
* Ext JS Library 2.0.2
* Copyright(c) 2006-2008, Ext JS, LLC.
* licensing@extjs.com
*
* http://extjs.com/license
*/
/**
* @class Ext.util.Format
* Reusable data formatting functions
* @singleton
*/
Ext.util.Format = function(){
var trimRe = /^\s+|\s+$/g;
return {
/**
* Truncate a string and add an ellipsis ('...') to the end if it exceeds the specified length
* @param {String} value The string to truncate
* @param {Number} length The maximum length to allow before truncating
* @return {String} The converted text
*/
ellipsis : function(value, len){
if(value && value.length > len){
return value.substr(0, len-3)+"...";
}
return value;
},
/**
* Checks a reference and converts it to empty string if it is undefined
* @param {Mixed} value Reference to check
* @return {Mixed} Empty string if converted, otherwise the original value
*/
undef : function(value){
return value !== undefined ? value : "";
},
/**
* Checks a reference and converts it to the default value if it's empty
* @param {Mixed} value Reference to check
* @param {String} defaultValue The value to insert of it's undefined (defaults to "")
* @return {String}
*/
defaultValue : function(value, defaultValue){
return value !== undefined && value !== '' ? value : defaultValue;
},
/**
* Convert certain characters (&, <, >, and ') to their HTML character equivalents for literal display in web pages.
* @param {String} value The string to encode
* @return {String} The encoded text
*/
htmlEncode : function(value){
return !value ? value : String(value).replace(/&/g, "&").replace(/>/g, ">").replace(/</g, "<").replace(/"/g, """);
},
/**
* Convert certain characters (&, <, >, and ') from their HTML character equivalents.
* @param {String} value The string to decode
* @return {String} The decoded text
*/
htmlDecode : function(value){
return !value ? value : String(value).replace(/&/g, "&").replace(/>/g, ">").replace(/</g, "<").replace(/"/g, '"');
},
/**
* Trims any whitespace from either side of a string
* @param {String} value The text to trim
* @return {String} The trimmed text
*/
trim : function(value){
return String(value).replace(trimRe, "");
},
/**
* Returns a substring from within an original string
* @param {String} value The original text
* @param {Number} start The start index of the substring
* @param {Number} length The length of the substring
* @return {String} The substring
*/
substr : function(value, start, length){
return String(value).substr(start, length);
},
/**
* Converts a string to all lower case letters
* @param {String} value The text to convert
* @return {String} The converted text
*/
lowercase : function(value){
return String(value).toLowerCase();
},
/**
* Converts a string to all upper case letters
* @param {String} value The text to convert
* @return {String} The converted text
*/
uppercase : function(value){
return String(value).toUpperCase();
},
/**
* Converts the first character only of a string to upper case
* @param {String} value The text to convert
* @return {String} The converted text
*/
capitalize : function(value){
return !value ? value : value.charAt(0).toUpperCase() + value.substr(1).toLowerCase();
},
// private
call : function(value, fn){
if(arguments.length > 2){
var args = Array.prototype.slice.call(arguments, 2);
args.unshift(value);
return eval(fn).apply(window, args);
}else{
return eval(fn).call(window, value);
}
},
/**
* Format a number as US currency
* @param {Number/String} value The numeric value to format
* @return {String} The formatted currency string
*/
usMoney : function(v){
v = (Math.round((v-0)*100))/100;
v = (v == Math.floor(v)) ? v + ".00" : ((v*10 == Math.floor(v*10)) ? v + "0" : v);
v = String(v);
var ps = v.split('.');
var whole = ps[0];
var sub = ps[1] ? '.'+ ps[1] : '.00';
var r = /(\d+)(\d{3})/;
while (r.test(whole)) {
whole = whole.replace(r, '$1' + ',' + '$2');
}
v = whole + sub;
if(v.charAt(0) == '-'){
return '-$' + v.substr(1);
}
return "$" + v;
},
/**
* Parse a value into a formatted date using the specified format pattern.
* @param {Mixed} value The value to format
* @param {String} format (optional) Any valid date format string (defaults to 'm/d/Y')
* @return {String} The formatted date string
*/
date : function(v, format){
if(!v){
return "";
}
if(!Ext.isDate(v)){
v = new Date(Date.parse(v));
}
return v.dateFormat(format || "m/d/Y");
},
/**
* Returns a date rendering function that can be reused to apply a date format multiple times efficiently
* @param {String} format Any valid date format string
* @return {Function} The date formatting function
*/
dateRenderer : function(format){
return function(v){
return Ext.util.Format.date(v, format);
};
},
// private
stripTagsRE : /<\/?[^>]+>/gi,
/**
* Strips all HTML tags
* @param {Mixed} value The text from which to strip tags
* @return {String} The stripped text
*/
stripTags : function(v){
return !v ? v : String(v).replace(this.stripTagsRE, "");
},
stripScriptsRe : /(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)/ig,
/**
* Strips all script tags
* @param {Mixed} value The text from which to strip script tags
* @return {String} The stripped text
*/
stripScripts : function(v){
return !v ? v : String(v).replace(this.stripScriptsRe, "");
},
/**
* Simple format for a file size (xxx bytes, xxx KB, xxx MB)
* @param {Number/String} size The numeric value to format
* @return {String} The formatted file size
*/
fileSize : function(size){
if(size < 1024) {
return size + " bytes";
} else if(size < 1048576) {
return (Math.round(((size*10) / 1024))/10) + " KB";
} else {
return (Math.round(((size*10) / 1048576))/10) + " MB";
}
},
math : function(){
var fns = {};
return function(v, a){
if(!fns[a]){
fns[a] = new Function('v', 'return v ' + a + ';');
}
return fns[a](v);
}
}()
};
}();