Textarea ---操作
App = {};App.byteLength = function(str) {
if (typeof str == "undefined") {
return 0
}
var aMatch = str.match(/[^\x00-\x80]/g);
return (str.length + (!aMatch ? 0: aMatch.length))
};
App.trim = function(str) {
str= str.replace(/^(\u3000|\s|\t)*/gi, "");
str= str.replace(/(\u3000|\s|\t)*$/gi, "");
return str;
};
App.selectionStart='';
App.currentKey='';
App.TextareaUtils = (function() {
var it = {},
ds = document.selection;
it.selectionStart = function(oElement) {
if (!ds) {
return oElement.selectionStart
}
var er = ds.createRange(),
value,
len,
s = 0;
var er1 = document.body.createTextRange();
er1.moveToElementText(oElement);
for (s; er1.compareEndPoints("StartToStart", er) < 0; s++) {
er1.moveStart("character", 1)
}
return s
};
it.selectionBefore = function(oElement) {
return oElement.value.slice(0, it.selectionStart(oElement))
};
it.selectText = function(oElement, nStart, nEnd) {
oElement.focus();
if (!ds) {
oElement.setSelectionRange(nStart, nEnd);
return
}
var c = oElement.createTextRange();
c.collapse(1);
c.moveStart("character", nStart);
c.moveEnd("character", nEnd - nStart);
c.select()
};
it.insertText = function(oElement, sInsertText) {
nStart = App.selectionStart;
nLen = App.currentKey.length;
oElement.focus();
nLen = nLen || 0;
if (!ds) {
var text = oElement.value,
start = nStart - nLen,
end = start + sInsertText.length;
oElement.value = text.slice(0, start) + sInsertText + text.slice(nStart, text.length);
it.selectText(oElement, end, end);
return
}
var c = ds.createRange();
c.moveStart("character", -nLen);
c.text = sInsertText
};
it.getCursorPos = function(obj) {
var CaretPos = 0;
if ($IE) {
obj.focus();
var range = null;
range = ds.createRange();
var stored_range = range.duplicate();
stored_range.moveToElementText(obj);
stored_range.setEndPoint("EndToEnd", range);
obj.selectionStart = stored_range.text.length - range.text.length;
obj.selectionEnd = obj.selectionStart + range.text.length;
CaretPos = obj.selectionStart
} else {
if (obj.selectionStart || obj.selectionStart == "0") {
CaretPos = obj.selectionStart
}
}
return CaretPos
};
it.getSelectedText = function(obj) {
var selectedText = "";
var getSelection = function(e) {
if (e.selectionStart != undefined && e.selectionEnd != undefined) {
return e.value.substring(e.selectionStart, e.selectionEnd)
} else {
return ""
}
};
if (window.getSelection) {
selectedText = getSelection(obj)
} else {
selectedText = ds.createRange().text
}
return selectedText
};
it.setCursor = function(obj, pos, coverlen) {
pos = pos == null ? obj.value.length: pos;
coverlen = coverlen == null ? 0: coverlen;
obj.focus();
if (obj.createTextRange) {
var range = obj.createTextRange();
range.move("character", pos);
range.moveEnd("character", coverlen);
range.select()
} else {
obj.setSelectionRange(pos, pos + coverlen)
}
};
it.unCoverInsertText = function(obj, str, pars) {
pars = (pars == null) ? {}: pars;
pars.rcs = pars.rcs == null ? obj.value.length: pars.rcs * 1;
pars.rccl = pars.rccl == null ? 0: pars.rccl * 1;
var text = obj.value,
fstr = text.slice(0, pars.rcs),
lstr = text.slice(pars.rcs + pars.rccl, text == "" ? 0: text.length);
obj.value = fstr + str + lstr;
this.setCursor(obj, pars.rcs + (str == null ? 0: str.length))
};
return it
})();
App.check = function(current) {
var tu=App.TextareaUtils,reg = /@[^@\s]{1,20}$/g,
value = current.value.replace(/\r/g, ""),
key;
selectionStart = tu.selectionStart(current);
App.selectionStart = selectionStart;
value = value.slice(0, selectionStart);
if ((key = value.match(reg)) && (key = key) && /^@+$/.test(key)) {
key = key.slice(1);
if (App.currentKey == key) {
return '';
}
}else{
key = '';
}
App.currentKey = key;
return key;
};
App.forwardInputLimit = function(current , input) {
var num = Math.ceil(App.byteLength(App.trim(current.value)) / 2);
if (input) {
if (num > 140) {
input.innerHTML = '已经超出<em>'+(num-140)+'</em>字';
return false
} else {
input.innerHTML = '还可以输入<em>'+(140-num)+'</em>字';
return true
}
}
};
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