javascript清除输入框中的数据_表单特效



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function fillInMessageArea(othis){
var text = othis.parentNode.childNodes[0].firstChild.nodeValue;
text = '回复' + text;
text += ':';
var me_area = $('#message_area');
me_area.val("");
me_area.val(text);
setFocus();
}
function clearAll(){
var me_area = $('#message_area');
var input = document.getElementById('input_rewrite');
if(me_area.attr('class') == 'not_write') return false;
var text = me_area.val();
text= text.replace(/(^\S+(:)+?)(\s*.+\s*)+/,"$1");
if(!text.match(/(.*?):/))
me_area.val("");
else
me_area.val(text);
setFocus();
hide_rewrite(input);
}
function rewrite(){
var me_area = $('#message_area');
var text = me_area.val();
var input = document.getElementById('input_rewrite');
if(text.match(/^\S+(:)+?(\s*.+\s*)+/) ||(!text.match(/(.*?):/)))
show_rewrite(input);
//input.value= "not null";
else
hide_rewrite(input);
if(text=='')
hide_rewrite(input);
//input.value = "null";
//alert('null');
}
function show_rewrite(input){
input.className = "can_rewrite";
}
function hide_rewrite(input){
input.className = "not_write";
}
function setFocus(){
esrc = document.getElementById('message_area');
//esrc.focus();
var rtextRange = "";
if(esrc.createTextRange){
rtextRange = esrc.createTextRange();
rtextRange.moveStart('character',esrc.value.length);
rtextRange.collapse(true);
rtextRange.select();
}
}