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我需要使用有序列表文本實現文本區域。我已經完成但行號必須是遞增只有在回車鍵被按下。textarea內部的排序列表(行號)
這裏是我的努力:Js Fiddle
代碼
var lineObjOffsetTop = 2;
createTextAreaWithLines('codeTextarea');
function createTextAreaWithLines(id)
{
var el = document.createElement('DIV');
var ta = document.getElementById(id);
ta.parentNode.insertBefore(el,ta);
el.appendChild(ta);
el.className='textAreaWithLines';
el.style.width = (ta.offsetWidth + 30) + 'px';
ta.style.position = 'absolute';
ta.style.left = '30px';
el.style.height = (ta.offsetHeight + 2) + 'px';
el.style.overflow='hidden';
el.style.position = 'relative';
el.style.width = (ta.offsetWidth + 30) + 'px';
var lineObj = document.createElement('DIV');
lineObj.style.position = 'absolute';
lineObj.style.top = lineObjOffsetTop + 'px';
lineObj.style.left = '0px';
lineObj.style.width = '27px';
el.insertBefore(lineObj,ta);
lineObj.style.textAlign = 'right';
lineObj.className='lineObj';
var string = '';
for(var no=1;no<200;no++){
if(string.length>0)string = string + '<br>';
string = string + no;
}
ta.onkeydown = function() { positionLineObj(lineObj,ta); };
ta.onmousedown = function() { positionLineObj(lineObj,ta); };
ta.onscroll = function() { positionLineObj(lineObj,ta); };
ta.onblur = function() { positionLineObj(lineObj,ta); };
ta.onfocus = function() { positionLineObj(lineObj,ta); };
ta.onmouseover = function() { positionLineObj(lineObj,ta); };
lineObj.innerHTML = string;
}
function positionLineObj(obj,ta)
{
obj.style.top = (ta.scrollTop * -1 + lineObjOffsetTop) + 'px';
}
可能不會重新發明輪子並使用像YUI這樣強大的功能:http://yuilibrary.com/yui/docs/editor/ –
我編輯了我的問題。請考慮重新開放。 – Janty
我已經做了一個rnd並再次發佈需求作爲 – Janty