[英]delete characters in textarea after 5th line
我需要在textarea中第5行之后的每個字符都將被刪除的功能,並且第5行最多只能包含15個字符。
我可以使用“插入符”來實現這一點,但是它只會在特定的光標位置添加文本,即時消息使用kepress事件和setinterval(textarea的onFocus)函數,該函數將從textarea中清除多余的文本,而clearInterval(textarea的onBlur)
function insertTextAtCaret(el, text)
{
var val = el.value, endIndex, range;
if (typeof el.selectionStart != "undefined" && typeof el.selectionEnd != "undefined") {
endIndex = el.selectionEnd;
el.value = val.slice(0, endIndex) + text + val.slice(endIndex);
el.selectionStart = el.selectionEnd = endIndex + text.length;
} else if (typeof document.selection != "undefined" && typeof document.selection.createRange != "undefined") {
el.focus();
range = document.selection.createRange();
range.collapse(false);
range.text = text;
range.select();
}
}
function charCountTextarea(textAreaId,e,limit,lineLen)
{
var code = e.charCode || e.keyCode;
newLines = $("#"+textAreaId).val().split("\n").length;
var t = $("#"+textAreaId)[0];
var lineIndex = t.value.substr(0, t.selectionStart).split("\n").length-1;
console.log('val t :'+$("#"+textAreaId).val()+' line index : '+lineIndex+' new lines '+newLines);
if(lineIndex == 10 && $("#"+textAreaId).val().split("\n")[lineIndex].length>(lineLen+1) && code!=8 && code!=46 && code!=33 && code!=34 && code!=35 && code!=36 && code!=37 && code!=38 && code!=39 && code!=40)
{
$("#"+textAreaId).val(($("#"+textAreaId).val()).substring(0, $("#"+textAreaId).val().length - 1));
alert('You are reached to limit');
return false;
}
if(lineIndex<5)
{
$("#"+textAreaId).val($("#"+textAreaId).val().wordWrap(lineLen, "\n", 0));
}
var countLine1 = $("#"+textAreaId).val().split("\n")[0].length;
if($("#"+textAreaId).val().split("\n")[lineIndex].length>lineLen) // which will count the total line char condition
{
console.log("In condition : ");
if(code!=8 && code!=46 && code!=33 && code!=34 && code!=35 && code!=36 && code!=37 && code!=38 && code!=39 && code!=40)
{
// to insert next line
insertTextAtCaret(document.getElementById(textAreaId), "\n");
}
}
}
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