Question

Hi guys I have this script here, which counts the characters and lines, now currently though it still allows lines and characters to go into minus, but I would like it to also put up a warning box so it stops the user from being able to put in more text, could you help me out?

javascript:

function textCounter(theField,theCharCounter,theLineCounter,maxChars,maxLines,maxPerLine) {
    var strTemp = "";
    var strLineCounter = 0;
    var strCharCounter = 0;

    for (var i = 0; i < theField.value.length; i++)
    {
        var strChar = theField.value.substring(i, i + 1);
        if (strChar ==  
 )
        {
            strTemp += strChar;
            strCharCounter = 1;
            strLineCounter += 1;
        }
        else if (strCharCounter == maxPerLine)
        {
            strTemp +=  
  + strChar;
            strCharCounter = 1;
            strLineCounter += 1;
        }
        else
        {
            strTemp += strChar;
            strCharCounter ++;
        }
    }

    theCharCounter.value = maxChars - strTemp.length;
    theLineCounter.value = maxLines - strLineCounter;
}

并用于编码:

<textarea name="comment" cols="50" rows="10" wrap="VIRTUAL" onKeyUp="textCounter(theForm.comment,theForm.remChars,remLines,900,30,50);"></textarea>
<br><input name=remChars type=text value="900" size=3 maxlength=3 readonly> characters left
<br><input name=remLines type=text value="30" size=3 maxlength=3 readonly> lines left<br>

汇报工作

Answer 1

1 - 在职能结束时添加检查:

var check = strTemp.length <= maxChars && strLineCounter <= maxLines;
if (!check) alert("Error message here!");

2 - 附上实地文本,因此只包含所需果园:

theField.value = theField.value.sbustring(0, maxChars - 1);

3 - 恢复职能:

return check ;

4 - 改变对以下事项具有约束力的活动:

onKeyUp="return textCounter(theForm.comment,theForm...

友情链接