为什么在键入textarea时收到替换函数错误

时间:2015-03-11 14:37:50

标签: javascript jquery asp.net updatepanel

我有两个单独的jquery弹出窗口,其中一个是从GridView数据中填充的:

//THIS IS THE POPUP WHICH PRE POPULATES THE TEXTAREA VALUE FROM THE GRIDVIEW
<asp:UpdatePanel runat="server" ID="upPop" UpdateMode="Conditional">
    <ContentTemplate>
        <div id="popupContactEM">
            <a id="popupContactCloseEM" title="Close Window">x</a>
            <div id="dvFourthEM" class="mainFirst">
                <div id="leftdiv1EM" class="leftdivspec"><sup style="color: #FF0000; font-weight: bold;">*</sup>Message:<br /><br /><b style="font-size: xx-small;">Character Count: </b><input maxlength="4" size="4" id="charCountE" style="border: none; font-size: xx-small; color: #E55302;" disabled="disabled" /><br /><b style="font-size: xx-small;">Word Count: </b><input maxlength="4" size="4" style="border: none; font-size: xx-small; color: #E55302;" id="wordCountE" disabled="disabled" /></div>
                <div id="rightdiv1EM" class="rightdivspec"><asp:TextBox ID="tbMessageEM" ClientIDMode="Static" runat="server" TextMode="MultiLine" Columns="30" Rows="5"></asp:TextBox></div>
            </div>
        </div>
        <div id="backgroundPopupEM"></div>
    </ContentTemplate>
</asp:UpdatePanel>

<div id="popupContact">
    <a id="popupContactClose" title="Close Window">x</a>
    <div id="dvFourth" class="mainFirst">
        <div id="leftdiv1" class="leftdivspec"><sup style="color: #FF0000; font-weight: bold;">*</sup>Message:<br /><br /><b style="font-size: xx-small;">Character Count: </b><input maxlength="4" size="4" id="charCount" style="border: none; font-size: xx-small; color: #E55302;" disabled="disabled" /><br /><b style="font-size: xx-small;">Word Count: </b><input maxlength="4" size="4" style="border: none; font-size: xx-small; color: #E55302;" id="wordCount" disabled="disabled" /></div>
        <div id="rightdiv1" class="rightdivspec"><asp:TextBox ID="tbMessage" ClientIDMode="Static" runat="server" TextMode="MultiLine" Columns="30" Rows="5"></asp:TextBox></div>
    </div>
</div>
<div id="backgroundPopup"></div>

我正在尝试显示弹出窗口的WORD和CHARACTER计数,并且我有以下JQuery:

$(document).ready(function () {
    $("#tbMessage").keyup(function () {
        WordCounter(this, 0);
    });

    $("body").on('keyup', "#tbMessageEM", function (e) {
        WordCounter(this, 1);
    });
});

function WordCounter(txt, whc) {

    if (whc == 0) {
        s = txt.value;
    }
    else {
        s = txt;
    }
    if (s.length == 0) {
        len = 0;
    }
    else {
        m1 = s.replace(/\s/g, '+');
        m = m1.replace(/^\s/g, '+');
        len = countWords(m);
    }
    if (whc == 0) {
        document.getElementById("charCount").value = s.length;
        document.getElementById("wordCount").value = len;
    }
    else {
        document.getElementById("charCountE").value = s.length;
        document.getElementById("wordCountE").value = len;
    }

}
function countWords(str) {

    str1 = str.replace(/\+*$/gi, "");
    str2 = str1.replace(/\++/g, ' ');
    var temp = new Array();
    temp = str2.split(' ');
    return temp.length;
}

当未预先填充的弹出窗口打开时,我可以在TextArea内输入文本,它会给我计算。

当打开预填充的弹出窗口时,它确实会从TextArea内的文本中提供单词/字符数,但当我输入或删除任何内容时,我会收到以下错误:0x800a01b6 - JavaScript runtime error: Object doesn't support property or method 'replace'

enter image description here

请帮我解决错误。

2 个答案:

答案 0 :(得分:4)

我很确定这是罪魁祸首:

if (whc == 0) {
    s = txt.value;
}
else {
    s = txt;//This is a Node object
}
...
m1 = s.replace(/\s/g, '+');

您有时会尝试从不存在的HTML元素对象中获取.replace

编辑: 我不完全确定你希望在这里实现什么。最明显的解决方法是确保使用字符串,以避免在节点对象上调用.replace,在if语句中添加另一个检查:

if (!s.replace || s.length == 0) {

尽管如此,这可能仍然缺少s可能应该以字符串开头的基本问题。

答案 1 :(得分:0)

txt即将出现[object HTML TextAreaElement]

我将代码更改为:

if (whc == 0) {
    s = txt.value;
}
else {
    s = $("#tbMessageEM").val();;
}

我没有获得txt,而是获得了textarea的价值,而且工作正常。

为什么它不起作用

对于预先填充的textarea,我正在以这种方式加载弹出窗口:

function loadPopupEM() {
    //loads popup only if it is disabled
    if (popupStatusEM == 0) {
        $("#backgroundPopupEM").css({
            "opacity": "0.7"
        });
        $("#backgroundPopupEM").fadeIn("slow");
        $("#popupContactEM").fadeIn("slow");
        popupStatusEM = 1;
        var w = $("#tbMessageEM").val(); //get the prepopulated text
        WordCounter(w, 1);
    }
}

当加载弹出窗口时,我在行if (s.length == 0)中收到以下错误:

0x800a138f - JavaScript runtime error: Unable to get property 'length' of undefined or null reference