[英]Why am I receiving a typescript error when migrating a Paho MQTT function from Angular 1 to Angular 2?
[英]Why am I receiving a replace function error when typing into a textarea
我有兩個單獨的jquery彈出窗口,其中一個是從GridView
數據填充的:
//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>
我試圖顯示兩個彈出窗口的WORD和CHARACTER計數,並且我有以下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;
}
當未預填充的彈出窗口打開時,我可以在TextArea
輸入文本,它可以計數。
當預填充的彈出窗口打開時,它確實提供了TextArea
內文本的單詞/字符計數,但是當我輸入或刪除任何內容時,出現以下錯誤: 0x800a01b6 - JavaScript runtime error: Object doesn't support property or method 'replace'
:
請幫助我解決錯誤。
我可以肯定這是罪魁禍首:
if (whc == 0) {
s = txt.value;
}
else {
s = txt;//This is a Node object
}
...
m1 = s.replace(/\s/g, '+');
有時您試圖從不存在的HTML元素對象中獲取.replace
。
編輯:我不完全確定您希望在這里實現什么。 最明顯的解決方法是確保您正在使用字符串,因此為避免在節點對象上調用.replace
,請在if
語句中添加另一個檢查:
if (!s.replace || s.length == 0) {
雖然,這可能仍然缺少深層的問題s
或許應該開始與一個字符串。
txt
即將出現[object HTML TextAreaElement]
。
我將代碼更改為此:
if (whc == 0) {
s = txt.value;
}
else {
s = $("#tbMessageEM").val();;
}
我沒有得到txt
,而是得到了textarea的值,並且可以正常工作。
為什么它不起作用 :
對於預填充的textarea,我以這種方式加載彈出窗口:
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);
}
}
加載彈出窗口時, if (s.length == 0)
在行中出現以下錯誤:
0x800a138f - JavaScript runtime error: Unable to get property 'length' of undefined or null reference
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