javascript 中未定义 null 或对象错误
我是 mvc 2.0，因为在特定的文本框中设置了文本框的最大字符...但似乎出现未定义的错误这是我的观点
<td>
<%= Html.TextArea("Description", Model.Description, new{id = "descriptionId",onKeyDown = "limitText(this.form.Description,this.form.countdown,1000);",onKeyUp = "limitText(this.form.Description,this.form.countdown,1000);"})%>
</td>
这是我的脚本...
function limitText(limitField, limitCount, limitNum) {
if (limitField.value.length > limitNum) {
limitField.value = limitField.value.substring(0, limitNum);
} else {
limitCount.value = limitNum - limitField.value.length;
alert(limitCount.value);
}
}
I am mvc 2.0 for that in a particular textbox have set the maximun charcter for the textbox...but seems to get undefined error this is my view
<td>
<%= Html.TextArea("Description", Model.Description, new{id = "descriptionId",onKeyDown = "limitText(this.form.Description,this.form.countdown,1000);",onKeyUp = "limitText(this.form.Description,this.form.countdown,1000);"})%>
</td>
This is my script....
function limitText(limitField, limitCount, limitNum) {
if (limitField.value.length > limitNum) {
limitField.value = limitField.value.substring(0, limitNum);
} else {
limitCount.value = limitNum - limitField.value.length;
alert(limitCount.value);
}
}
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看起来您可能将 ASP.NET 控件 ID 与 JavaScript ID 混淆了。在 HTML 源输出中查找该描述文本框的 ID 值，并在当前拥有 this.form.Description 的位置使用该值。它最终可能会是 this.form.DescriptionId 或 this.form.DescriptionId_ctl0 或 ASP.NET 决定为您生成的其他一些可笑的 ID。
Looks like you might have ASP.NET control IDs confused with JavaScript IDs. Look in the HTML source output for the ID value on that description text box and use that where you currently have this.form.Description. It will probably end up as this.form.DescriptionId or this.form.DescriptionId_ctl0 or some other ridiculous ID that ASP.NET decides to generate for you.