如何从 jquery 文件访问母版页文本框？
在我的母版页中，我有一个文本框。
<asp:TextBox ID="SearchTextBox" runat="server" class="searchtxtbox" onfocus="HideSearchWaterMark();" Text="Search" onblur="ShowSearchWaterMark(this);" />
我在代码后面添加了 jquery 引用。
TextBox SearchTextBox = this.FindControl("SearchTextBox") as TextBox;
StringBuilder objStringBuilder = new StringBuilder();
objStringBuilder.Append("<script type=\"text/javascript\" language=\"javascript\">\n");
objStringBuilder.AppendFormat("var searchTextBox = '{0}';\n", SearchTextBox.ClientID);
objStringBuilder.Append("</script>\n");
this.Page.ClientScript.RegisterClientScriptBlock(GetType(), "RegisterVariables", objStringBuilder.ToString());
this.Page.ClientScript.RegisterClientScriptInclude(this.GetType(), "Global", this.ResolveClientUrl("~/Resources/Scripts/Search.js"));
this.Page.ClientScript.RegisterClientScriptInclude(this.GetType(), "Global", this.ResolveClientUrl("~/Resources/Scripts/jquery-1.4.2.js"));
this.Page.ClientScript.RegisterClientScriptInclude(this.GetType(), "Global", this.ResolveClientUrl("~/Resources/TagsScripts/jquery.autocomplete.js"));
在 Search.js 中，我有以下方法来访问文本框母版页：
$(document).ready(function () {
$("#" + searchTextBox).autocomplete("Handlers/GenericHandler.ashx?tgt=12", {
multiple: true,
multipleSeparator: ";",
mustMatch: false,
autoFill: true
});
});
function HideSearchWaterMark() {
var control = $("#" + searchTextBox);
if (control[0].className == "searchtxtbox ac_input")
control[0].value = "";
control[0].className = "searchtxtbox ac_input";
}
function ShowSearchWaterMark(tagsTextBox) {
if (searchTextBox.value.length == 0) {
searchTextBox.value = "Search";
searchTextBox.className = "searchtxtbox ac_input";
}
当我运行我的应用程序时，我收到对象引用未设置错误。
请告诉我哪里需要更改我的代码。
In my master page i've a textbox.
<asp:TextBox ID="SearchTextBox" runat="server" class="searchtxtbox" onfocus="HideSearchWaterMark();" Text="Search" onblur="ShowSearchWaterMark(this);" />
I added jquery references in code behind.
TextBox SearchTextBox = this.FindControl("SearchTextBox") as TextBox;
StringBuilder objStringBuilder = new StringBuilder();
objStringBuilder.Append("<script type=\"text/javascript\" language=\"javascript\">\n");
objStringBuilder.AppendFormat("var searchTextBox = '{0}';\n", SearchTextBox.ClientID);
objStringBuilder.Append("</script>\n");
this.Page.ClientScript.RegisterClientScriptBlock(GetType(), "RegisterVariables", objStringBuilder.ToString());
this.Page.ClientScript.RegisterClientScriptInclude(this.GetType(), "Global", this.ResolveClientUrl("~/Resources/Scripts/Search.js"));
this.Page.ClientScript.RegisterClientScriptInclude(this.GetType(), "Global", this.ResolveClientUrl("~/Resources/Scripts/jquery-1.4.2.js"));
this.Page.ClientScript.RegisterClientScriptInclude(this.GetType(), "Global", this.ResolveClientUrl("~/Resources/TagsScripts/jquery.autocomplete.js"));
in Search.js i've the following methods to access the text box of master page:
$(document).ready(function () {
$("#" + searchTextBox).autocomplete("Handlers/GenericHandler.ashx?tgt=12", {
multiple: true,
multipleSeparator: ";",
mustMatch: false,
autoFill: true
});
});
function HideSearchWaterMark() {
var control = $("#" + searchTextBox);
if (control[0].className == "searchtxtbox ac_input")
control[0].value = "";
control[0].className = "searchtxtbox ac_input";
}
function ShowSearchWaterMark(tagsTextBox) {
if (searchTextBox.value.length == 0) {
searchTextBox.value = "Search";
searchTextBox.className = "searchtxtbox ac_input";
}
When i run my application i'm getting object reference not set error.
Please tell me where i need to change my code.
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为了使用 id 选择器访问元素，在命名容器内您必须使用 ClientID，而在 js 文件中您将无法使用它。因此最好尝试使用类名来获取元素，例如
Inorder to access an element using id selector, inside a naming container you have to use ClientID and in a js file you won't be able to use that. So better try to get the element using the class name, something like
您需要在母版页上调用FindControl：
看看这里
You need to call FindControl on the Master page :
Have a look here
要使用 id 选择器访问元素，在命名容器内您必须使用 ClientID，而在 js 文件中您将无法使用它。因此，最好尝试使用类名来获取元素，例如
$("input:text.searchtxtbox")
链接
norder to access an element using id selector, inside a naming container you have to use ClientID and in a js file you won't be able to use that. So better try to get the element using the class name, something like
$("input:text.searchtxtbox")
link