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ASP. NET JS get control ID

Source: Internet
Author: User
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Take the text box as an example: First, no master page is used

JS can be in the form of document.getElementById (' control's ID ') or document.getElementById (' <%= control's Id.clientid%> '), the code is as follows:

1"Server">2<title></title>3<script type="Text/javascript">4 function Change () {5             varControl = document.getElementById ('TextBox1');6             //or the following way.7             //var control = document.getElementById (' <%=textbox1.clientid%> ');8             if(Control.value! ="") {9Alert"the text entered:"+control.value);Ten             } One         } A</script> - -<body> the<form id="Form1"runat="Server"> -<div> -<asp:textbox id="TextBox1"runat="Server"Onblur="Change ()"></asp:TextBox> -</div> +</form> -</body>

In the case of HTML <input> tags, the way the ID is obtained and the server control obtains the ID, the code is as follows:

1"Server">2<title></title>3<script type="Text/javascript">4 function Change () {5             varControl = document.getElementById ('Text1');6             if(Control.value! ="") {7Alert"the text entered:"+control.value);8             }9         }Ten</script> One A<body> -<form id="Form1"runat="Server"> -<div> the<input id="Text1"Type="text"Onblur="Change ()"/> -</div> -</form> -</body>

Note: Use the HTML <input> tag to get its value in the background (string text = this.) Text1.value;), or in JS with document.getElementById (' <%=text1.clientid%> '), the form of getting the control ID, need to become a server control, plus runat= "Server", That is <input id= "Text1" type= "text" runat= "server" onblur= "Change ()" >, of course, even with runat= "server", JS can also use document.getElementById (' Text1 '); get its ID.

Second, use master page

① for standard server controls, such as <ASP:TEXTBOX>,JS, you must use document.getElementById (' <%=textbox1.clientid%> ') to get its control ID, and get its ID. The code is as follows:

1<asp:content id="Content1"Contentplaceholderid="Head"runat="Server">2<script type="Text/javascript">3 function Change () {4         //var control = document.getElementById (' TextBox1 ');//the TextBox1 object was not found5         varControl = document.getElementById ('Textbox1.clientid');6         if(Control.value! ="") {7Alert"the text is:"+control.value);8         }9     }Ten</script> One</asp:Content> A<asp:content id="Content2"Contentplaceholderid="ContentPlaceHolder1"runat="Server"> -<asp:textbox id="TextBox1"runat="Server"Onblur="Change ()"></asp:TextBox> -</asp:Content>

If you use document.getElementById (' TextBox1 '), the following error occurs:

② for HTML <input> tags, if you have runat= "server" as a server control, JS gets its ID using document.getElementById (' <%=text1.clientid%> ' ); If not as a server control, use document.getElementById (' Text1 '); get its ID. Otherwise the error will also occur, the code is as follows:

1<asp:content id="Content1"Contentplaceholderid="Head"runat="Server">2<script type="Text/javascript">3 function Change () {4         varControl = document.getElementById ('Text1.clientid');//get its ID as a server control5         //var control = document.getElementById (' Tex2 ');//as an HTML <input> tag, get its ID6         if(Control.value! ="") {7Alert"the text is:"+control.value);8         }9     }Ten</script> One</asp:Content> A<asp:content id="Content2"Contentplaceholderid="ContentPlaceHolder1"runat="Server"> -<input id="Text1"Type="text"runat="Server"Onblur="Change ()"/> -<%--<input id="Text2"Type="text"Onblur="Change ()"/>--%> the</asp:Content>

Note: If you want to get its text value in the background, you must use it as a server control, plus runat= "Server"

③ for server Controls , if you add clientidmode= "Static" property to the ContentPlaceHolder control inside the master page body , The content page JS gets the server control ID can be used directly with its ID name (without using the <%= control Id.clientid%>), the master page code is as follows:

1"Server">2<title></title>3<asp:contentplaceholder id="Head"runat="Server">4</asp:ContentPlaceHolder>56<body>7<form id="Form1"runat="Server">8<div>9<asp:contentplaceholder id="ContentPlaceHolder1"runat="Server"Clientidmode="Static">Ten          One</asp:ContentPlaceHolder> A</div> -</form> -</body>

The content page code is as follows:

1<asp:content id="Content1"Contentplaceholderid="Head"runat="Server">2<script type="Text/javascript">3 function Change (ID) {4         varControl =document.getElementById (ID);5         if(Control.value! ="") {6Alert"the text is:"+control.value);7         }8     }9</script>Ten</asp:Content> One<asp:content id="Content2"Contentplaceholderid="ContentPlaceHolder1"runat="Server"> A<input id="Text1"Type="text"runat="Server"Onblur="Change (this.id)"/><br/> -<asp:textbox id="TextBox1"runat="Server"Onblur="Change (this.id)"></asp:TextBox> -</asp:Content>

ASP. NET JS get control ID

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