我能得到什么信息 [英] what i could get information
问题描述
我可以从javascript中的html获取信息吗?
例如我想从语言为asp.net c#
的文本框中的html获取数据
< head>
< javascript language ="javascript">
/*我想获得名称为txtdata的控制信息*/
</head>
< asp:textbox id ="txtdata" runat ="server"/>
what i could get information from html in javascript?
for example i want get data from html in textbox of language asp.net c#
<head>
<javascript language="javascript">
/*i want get information in control by name txtdata */
</head>
<asp:textbox id="txtdata" runat="server" />
推荐答案
在Javascript中尝试此操作
try this in Javascript
<html>
<head>
var textBoxvalue = document.getElementById("txtdata");
</head>
<body>
<asp:textbox id="txtdata" runat="server" xmlns:asp="#unknown" />
</body>
</body></html>
这是JavaScript的主要目的之一.例如，可以使用getElementById获取输入控制对象，然后使用其属性value.在输入文本的情况下，它将是文本框中的文本.请参阅:
http://www.tizag.com/javascriptT/javascript-getelementbyid.php [ ^ ]，
http://www.w3schools.com/tags/tag_input.asp [ http://www.w3schools.com/jsref/default.asp [ http://www.w3schools.com/jsref/dom_obj_document.asp [ http://en.wikipedia.org/wiki/Jquery [ http://jquery.com/ [ ^ ].
例如，这等效于getElementById:
This is one of main purposes of JavaScript. For example, you can get an input control object usinggetElementByIdand then use its propertyvalue. In case of text input, it will be the text in the text box. Please see:
http://www.tizag.com/javascriptT/javascript-getelementbyid.php[^],
http://www.w3schools.com/tags/tag_input.asp[^].
Starting from any element, you can also get the whole DOM model of the whole document of its part. Please start here:
http://www.w3schools.com/jsref/default.asp[^],
http://www.w3schools.com/jsref/dom_obj_document.asp[^].
It''s more convenient to work with HTML DOM elements using jQuery:
http://en.wikipedia.org/wiki/Jquery[^],
http://jquery.com/[^].
For example, this is the equivalent ofgetElementById:
inputElement =
(" )； // 元素包装器，如果元素具有属性id ="myTextBox" ，则由id选择器找到 值= inputElement.val(); // 使用此包装器
("#myTextBox"); // element wrapper, found by the id selector, if the element has the attribute id="myTextBox" value = inputElement.val(); // use this wrapper
请参见:
http://api.jquery.com/id-selector/ [ http://api.jquery.com/category/selectors/ [ http://api.jquery.com/val/ [ http://api.jquery.com/category/traversing/ [ http://docs.jquery.com/Tutorials [ http://docs.jquery.com/Tutorials:How_jQuery_Works [
Please see:
http://api.jquery.com/id-selector/[^],
http://api.jquery.com/category/selectors/[^],
http://api.jquery.com/val/[^].
Major DOM navigation is done using traversing methods:
http://api.jquery.com/category/traversing/[^].
If you need to learn jQuery, start here:
http://docs.jquery.com/Tutorials[^],
http://docs.jquery.com/Tutorials:How_jQuery_Works[^].
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