onclick | 易学教程

HTML 中表单form 的相关知识

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在Javascript 中，页面上的每一对<form> 标记都解析为一个对象，即form 对象。可以通过document.forms 获取以源顺序排列的文档中所有form 对象的集合。如果一个表单对象定义如下： < form name = " frm1 " method = " post " action = " login.aspx " > 获得该表单对象的方法： i> document.forms["frm1"]; // 根据name属性值 ii> document.forms[0]; // 根据索引号 iii> document.frm1; // 直接根据name值获得对象 form 表单应该注意的属性： elements：获取以源顺序排列的给定表单中所有控件的集合。但是<input type="image" > 对象不在此集合内。 var txtName = myform . elements [ 0 ] ; // 获得表单的第一个元素 var txtName = myform . elements [ " txtName " ] ; // 获得name属性值为"txtName"的元素 var txtName = myform . elements . txtName ; // 获得name属性值为"txtName"的元素 enctype：

Image is not displayed when parent image is clicked

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问题 Functionality: When user enters the first page, the primary images are randomised and displayed. Therefore, when user clicks on the primary image (1st image), a secondary image (a 2nd image) will be displayed. The secondary image is an extension to the 1st image, therefore, for e.g, when a user clicks on the 1st image of an apple, the second image of a worm is displayed. What I have done: I have set both the 1st images and 2nd images into a set of an array. Secondly, the array of 1st image is

Read and display the text file contents upon click of button using javascript

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问题 On click of a button called "result", I want to read and display a text file (which is present in my local drive location say: C:\test.txt ) using java script function and display the test.txt file contents in a HTML text area. I am new to java script,can anyone suggest the code for java script function to read and display the contents of .txt file ? Thanks and regards Deb 回答1: An Ajax request to a local file will fail for security reasons. Imagine a website that accesses a file on your

get OnClick() from programmatically added buttons?

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问题 i have added some button in a layout: LinearLayout row = (LinearLayout)findViewById(R.id.KeysList); keys=db.getKeys(console); my_button=new Button[keys.size()]; for (bt=0;bt<keys.size();bt++){ my_button[bt]=new Button(this); my_button[bt].setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.FILL_PARENT)); my_button[bt].setText(keys.get(bt)); my_button[bt].setId(bt); row.addView(my_button[bt]); my_button[bt].setOnClickListener(new View.OnClickListener() { @Override public

add value to form array on click

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问题 I have the below code working onclick. <form action="" name="testform" method="post" id="testform"> <input type="hidden" value="" name="a"> <input type="hidden" value="" name="b"> <input type="hidden" value="" name="c"> <select> <option value=""></option> <option value="" onclick="document.testform.a.value='12'; document.testform.b.value='111'; document.testform.c.value='123'">1</option> <option value="" onclick="document.testform.a.value='21'; document.testform.b.value='222'; document

Problems with asp:Button OnClick event

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问题 Here is my button <asp:Button ID="myButton" Text="Click Me" OnClick="doSomething(10)" runat="server" /> Here is the server function public void doSomething(int num) { int someOtherNum = 10 + num; } When I try to compile the code I get the error "Method Name Expected" for the line: <asp:Button ID="myButton" Text="Click Me" OnClick="doSomething(10)" runat="server" /> What am I doing wrong? Am I not allowed to pass values to the server from an OnClick event? 回答1: There are two problems here.

How would I set an ImageButton to change only when my finger is touching it

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问题 I want to create an event to change what my image button looks like, but only when it is being pushed down. So far I have been using an onTouch listener, but that just changes it permanently. I can't find anything like an onKyeUpListener() type of thing for the button. Does anything like this exist? SOLVED final ImageButton button = (ImageButton) findViewById(R.id.ImageButton01); button.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event)

onClick event doesn't work inside form tag

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问题 <!DOCTYPE html> <html> <head> </head> <script> function removeP2() { var parent = document.getElementById("section"); var child = document.getElementById("p2"); parent.removeChild(child); } </script> <body> <nav> <form> <button onclick="removeP2();">Remove</button> </form> </nav> <section id="section"> <p id="p1">Paragraph One.</p> <p id="p2">Paragraph Two.</p> </section> </body> </html> When I click the submit button, the function executes as usual, but after the function executes, the page

Using “onmouseover” to display a tooltip in JavaScript

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问题 I'm trying to use JavaScript to create small dialogue boxes which will advise the user how to enter data into a field when they hover over them. I'm extremely new to using JavaScript so I could be going about this completely the wrong way. Below is my code: <html> <head> <style type="text/css"> #button { border-radius: 50%; border: 1px solid black; padding-top: 3px; padding-bottom: 3px; } #info { margin-left: 5%; } #help_container { border: 0.5px solid black; background-color: #efefef; width:

Android unable to find my onClick method

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问题 I am having an issue where my Button (id i_am_a_problem ) which is declared in the fragment's layout XML, is generating an error when the button is clicked. Android tries to call the onClick method public void calculate(View v) but is unable to find it (despite it being declared in MainActivity). Details of my code are below, and the error is after that. Please help me determine why android is unable to find the onClick method. Thanks. There is really not anything else going on in this code