多选框checkbox: $("#chk1").attr("checked",'');//不打勾 $("#chk2").attr("checked",true);//打勾 if($("#chk1").attr('checked')==undefined) //判断是否已经打勾 单选组radio: $("input[@type=radio]").attr("checked",'2');//设置value=2的项目为当前选中项 下拉框select: $("#...
checked属性是最直接、最常用的方法来判断Checkbox是否被选中。通过获取Checkbox元素,然后检查其checked属性值即可。 实际案例:基础判断 <!DOCTYPEhtml>Checkbox Checked ExampleCheck me!Check if CheckedfunctioncheckCheckbox(){varcheckbox=document.getElementById("myCheckbox");if(checkbox.checked){alert("Checkbox is ...
How to make field required with JavaScript if checkbox is checked March 13, 2015 Really simple solution that will allow you to make fields required below Fields need to be required if checked: document.getElementById("needRequired").addEventListener('change', function(){ document.getElement...
How do you check if an HTML form checkbox field is checked in JavaScript?Craig Buckler
If you're using the compiled (or minified) bootstrap.js, there is no need to include this—it's already there. What's inside Transition.js is a basic helper for transitionEnd events as well as a CSS transition emulator. It's used by the other plugins to check for CSS transition ...
I am looking for a javascript to cause a popup info box IF a checkbox from a radio button is selected. I have a section PDF form that involves how an employee was transported to get medical care. They are given 3 options. There are 3 radio buttons that correspond with th...
Finally, the function is granted to the public domain--use it as you wish. InstructionsProvide the form name and the field name of the checkbox as the parameters to the function. Then specify true or false as the CheckValue, depending on if you want to check or uncheck all the ...
Delay showing and hiding the tooltip (ms) - does not apply to manual trigger type If a number is supplied, delay is applied to both hide/show Object structure is: delay: { "show": 500, "hide": 100 } html boolean false Insert HTML into the tooltip. If false, jQuery's text method ...
4.表单提交(空格提交的问题)例 4.1(form.submitIEFF.html) function check() { var form = document.getElementById("regForm"); if (form.user.value == "") { alert("用户名不能为空!"); } else { form.submit(); } } 用户 <INPUT TYPE="button" onclick="check();" id="regBut...
6/7/01 update: Please see a response to a letter on this article for further details on how to check if there is only ONE checkbox in a set. (For instance, if you are building your set from a table and don't know if there is more than one checkbox in the set or not.)Letters...