I am using the following javascript code to check for nothing being entered in a form and it is not working. Can anyone suggest a reason? function validateForm() { var a=document.getElementById("quiz_01").value; $question = a; if (a=="" || a==null) { alert("Question 201 must ...
validateForm()函数通常用于在提交表单之前验证表单中的输入数据是否符合特定的要求。如果这个函数没有正确执行验证,可能是由于以下几个原因: 基础概念 表单验证:确保用户在提交表单之前输入的数据是有效的,比如必填字段不为空,电子邮件格式正确等。 JavaScript 事件处理:通常会在表单的onsubmit事件中调用validateForm()函数...
}//验证表单所有字段的函数//form参数应是一个表单元素的引用//load参数应该是一个布尔值 用以判别验证函数在页面加载时执行还是动态执行functionvalidateForm(form, load) {varvalid =true;for(vari = 0; i < form.elements.length; i++) {//遍历表单的所有字段的一个数组hideErrors(form.elements[i]);//...
JavaScript to check for, and alert the user to, credit card typos. However, to see whether a credit card has sufficient funds requires communicating with the credit card company and that can only be done using a server side programming language. Similarly, form data is typically saved in a ...
I have created a student form that has 4 to 5 fields. For the contact number, I have 2 fields, country code and phone number. I want to throw an error if the user only inputs one of the two fields ie country code is entered but the phone number isn't or vice-versa. However, ...
I am tyring to create a button using javascript that will do the following: There are 3 signature lines - PO, SPO, Chief. I want the PO line hidden until the button is click and the form is completed. Check to make sure the form is complete All text fields All radio buttons ...
How to Check for Empty Fields Using JavaScriptTo make the web browser check that a field is not empty, you will need to add a call to your validation function when the form is submitted. You do this by adding a "onsubmit" attribute to your FORM tag, like the following (keep it on ...
http://stackoverflow.com/questions/931687/using-jquery-validate-plugin-to-validate-multiple-form-fields-with-identical-nam 具体内容为 $(function () { if ($.validator) { //fix: when several input elements shares the same name, but has different id-ies... $...
validateValue: object[]- optional, the value to be validated. If not specified, the method validates the current value of the control Returns: true, if a control is valid; otherwise,false Example form.getItem("simplevault").validate(true); ...
I need to ensure that all fields representing dates are in the correct date format. If I forget to set a field in the date format, the JavaScript code should display an error message indicating that the field is not set in the correct date format. I have the capability to manually fill...