The following code checks if a checkbox has been checked var checkBox = $("input[name='myCheckBox']:checked").val(); if(checkBox == 'on'){ alert('CHECKED!!'); }else{ alert('NOT CHECKED'); } myCheckBox is the name of the checkbox element e.g. <input type="checkbox" name="myCheckBox" />
By using the isNaN() JavaScript function. isNaN = Is Not A Number Examples: document.write(isNaN(“Hello World!”)); //Will print true since Hello World! is not a number document.write(isNaN(123456)); //Will print false, since 123456 is a number. var phoneNumber = 0724956785234; if(isNaN(phoneNumber) == true){ alert(“Please enter a valid phone number”); return false; }
This can be achieved by using .length if($("#id_name").length == 0) { //the element with id_name does not exists }
Use the following code withing your JavaScript tags if(jQuery){ alert('jQuery loaded'); }else{ alert('jQuery not loaded'); } This method can be used to check if any other JavaScript variable or function exists or is set and thus is not limited to jQuery alone.
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This can be done using the jQuery length property You will use the following command to determine if there are any options within the select box. var length = $('#selectBoxId > option').length; console.log(length); #selectBoxId should be replaced with the ID of your select box.
var countRows = $('#tableID tr').length; alert(countRows) or var countRows = $('#tableID tr').size; alert(countRows) The selector takes all rows and then counts them.
Use the string.toLowerCase() function as the example below <script type="text/javascript"> var str="I NEED THIS STRING TO BE CONVERTED TO LOWER CASE"; document.write(str.toLowerCase()); </script>
If you have a JSON encoded string that you might have received from a ajax scriptand you need to decode it using JavaScript you can use the eval() function to decode the string. The eval() function evaluates or executes an given argument. Example: var string = '{"id" : 32}'; var d = eval('(' + string + ')'); alert(d.id); //will alert 32
NOTE: Please not that the prop JQuery function should be used instead of the attr function in JQuery 1.6 and higher Answer: To disable all input elements within div use the following code: $(’#message :input’).attr(‘disabled’, true); To disable all select elements within div use the following code: $(’#message :select’).attr(‘disabled’, true); To disable all submit buttons within div use the following code: $("#message :submit").attr(“disabled”, “true”); Explanation: The DIV tags ID is message attr- Access a property on the first matched element. $(“selector”) If disabled is set to false the element won’t be disabled