I have a form on my page that is located in a class .class-lesson. The form itself only contains text field and radio buttons. I do not know how many of each are in the form since it is dynamically generated by PHP. Each new input in the form is named q1, q2, ... qn.
I am trying to get all the values, whether answered or not, and stored into a javascript array. This is my code so far:
// get the value of each input field
var numQuestions = $(".class-lesson label").not(".csubmit").length;
// store each answer
for (var i = 0; i < numQuestions; i++) {
// store our variables
var tempAnswer = undefined;
var tempReference = $(":input[name=q"+(i+1)+"]");
// loop through each item
if ( tempReference.attr('type') == 'radio' ) tempAnswer = $(":input[name=q"+(i+1)+"]:checked").val();
else tempAnswer = tempReference.val();
// output / store the item
alert( tempAnswer );
}
I am sure there has to be an easier way to do this but I don't know. This is why I am asking. If I don't have the :checked then it will just grab the first value of the radio group.
So, how can I make this more efficient?
To get an entire <form> (or any set of inputs) in serialized form, as it would be if submitted to the server normally (without any JavaScript involved), use .serialize(), like this:
var formData = $(".class-lesson :input").serialize();
//or...
var formData = $("#formID").serialize();
If you're submitting via AJAX for example this makes your code incredibly simple, for example:
$.post("test.php", $("#formID").serialize(), function(data) {
alert("Response was: " + data);
});
Related
I'm new to coding, and I need to display past search values from an input field using localstorage. The only way I can think of is by using one object key with an array of stored values from an on click event. Problem is, I can only get one position to appear as a value, with each value generated replacing the last. I've tried for loops and can't seem to get it to work. This is the code I have so far:
$('.search-city').on('click', function(e){
e.preventDefault();
var textArr = [];
var text = $(".form-control").val();
textArr.push(text);
localStorage.setItem("value1", textArr);
});
$('.search-city').on('click', function(e){
e.preventDefault();
var search = localStorage.getItem("value1")
This would work:
$('.search-city').on('click', function(e){
e.preventDefault();
// get the value from local storage
var localValue = localStorage.getItem('value1');
// if we had a value, parse it back to an array, if we dont, create an empty array
var textArr = localValue ? JSON.parse(localValue) : [];
// get the text from the search input, dont use "form-control"
// you're likely to have several of those on the page
// give the element a custom class like "search-input" and use that (id would be even better)
var text = $('.search-input').val();
// add the text to the array
text = trim(text);
if (text) {
textArr.push(text);
}
// enforce a size limit here by removing the 0 index item if the count has grown too large
var maxAllowed = 10;
while (textArr.length > maxAllowed) {
textArr.shift();
}
// localstorage can only hold simple strings so we'll JSON stringify our object and store that
localValue = JSON.stringify(textArr);
localStorage.setItem("value1", localValue);
});
I have a signup form which is having some 12 fields. I want to validate data in those fields. First step is to check if any field is empty. One way of doing this is to get each field using Jquery and check if it is empty. I was planning to create a var array and check status of each field inside a loop using this code :
var input = new Array();
input[0] = $('.fullName')[0];
input[1] = $('.emailID')[1];
input[2] = $('.phno')[2];
input[3] = $('.userName')[3];
input[4] = $('.password')[4];
input[5] = $('.batch')[5];
input[6] = $('.nickname')[6]
input[7] = $('.enrno')[7];
input[8] = $('.dob')[8];
input[9] = $('.fromCity')[9];
input[10] = $('.currcity')[10];
input[11] = $('.interests')[11];
input[12] = $('.currComp')[12];
input[13] = $('.currDesig')[13];
Now I have to run a loop to get the values and check if any field is blank.
I am writing this code for checking
for(i=0;i<14;i++)
if(input[i].val()=="")
{
// do my work
}
But the problem is that the last 15 lines of code are pointing to actual HTML DOM element, so I can't use input[i].val() directly to access the value. Any way out?
You seriously need to just add a common class to the elements that needs validation, and then do
var is_valid = $('.validate_these').filter(function() {
return $.trim(this.value) === "";
}).length === 0;
That gets all the elements with that class, and filters them based on wether or not the value is empty. If no empty elements where found, it's valid
I have a number of checkboxes that are generated from a JavaScript API call from a database. I need to be able to pass the values of the checkboxes which are then selected by the user, and sent to the processing page. The issue is that the checkboxes don't have ID's associated with them(or this wouldn't be a problem) They all have the same name, but no ID's.
What is the best way to find which check boxes are selected, and pass their values to the following page?
One way I started was with an array:
var options = ["option1","option2","option3"];
var option 1 = [0];
var option 2 = [1];
var option 3 = [2];
On the processing page, using:
var option1 = getFromRequest('option1') || '';
var option2 = getFromRequest('option2') || '';
var option3 = getFromRequest('option3') || '';
Is there a better way of doing this?
I've changed the implementation to the following:
var values = []
$("input:checkbox.subIndustry").each(function(){
values.push(this.value);
});
passing the values to the success page with
window.location.href = REGISTER_SUCCESS +'&values='values.join(",")
which should then get the value with
var variablname = getFromRequest('values') || "";
This is returning Undefined. Any help?
An easy way to select them would be something like $("input[type=checkbox]:checked")
However, if you wanted to keep up with them as they are checked, even if they are added after you load, you could create a variable, then asign a delegation to the "change" state of each input that is a checkbox and update this variable on each change.
It's as simple as:
var checked, checkedValues = new Array();
$(function() {
$(document).on("change", "input[type=checkbox]", function(e) {
checked = $("input[type=checkbox]:checked");
// if you wanted to get an array of values of the checked elements
checkedValues = checked.map(function(i) { return $(this).val() }).get();
// make a string of the values as simple as joining an array!
var str = checkedValues.join(); // would return something like: value1,value2,ext...
});
})
Working Example
Since all your checkboxes have the same name, you can retrieve the checked ones using a variation of:
var checked = $('input[name=ckboxname]:checked');
see: :checked selector for more information
you can simply get the values of checked checkboxes by using
$('input[name=checkboxname]:checked').val();
this will give you the value of checkbox which is checked and for all values simply use
each function of jquery.
Turns out, the answer was to utilize indexOf in the underscore.js library. The solution had to be applied in the API being used to send data.
(_.indexOf(values, '9') != -1 ? 1 : '0'),
I have a php-site with a form on which i output preselected values via php. On form submit I want to check which values have changed and just submit these via javascript.
These are the preselected values I passed over from php. It's important that I keep the associative array structure.
var pbData = jQuery.parseJSON("{
"GameMode":"DEATHMATCH",
"Current Map":"VEGAS JUNKYARD",
"Current Missions":["VEGAS JUNKYARD","VILLA","PRESIDIO","KILL HOUSE","MURDERTOWN","CQB TRAINING","STREETS","THREE KINGDOMS CASINO","IMPORT\/EXPORT;"],
"RoundDuration":"3 minutes"}");
I marked the error in the code.
<script>
function displayVars(){
var form = document.getElementById('settings');
var elems = form.elements;
var txt = "";
for (var index = 0; index < elems.length; index++){
var selIndex = elems[index].selectedIndex;
if (typeof selIndex !== "undefined"){
//the Index Name in the json-object and the name of the form-field are the same
var idxName = elems[index].name;
//HERE is the problem. I want to access the subobject via a variablename, so i can iterate through it, but that doesnt work.
console.log ("pbData default = "+pbData.idxName); //always undefined
if (elems[index].value !== pbData.idx_name){
//building a POST-Url
txt = txt + elems[index].name + "=" + elems[index].options[selIndex].value+"&";
}
}
}
console.log (txt);
return false;
}
</script>
I know that I could do this differently, also with jQuery. In my case as I have the preselected values as a php-variable in any case, i think it's easier like this.
I would really like to know how I can iterate through the subobjects via a variable that contains the object names.
This is due to how you'e trying to access the property of the (JSON) object. Consider
var o1 = {idxName: true},
o2 = {foo : 'bar'},
idxName = 'foo';
o1.idxName; // true
o2.idxName; // undefined
o2[idxName]; // 'bar'
You need to access the property via pbData[idxName].
Additionally, you're not escaping quotes in your JSON string, and line breaks need to be escaped as follows
var pbData = jQuery.parseJSON("{\
\"GameMode\":\"DEATHMATCH\",\
\"Current Map\":\"VEGAS JUNKYARD\",\
\"Current Missions\":[\"VEGAS JUNKYARD\",\"VILLA\",\"PRESIDIO\",\"KILL HOUSE\",\"MURDERTOWN\",\"CQB TRAINING\",\"STREETS\",\"THREE KINGDOMS CASINO\",\"IMPORT\/EXPORT;\"],\
\"RoundDuration\":\"3 minutes\"}");
In Javascript you could keep an object or array with initial values and only post those values that are changed.
But in fact, I would do something similar, but in PHP. You can keep the original values in the session and compare the posted values to those initial values to see what has changed. That way, you won't depend on Javascript. Not only may Javascript be disabled, but also, a fast user may theoretically post the form before the Javascript has run. To move this check to PHP eliminates that risk.
I have a form that currently only parses the first input variable in the POST.
I have had to add multiple variables, so I would like the function to loop through and grab all the input parameters and add to the POST
Here's the working code for grabbing the first name and value.... How can I get it to check the form and grab all custom name's and variables.
example here
// dynamically add key/value pair to POST body
function read_custom_param(){
var nameEl = document.getElementById("custom_name");
var valueEl = document.getElementById("custom_value");
// save custom param name and value
var cust_param_name = nameEl.value;
var cust_param_value = valueEl.value;
// remove old custom param form elements
if (valueEl.parentNode && valueEl.parentNode.removeChild){
valueEl.parentNode.removeChild(valueEl);
}
if (nameEl.parentNode && nameEl.parentNode.removeChild){
nameEl.parentNode.removeChild(nameEl);
}
// add new custom param form elements
var el=document.createElement("input");
el.type="text";
el.name=cust_param_name;
el.value=cust_param_value;
document.getElementById("dcapiform").appendChild(el);
}
Kind Regards,
Chris
for whatever purpose ur trying to send ambiguous field names to the server, here is what ur looking for (u should consider a smarter way, may br processing on the server side instead)
var elems = document.getElementsByTagName("input");
var arr = [];
for (var i = 0; i<elems.length; i++){
if (elems[i].type != "text") continue;
if (elems[i].name.indexOf("custom_name") < 0) continue;
var index = parseInt(elems[i].name.substring(11)); // you should rename custom_name to custom_name1, and so for custom_value
arr[arr.length] = elems[i].value+"=" + elems["custom_value"+index].value;
}
document.forms[0]["passedITems"] = arr.join(",");
docmentt.forms[0].submit();
on your server side, read "passedItems", and split by ",", you get an array of "name=value", split again on "=" you get a sub array of name, and value