Develop Reference

Razor JQuery Populate Drop Down from Model array

I am using a WebGrid to allow CRUD on my database (using MVC and EF entities). The grid works and filters they way I want it to. There are two columns that use dropdowns to display a value tied to another table (Projects and People) and these both work well for edits/ updates. I am using JQuery for an add new row and want the new row to have select fields like the grid does (so that the user can just find the person by name instead of having to enter the ID for example). I am referencing this post from another similar question, but when I implement the code I get a syntax error that I'm having trouble understanding.
Here is my scripting on the view side that shows my failed attempt. I'm creating an array from the project repository (Text is the name of the project and Value is the ID field), and populating it with the model values: Model.Projects, and then in the add row function I want to loop through the array to add in the options.
<script type="text/javascript">
var ProjectArray = new Array();
#foreach (var proj in Model.projects)
{
#:ProjectArray.push(Text: "#proj.Text", Value: "#proj.Value");
}
</script>
<script type="text/javascript">
$(function ()
{
$('body').on("click", ".add", function () {
var SelectedProject = "#Model.ProjectID";
var newRow = $('.save').length;
console.log('newRow = ' + newRow);
if (newRow == 0) {
var index = "new"+$("#meetingList tbody tr").length + 1;
var ProjectID = "ProjectID_" + index;
var Date = "Date_" + index;
var Attendees = "Attendees_" + index;
var Phase = "Phase_" + index;
var PeopleID = "PeopleID_" + index;
var Save = "Save _" + index;
var Cancel = "Cancel_" + index;
var tr = '<tr class="alternate-row"><td><span> <input id="' + ProjectID + '" type="select"/></span></td>' +
#* This is where I use the array to add the options to the select box*#
ProjectArray.forEach(function (item) {
if (item.Value == SelectedProject) { '<option selected="selected" value="' + item.Value + '">' + item.Text + '</option>' }
else { '<option value="' + item.Value + '">' + item.Text + '</option>' }
+
});
---remaining script omitted----
'<td><span> <input id="' + PeopleID + '" type="text" /></span></td>' +
'<td><span> <input id="' + Date + '" type="date" /></span></td>' +
'<td><span> <input id="' + Attendees + '" type="text" /></span></td>' +
'<td><span> <input id="' + Phase + '" type="text" /></span></td>' +
'<td> SaveCancel</td>' +
'</tr>';
console.log(tr);
$("#meetingList tbody").append(tr);
}
});
I am not sure how to parse the error, but the page source looks like this when creating my client side array:
var ProjectArray = new Array();
ProjectArray.push(Text: "Select Project", Value: ""); //<-- ERROR HERE:
ProjectArray.push(Text: "010111.00", Value: "74");
ProjectArray.push(Text: "013138.00", Value: "2");
So the model getting into the client side works (the text and value pairs are correct), but the error I get is for the first array.push line: missing ) after the argument list. I have played with moving this code block around, putting it in a separate <script> tag and the error likewise follows it around, always on the first array.push line. And regardless of where it is, the rest of my script functions no longer work. I think it must be something silly but I just am not seeing what I'm doing wrong.
The option list does not populate into something I can ever see, it just renders out on the page source as the javascript loop:
var tr = '<tr class="alternate-row"><td><span> <input id="' + ProjectID + '" type="select"/></span></td>' +
ProjectArray.forEach(function (item) {
if (item.Value == SelectedProject) { '<option selected="selected" value="' + item.Value + '">' + item.Text + '</option>' }
else { '<option value="' + item.Value + '">' + item.Text + '</option>' }
+
}); //-- Unexpected token here
And with the push array in its separate script block I get a second error that the last } is an unexpected token. This is some javascripting error I'm sure. But where it is an how to do this are beyond me right now.

I'm not used to javascript, and poor syntax leads to the vague errors I was getting. The first problem was fixed by adding the { . . . } around the array values. Then I created a function to create the arrays I need for people and projects as well as a function to take an array and create the option list to clean up the view code:
function createProjectArray() {
var ProjectArray = new Array();
#foreach (var proj in Model.projects)
{
if (proj.Value != "") {
#:ProjectArray.push({ Text: "#proj.Text", Value: "#proj.Value" });
}
}
return ProjectArray;
}
function createPeopleArray() {
var PeopleArray = new Array();
#foreach (var person in Model.people)
{
if (person.Value != "") {
#:PeopleArray.push({ Text: "#person.Text", Value: "#person.Value" });
}
}
return PeopleArray;
}
function SelectOptionsString(MyArray, SelectedValue) {
console.log(MyArray);
var OptionsList = "";
MyArray.forEach(item => {
if (item.Value == SelectedValue) { OptionsList += '<option
selected="selected" value="' + item.Value + '">' + item.Text + '</option>'; }
else { OptionsList += '<option value="' + item.Value + '">' + item.Text
+ '</option>'; }
})
return OptionsList;
}
Taking this approach allowed me to more easily parse the code and find the syntax errors. The Array.forEach syntax was an interesting hurdle, and this site helped me test out my syntax to eventually get it working as above.
So the server creates the javascript lines to create the array, and then I use the array to create my dropdown options list. This cleans up the add row function code nicely:
$('body').on("click",".addrow", function() {
var SelectedProject = "#Model.ProjectID";
var ProjectArray = createProjectArray();
var ProjectOptions = "";
ProjectOptions = SelectOptionsString(ProjectArray, SelectedProject);
var PeopleArray = createPeopleArray();
var PeopleOptions = "";
PeopleOptions = SelectOptionsString(PeopleArray, "");
var tr = '<tr class="alternate-row"><td><span> <select id="' +
ProjectID + '>' + ProjectOptions + '</select></span></td>' +
'<td><span> <select id="' + PeopleID + '>' + PeopleOptions +
'</select></span></td>' + '</tr>'
$("#myWebGrid tbody").append(tr);
});
And it also allows for some potential code reuse.

Current Alternative To .fontcolor() method in Javascript

I was given this task with some existing code to change the string color of each of three selector.value(s) that is output onto an input element to three different colors. The code boils the three selectors into a single output variable. Without destroying the code, I cannot figure out how to select each individual variables prior to condensing them.
If I could use the fontcolor() method, my life would be great but it's 2018 and I can't. Is there any way you can think of to solve this issue?To clarify, I need to alter the colors of the strings that belong to output(red), select1.value(blue) and select2.value(black.
Most of the action for this is happening in the parseOutput() function but I'm just stuck and don't think it's possible without rewriting the entire program.
function updateSelector(result){
var options = result.options;
var elementId = "select" + result.element;
var logger = document.getElementById('logger');
var selector = document.getElementById(elementId);
//logger.innerHTML = JSON.stringify(elementId);
selector.innerHTML = options;
selector.disabled = false;
}
google.script.run.withSuccessHandler(updateSelector).processOptions(0);
plate();
function resetAll(){
for (var i = 0;i<3;i++){
var selector = document.getElementById('select' + i);
selector.disabled = true;
selector.innerHTML = "";
}
google.script.run.withSuccessHandler(updateSelector).processOptions(0);
}
function finalSelection(){
var output = document.getElementById('out');
//output.focus();
output.select();
}
function plate(){
var plate = document.getElementById('plate');
plate.innerHTML = atob('Q3JhZnRlZCBieTogWmFjaGFyeSBTdGFjaG93aWFr');
}
//Adds the location as initial output, followed by divider, application, and issue if select1 is selected
//else statement added so if select0 is [Costco Website Name], to ommit the " - "
function parseOutput(){
var output = "";
if (select1.value.length > 0 && select0.value !== "[Costco Website Name]"){
output = output + ' - ' + select1.value + ' // ' + select2.value;
} else{
output = output + select1.value + ' // ' + select2.value;
}
out.value=output.trim();
}
And this is the Div that displays the output:
<div class="wide"><p><input class="wide" type="readonly" id="out" onfocus="this.select();"></p></div>

A modern replacement for fontcolor would use a span and a style (or class), e.g.:
function modernFontColor(str, color) {
return '<span style="color: ' + color + '">' + str + '</span>';
}
or
function modernFontClass(str, cls) {
return '<span class="' + cls + '">' + str + '</span>';
}
...where the class defines the styling.

Injecting elements and attaching Click event handlers in a loop with Javascript

I'm trying to make a dropdown which is populated from an array with Javascript. Each Item needs to have an event trigger attached, but it currently only attaches the event to the last element. I have tried the examples based on fixing closures but is still only attaches to the last element.
https://jsfiddle.net/z3h1uux4/
var ArrayUName = ["A","B","C"]
var ArraySlug = ["Q","W","E"]
for (i = 0; i < ArrayUName.length; i++) {
var GoalID = ArrayUName[i] + '-' + ArraySlug[i];
document.getElementById("TheContent").innerHTML +=
'<a class="GoalIDBtn" id="' + GoalID + '">' + ArrayUName[i] + ' / ' + ArraySlug[i] + '</a></br>';
(function(_i, _GoalID)
{document.getElementById(_GoalID).addEventListener(
"click",
function() {alert("Click Made : " + _i)}
);
})(i, GoalID);
console.log("Loop #" + i);
}

That's because innerHTML is a destructive property. It recreates the set content and creates new elements, the newly generated elements do no have any click handlers bound to them. You should create a node (element) instead of using innerHTML.
You can use the document.createElement and HTMLElement.appendChild methods instead:
var a = document.createElement('a');
a.className = 'GoalIDBtn';
a.id = GoalID;
a.textContent = ArrayUName[i] + ' / ' + ArraySlug[i];
document.getElementById("TheContent").appendChild(a);
(function(_i /*, _GoalID*/) {
a.addEventListener("click", function() {
alert("Click Made : " + _i);
});
})(i);
Here is a demo on jsfiddle. Note that it doesn't add the br elements and you can use the similar DOM APIs for creating them.

how to append a dispatchEvent containing data to a class with jquery

I'm having problems with my script and i can't see the problem with it myself:
$("#mainsub").append(newRow + "<div class='showMore' onclick='document.dispatchEvent(expand, { 'postId': " + pf.id + " })'>Show More</div></div>");
My webkit debugger is saying: "Uncaught SyntaxError: Unexpected token ;" when i click on the element.
has anyone run into this before? is there a problem with the line of code?
EDIT:** newRow looks like this:
var newRow = "<div id=" + pf.id + ">"+rowContents;
rowContents is:
rowContents += "<div class='"+tagName+"'>"+tag.text()+"</div>";
tag name is just from some xml i am parsing.
Another edit: I'm just going to put the whole function in just in case this is helpful
pf.parseResults = function(){
$("#mainsub").empty();
var $xml = $(pf.xml);
var $query = $xml.find('query_result').children().each(function() {
var row = $(this);
var rowContents = "";
row.children().each(function() {
var tag = $(this);
var tagName = tag[0].tagName;
if(tagName != "ID"){
rowContents += "<div class='"+tagName+"'>"+tag.text()+"</div>";
}
if(tagName === "ID"){
pf.id = tag.text();
}
});
var newRow = "<div id=" + pf.id + ">" + rowContents;
$("#mainsub").append(newRow + "<div class='showMore' onclick='document.dispatchEvent(expand, { \'postId\': " + pf.id + " })'>Show More</div></div>");// this fires an event with data attached listing the id of the element the user tapped/**/
});
$("#mainsub").append("<div onclick='document.dispatchEvent(nextPage)'><p>Next</p></div>");// figure out how to not show next when there will not be another page
if(pf.getPage > 0){
$("#mainsub").append("<div onclick='document.dispatchEvent(previousPage)'><p>Previous</p></div>");// show go to previous as long at it will exist
}
};

When you nest quotes of the same type (single quotes in your case) you have to escape them like this:
$("#mainsub").append(newRow + "<div class='showMore' onclick='document.dispatchEvent(expand, { \'postId\': " + pf.id + " })'>Show More</div></div>");
As this line of code is quite long and I didn't wand to change too much, I'll point out that escaped quotes are in this expand, { \'postId\': " + pf.id + " } fragment.

Using variable to add and remove a form input field with jQuery

I am trying to add a hidden input field to a form when a span with class="checkbox" is clicked, and remove that same field when span with checkmark is clicked.
I am able to add the input, but I cannot remove it.
My HTML:
<span title="Here's My Title" class="wishlistcheck checkbox">1</span>
<form id="wishlistform"></form>
My Javascript:
$(document).ready(function() {
var appNum = 0;
$("span.wishlistcheck").click(function() {
var el = $(this);
var appName = el.attr("title");
var isChecked = el.hasClass('checkmark');
if(!isChecked) {
el.removeClass('checkbox');
el.addClass('checkmark');
appNum++
$("#wishlistform").append("<input id=\"" + appName + "\" type=\"hidden\" name=\"product_" + appNum + "\" value=\"" + appName + "\">");
} else {
el.removeClass('checkmark');
el.addClass('checkbox');
appNum--
$("input#" + appName).remove();
}
});
});

I guess you have to put the appNum-- after the .remove() method calling. Try it:
$(document).ready(function() {
var appNum = 0;
$("span.wishlistcheck").click(function() {
var el = $(this);
var appName = el.attr("title");
var isChecked = el.hasClass('checkmark');
if(!isChecked) {
el.removeClass('checkbox');
el.addClass('checkmark');
appNum++
$("#wishlistform").append("<input class=\"" + appName + "\" type=\"hidden\" name=\"product_" + appNum + "\" value=\"" + appName + "\">");
} else {
el.removeClass('checkmark');
el.addClass('checkbox');
appNum--
$("input[class=" + appName + "]").remove();
}
});
});

You probably have multiple DOM elements by that id tag, and so it may be removing an element matching that id but not the right one.
Try giving it a class name instead and getting more specific in your jQuery parameters by adding parent elements, i.e.
$('#wishlistform input#' + appName).remove();