Develop Reference

Trying to hide/show partials based on if a input has text node.js handlebars

so I have a page. there's a search bar. if the search bar has no text inputted, the page displays two partials, one for featured apps and one for most popular. but if someone inputs any text at all into the search bar then the featured apps and most popular apps partials disappear and the search results partial shows up. instead what happens is neither partials load. there's just a big blank space where they should be.
I tried doing this with jQuery but was having no luck. so now I'm back to trying to use dynamic partials but am also having no luck with that. if this can only be done with something like jQuery please let me know.
I was briefly trying to use a handlebar helper but I could not link it to the input id="searchApps" element without throwing an error because it keeps saying searchApps is undefined.
index.hbs (if this is missing any divs it's cause it's just part of the code)
<div class="col-2 offset-1">
<div class="column-side">
<div class="sidebar">
<input id="searchApps" type="text" placeholder="Search apps...">
{{!-- so once someone types the first character here the searchResults partial should render. and it should be dynamic so results should further refine with each additional character typed--}}
{{>sidebar}}
</div>
</div>
</div>
{{#if 'searchApps.length === 0'}}
<div id="searchResultsHomePage">
<div class="col-7 offset-1">
{{>searchResults}}
</div>
</div>
{{else}}
<div id="homePageNoSearch">
<div class="col-7 offset-1">
{{>featuredApps}}
</div>
<div class="most-popular-grid">
{{>mostPopularApps}}
</div>
</div>
{{/if}}
here is the jQuery I tried in the index.hbs file just before the </body> tag
<script type="text/javascript">
$('#searchApps').on('change', function(){
if ($(this).val() == ""){
<div id="homePageNoSearch">
<div class="col-7 offset-1">
{{>featuredApps}}
</div>
<div class="most-popular-grid">
{{>mostPopularApps}}
</div>
</div>
} else {
<div id="searchResultsHomePage">
<div class="col-7 offset-1">
{{>searchResults}}
</div>
</div>
}
});
</script>
so anyone know how I can do this?
thanks

Hyperlink with relative url does not respond

OK so I am trying to build my own website using HTML templates and well i created a few additional pages of my own to incorporate to the template however and I linked them together well i thought i did and when i click the button linked to my created pages it does nothing it does not even refresh the page.
ill put a snippet of the part of the code i have problems with
<div class="col-lg-4 course_col">
<div class="course">
<div class="course_image"><img src="images/Physics.png" alt=""></div>
<div class="course_body">
<div class="course_title">Physics</div>
<div class="course_info">
<ul>
<li>Edward Nkadimeng</li>
<li>Grade 12</li>
</ul>
</div>
<div class="course_text">
<p>Physics Curriclum.</p>
</div>
</div>
</div>
</div>

Is there a way to track event when a particular part of page getting seen in browser?

For example:
<div class="div1">
<div class="div2">
</div>
<div class="div3">
</div>
<div class="div4">
</div>
<div class="div5">
</div>
...
</div>
Imaging that the blocks are big ones, and the browser view cannot hold all of them at the same time. Is there a way if I can get idea that a particular block get displayed and viewed by user?

Applying javascript to generated content

Being fairly new to Meteor, I'm stuck with an issue I encountered while generating input "on-the-fly" with a Helper. Indeed, what I'm trying to do is to generate a left labeled input with a dropdown but the problem is that I have to call the method $('.ui.dropdown').dropdown();
After creating each input with its corresponding dropdown, and I don't know how to do it properly with semantic-UI and Meteor environment.
Here is my helper creating the inputs:
'filterColumns': function() {
return Session.get('s_filterColumns');
}
Where 's_filterColumns' is an array looking like ["Firstname", "Lastname", "LivingPlace"]
And here is the HTML template using the helper to generate inputs:
<div id="fields">
<div class="ui grid">
{{#each filterColumns}}
<div class="eight wide column">
<label>{{this}}</label>
<div class="ui left labeled input">
<div class="ui dropdown label">
<div class="text">Start by</div>
<i class="dropdown icon"></i>
<div class="menu">
<div class="item">Start by</div>
<div class="item">Contains</div>
<div class="item">End by</div>
</div>
</div>
<input type="text">
</div>
</div>
{{/each}}
</div>
</div>
But then, when populating the session variable with new content, the inputs are being created accordingly but the javascript dropdown method is not called again and so my left label is not a dropdown.
If you have any recommendations regarding anything in my conception I'd be glad to learn from someone more experienced than me.

If you are unsure when to call $('.ui.dropdown').dropdown(), try running it inside Template.myTemplate.onRendered() where myTemplate is the name of your template. Given that you have multiple dropdowns though you might want to put the html that's inside your {{#each }} into its own template and use that for onRendered().
Note: Community Wiki answer created because question was answered by Michel Floyd in the comments.

Converting from working function in console to working script. (See Edit)

I'm trying to automate a clicking of a link within a class list. Currently I have a working script that will pick the first item in the container using the querySelector(), one line of code wrapped in a function.
To have more usability, I was wondering if I could modify the code so that the script searches within each item in the container trying to match a title of the listing or name with a defined variable, to the users desire, and once found, clicks the link for that particular item.
<div class="item-wall">
<div class="grid-item" data-column-index="0" data-pdpurl="http://www.LINK1.com">
<div class="grid-item"> … </div>
<div class="content">
<div class="grid-item-details-wrapper">
<div class="grid-item-image"> … </div>
<div class="grid-item-info-wrapper no-chipper">
<a href="http://www.LINK1.com">
<div class="product-name">
<p class="griditem-display-name nsg-font-size--regular nsg-text--dark-grey">
PRODUCT1
</p>
<p class="griditem-subtitle nsg-font-size--regular nsg-text--medium-grey"> … </p>
</div>
<div class="product-price-wrapper"> … </div>
</a>
</div>
<div class="grid-item-extras"> … </div>
</div>
</div>
</div>
<div class="grid-item" data-column-index="1" data-pdpurl="http://www.LINK2.com">
<div class="grid-item"> … </div>
<div class="content">
<div class="grid-item-details-wrapper">
<div class="grid-item-image"> … </div>
<div class="grid-item-info-wrapper no-chipper">
<a href="http://www.LINK2.com">
<div class="product-name">
<p class="griditem-display-name nsg-font-size--regular nsg-text--dark-grey">
PRODUCT2
</p>
<p class="griditem-subtitle nsg-font-size--regular nsg-text--medium-grey"> … </p>
</div>
<div class="product-price-wrapper"> … </div>
</a>
</div>
<div class="grid-item-extras"> … </div>
</div>
</div>
</div>
<div class="paging-bar hidden"> … </div>
<div class="spacer"></div>
</div>
Sorry for being so verbose. The web page has an 'item-wall' with several items, 2 are only shown here. I wish to be able to set a variable as a string in the script and be able to use something along the lines of .contain() to find an instance of the matching product name in the wall and then have it open the link corresponding to the selection.
Thanks for any input!
/////////////////////////////////////////////////////////////////////////////////////////////
EDIT: Thanks to #Barmar for the working console function:
function product_click(product) {
$(".griditem-display-name:contains("+product+")").closest("a").click();
}
product_click("Desirable here")
Now I am at a loss as to how to make this function operational in an script. I've tried with scriptish in firefox and have tried writing this to a .js file and loading it as an unpacked extension in chrome to no avail. It seems as though the function/script won't load. If anyone has any thoughts, they'd be greatly appreciated.
Thanks again!

If I understand you correctly, I think this is it:
function product_click(product) {
$(".griditem-display-name:contains("+product+")").closest("a").click();
}