vue js 2 sorting a table - vue.js

Question

I have 2 questions with vue.js 2 and a fiddle here: https://jsfiddle.net/tmun9cxa/1/
When you click a column header, why does my sorting not work? What is the solution?
How do I go about making the search input field search only the pn column?
A lot of the examples ive found are using vue1 and out of date.
<input type="text" value="" v-model="search" placeholder="Search">
<table style="text-align: center;">
<thead>
<tr>
<th v-for="column in columns">
<a
href="#"
v-on:click="sort(column.shortcode)">{{column.label}}
</a>
</th>
</tr>
</thead>
<tbody>
<tr v-for="(product) in products">
<td>{{product.pn}}</td>
<td>{{product.od}}</td>
<td>{{product.id}}</td>
<td>{{product.thickness}}</td>
<td>{{product.lo}}</td>
<td>{{product.weight}}</td>
</tr>
</tbody>
</table>
javascript here
var vm = new Vue({
el: '#app',
data: {
currentSort: 'pn',
currentSortDir: 'asc',
search: '',
columns: [
{ label: 'P/N', shortcode: 'pn' },
{ label: 'OD (De,mm)', shortcode: 'od' },
{ label: 'ID (De,mm)', shortcode: 'id' },
{ label: 'Thickness (De,mm)', shortcode: 'thickness' },
{ label: 'LO', shortcode: 'lo' },
{ label: 'Weight (kg/1000)', shortcode: 'weight' },
], // columns
products: [
{
pn: 170158,
od: 13,
id: .44,
thickness: 1,
lo: .45,
weight: .7
},{
pn: 1803561,
od: 12,
id: .8,
thickness: .7,
lo: .11,
weight: .5
},{
pn: 170149,
od: 9,
id: .64,
thickness: .6,
lo: .75,
weight: .3
},{
pn: 150149,
od: 15,
id: .22,
thickness: .3,
lo: .55,
weight: .9
},
], // products
},
methods: {
sort:function(col) {
//console.log( 'current: '+this.currentSort );
//console.log( 'col: '+col );
//var colthing = col;
// if you click the same label twice
if(this.currentSort == col){
console.log( 'same col: '+col );
// sort by asc
this.products = this.products.sort((a, b) => {
return a.col >= b.col;
});
}else{
this.currentSort = col;
console.log( 'diff col: '+col );
// sort by desc
this.products = this.products.sort((a, b) => {
return a.col <= b.col;
});
} // end if
}, // sort
}, // methods
}); // vue

Answer 1

the column sorting , as pointed out, was not working because you need to use a[col] instead of a.col
Also, you should consider using a computed value instead of modifying the original data. This makes filtering easier too.
here is the updated script (note that <tr v-for="(product) in products"> needs to be <tr v-for="(product) in showProducts"> for this to work)
var vm = new Vue({
el: '#app',
data: {
currentSort: 'pn',
currentSortDir: 'asc',
search: '',
columns: [
{ label: 'P/N', shortcode: 'pn' },
/// more columns ...
], // columns
products: [
//.... objects
], // products
},
computed: {
showProducts() {
return this.products.filter(a => {
console.log(a.pn)
return (a.pn + '').includes(this.search)
})
.sort((a, b) => {
if (this.currentSortDir === 'asc') {
return a[this.currentSort] >= b[this.currentSort];
}
return a[this.currentSort] <= b[this.currentSort];
})
},
},
methods: {
sort:function(col) {
// if you click the same label twice
if(this.currentSort == col){
this.currentSortDir = this.currentSortDir === 'asc' ? 'desc' : 'asc';
}else{
this.currentSort = col;
console.log( 'diff col: '+col );
} // end if
}, // sort
}, // methods
}); // vue
finally, the fiddle: https://jsfiddle.net/tmun9cxa/2/