Web full stack ~ 17. Shopping cart case (JavaScript dynamic effect)

osc_ s7l03l2x 2021-01-21 10:28:58
web stack shopping cart case


Web The whole stack ~17. Shopping cart cases (JavaScript Dynamic effect )

Last issue

Preface

        The first three issues have finished drawing the style of shopping cart , So this issue will use JavaScript To achieve dynamic effects .

 Insert picture description here

Future generations

Ideas

        Can be in input In the label , Add click event , And pass on a this. This this It will input Pass on the past .

<li>
<input type="checkbox" id="all" onclick="cheAllFlag(this)"/> Future generations
</li>
function cheAllFlag(th){

// Judge whether it has been clicked 
var flag = th.checked;
alert(flag);
}

 Insert picture description here

        After confirming that the user clicks , Just add one to each box below name. Pay attention to this name You have to call them all by the same name . Then use for Just loop through it ~

function cheAllFlag(th){

// Judge whether the all box is checked 
var flag = th.checked;
// Get all the multiple choice boxes called fav The object of 
var fav = document.getElementsByName("fav");
//for Loop traversal , If the user clicks select all, then flag Namely true, Users don't click that much flag Namely false
for(var i in fav){

fav[i].checked = flag;
}
}

        At this time, it seems to be a success , But there's another BUG. That's it , If the user doesn't click Select all , It's about checking the items one by one , At this time, the select all button does not automatically tick . So at this time, you need to write a click event and put it in the label of the product details to judge ~

function checkFlag(){

// Select all by default 
var flag = true;
// Get all the multiple choice boxes called fav The object of 
var fav = document.getElementsByName("fav");
// Because the first and last boxes are all boxes , So avoid them when traversing 
for(var i = 1; i < fav.length - 1; i++){

// Judge whether all of them are checked , If one is not checked, you don't need to check all automatically 
if(!fav[i].checked){

// If you don't choose one, it means you don't choose all 
flag = false;
break;
}
}
// Assign the first and last boxes 
fav[0].checked = flag;
fav[fav.length - 1].checked = flag;
}

Quantity increase effect

        In the last issue of the drawing , Forget to think about that ... So here's an improvement . The numbers are in input Inside , It might be easier to modify .

<li>
<button onclick="add(this)">+</button>
<input type="text" style="width: 10px;" name="data" id="data" value="1"/>
<button>-</button>
</li>

 Insert picture description here

        It's also very simple , Just get it , Then add a click event to each of the plus and minus, and modify it ~

<li>
<button onclick="add(this)">+</button>
<input style="width: 10px;" value="1"/>
<button>-</button>
</li>
/*
increase
*/
function add(th){

// Get the next node object ( because Input stay add Below )
var nex = th.nextElementSibling;
// Change the node's value value 
nex.value = Number (nex.value) + 1;
}
/*
Reduce
*/
function reduce(th){

// Get the last node object ( because input stay reduce On top of )
var pre = th.previousElementSibling;
// Change the value of the node 
pre.value = Number(pre.value) - 1;
}

Settlement quantity

        The principle is the same as the addition and subtraction . It's just that the selected tag object has changed ~

// Get the unit price of each item 
var val = nex.parentNode.nextElementSibling.innerHTML;
// Calculate the total price 
var num = Number(val)*Number(nex.value);
// Assign the total price to the specified object 
nex.parentNode.nextElementSibling.innerHTML ="¥" + num;

Delete node

        This is the easiest one , Or direct transmission this Come here and remove that will do ~

// Delete the specified node 
function checkTest4(th){

// Get parent node div
var div=th.parentNode.parentNode.parentNode;
div.remove();
}
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