Exploring the jSignature feature in jQuery and Laravel models

I'm looking to retrieve the model (Offer) signature using jQuery. When I alert only the model, everything works fine.

alert( JSON.stringify(<?php echo $offer; ?>) );

However, when trying to access just the $offer->signature like this

alert( JSON.stringify(<?php echo $offer->signature; ?>) );

I encounter a SyntaxError in the console log:

SyntaxError: missing ) after argument list

Is there a way to extract that property from the model?

This is what the signature value looks like:

data:image/svg+xml,<?xml version="1.0" encoding="UTF-8" standalone="no"?><!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"><svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="273" height="111"><path stroke-linejoin="round" stroke-linecap="round" stroke-width="3" stroke="rgb(51, 51, 51)" fill="none" d="M 148 1 c -0.31 0 -13.32 -0.67 -18 0 c -1.1 0.16 -1.9 2.84 -3 3 c -4.68 0.67 -12.04 -0.25 -18 0 c -2.02 0.08 -4.15 0...

I am utilizing this jQuery plugin. I'm uncertain about how to retrieve the signature from the database. The command should ideally be:

$("#signature").jSignature("importData", dataurl);

However, on the page, it only functions if the dataurl is an image base30 format similar to this:

image/jsignature;base30,6RZ76663546536375366634210000Y2233424546656697536345453331Z734333321210Y14234653675991K53463542331215333666643333323132121_2u030120310212312333345456763353331231000000Z2213233342340Y233323343665432331210200Z91233343336545Y1323100Z232342436534654

Given that I possess an SVG type, perhaps converting it to base30 would allow for proper functionality?

jquerylaravel

Answer №1

Can you tell me the value of $offer->signature?

If it's a string, remember to include quotation marks as recommended by Alexey Menezin.

alert(JSON.strigify("<?php echo $offer->signature; ?>"));

This will result in:

alert(JSON.stringify("some string"));

However, if the JavaScript looks like this:

alert(JSON.stringify(some string));

An error will be thrown.

Answer №2

If you have a string or number in your property, give this a try:

console.log("<?php echo $offer->signature; ?>");

Alternatively, if you're using Blade:

console.log("{!! echo $offer->signature !!}");

It's not recommended to generate JS with PHP, so it's best to avoid it.

Answer №3

(Posted on behalf of the question author to transfer their answer to the response space).

After much trial and error, I was able to find a solution to the issue at hand. The key was adjusting the getData function in the signature section:

$("#canvas").jSignature("getData", "svg");

to this alternative:

$("#canvas").jSignature("getData");

This adjustment now allows me to retrieve a base64 PNG image that can be easily loaded into a basic 

<img src="data:image..." />
tag.

In order to fetch the signature from the database using jQuery, I incorporated the following code snippet:

@if (isset($offer->signature))
    $("#canvas").jSignature("importData", "{{$offer->signature}}");
@endif

To finalize the process, I included the base30 compressor .js library which enables me to save the signature in the database efficiently without it being too large, and easily load it back for editing purposes.

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